LG UltraGear Auto-Dimming Fix | Stop Screen Dimming on Gaming Monitors

LG UltraGear Auto-Dimming Fix | Stop Screen Dimming on Gaming Monitors

💡 Quick Start: Download lg-ultragear-dimming-fix.exe, run it, and the interactive menu takes care of the rest.

Fix LG UltraGear Monitor Auto-Dimming Problems

lg-ultragear-dimming-fix is a single native Windows binary that stops auto-dimming on LG UltraGear LCD monitors. It installs a calibrated ICC color profile, detects your monitors via WMI, and can run as a Windows service to automatically reapply the fix whenever displays reconnect, the session unlocks, or the system wakes from sleep.

No PowerShell. No scripts. No dependencies. Just one .exe.

What This Tool Does

Purpose: Stop LG UltraGear gaming monitors from dimming under static or semi-static content by constraining the panel's effective luminance range.
Method: Apply and set a custom ICC/ICM color profile that limits the tone response so the monitor's firmware auto-dimming heuristic doesn't trigger.
Persistence: A Windows service monitors display-connect, session-unlock, and logon events and reapplies the profile automatically — surviving reconnects, sleep/wake, and reboots.
Platform: Windows 10/11 — native Win32/WinRT APIs, no runtime dependencies.
Compatible Models: Works with most LG UltraGear series monitors including 27GL850, 27GN950, 38GN950, 34GN850, and many others experiencing unexpected dimming.

Common Problems This Fixes

✅ Screen dims when displaying bright or white content
✅ Monitor brightness fluctuates during gaming sessions
✅ Unexpected darkening with static images or productivity apps
✅ ABL (Automatic Brightness Limiting) cannot be disabled in OSD
✅ Brightness inconsistency affecting competitive gaming
✅ Eye strain from constant brightness changes
✅ Profile resets after monitor reconnection, sleep, or reboot

Why This Works

Many LG UltraGear models use firmware-level auto-dimming (ABL — Automatic Brightness Limiting) that activates when:

Average Picture Level (APL) stays high
Content appears static or semi-static
Bright colors dominate the screen

This dimming behavior is frustrating for gamers and professionals because:

It reduces visibility in competitive gaming
Creates inconsistent viewing experience
Cannot be disabled through monitor OSD settings
Persists even with power-saving options disabled

The solution uses a custom ICC color profile that constrains the effective luminance range Windows sends to the display. By limiting the tone response curve, the monitor's firmware never reaches the threshold that triggers auto-dimming, maintaining consistent brightness.

Software-Only Fix — No Hardware Modifications

Nothing on the monitor is flashed or permanently changed
You can revert at any time by removing the color profile
Works immediately without firmware updates
Safe for your monitor warranty

Why Other Solutions Don't Work

❌ Disabling OSD power-saving options — Often does not fully disable firmware-level dimming on UltraGear models
❌ Windows/GPU settings changes — Disabling adaptive brightness, CABC, or toggling HDR commonly fails to stop firmware behavior
❌ Waiting for firmware updates — Many screens either have no user-accessible updates, or LG hasn't released fixes
✅ Color profile approach — Works immediately with current firmware, no waiting required

LG Service Menu — Disable CPC / LEA Refresh (OLED Models)

Some LG UltraGear OLED monitors (confirmed on 27GR95QE, 32GS95UE, 32GS95UX) have a hidden service menu that lets you disable CPC (Content-based Power Control) and LEA Refresh for higher sustained brightness. This is a complementary approach that can be combined with the color profile fix above.

Note: Service menu settings reset every time the monitor is fully powered off. See the deep sleep workaround below to preserve them across sleep cycles.

How to enter the service menu (no remote required):

Power off the monitor
Push the joystick/thumbstick: Left → Left → Left → Right
Power on the monitor
Open the OSD settings — you will see the service menu instead of the normal menu

Recommended settings:

Turn Aging → On (this unlocks the OLED debug/tuning options)
Disable CPC (Content-based Power Control) — prevents automatic brightness reduction based on screen content
Disable LEA Refresh — prevents periodic brightness dips from the panel refresh cycle
Turn Aging → Off when done, so the automatic image cleaning (pixel refresh) process remains enabled

Tip: If the CPC / LEA Refresh options are not visible, try enabling Aging first — that may be all that's needed on your model.

How to exit the service menu:

Repeat the same joystick sequence: power off → Left → Left → Left → Right → power on → open OSD. The normal settings menu will return.

Preserving settings across sleep cycles:

Disable Deep Sleep in the normal OSD before entering the service menu. The changed values will persist as long as the monitor is not fully powered off (standby/sleep is fine). Note: you must stay in "service menu mode" — switching back to the normal OSD requires the power-off sequence, which resets the service menu values.

Thanks to the r/OLED_Gaming community and user La773 for documenting these steps.

Quick Start

Download and Run

Download lg-ultragear-dimming-fix.exe from the latest release
Run it (a UAC prompt will appear — admin is required for color profile and service installation)
The interactive TUI opens automatically — press 1 for a full install (profile + service)

That's it. The service handles persistence from here.

Interactive TUI

When run without arguments, the tool opens an interactive terminal menu:

╔════════════════════════════════════════════════════════════════════════════╗
║                    LG UltraGear Auto-Dimming Fix                           ║
╟────────────────────────────────────────────────────────────────────────────╢
║  Status: Profile ✓  Service ✓  Running ✓  Monitors: 1                     ║
╟────────────────────────────────────────────────────────────────────────────╢
║  1. Install (profile + service)     6. Detect monitors                     ║
║  2. Install profile only            7. Remove service                      ║
║  3. Install service only            8. Remove profile                      ║
║  4. Refresh / reapply profile       9. Full uninstall                      ║
║  5. Reinstall everything            A. Advanced options                    ║
║                                     Q. Quit                                ║
╚════════════════════════════════════════════════════════════════════════════╝

Advanced options let you toggle toast notifications, dry-run mode, and verbose output.

You can open DDC/CI Studio directly from the main menu with [D] (or from Maintenance via [N]). It lets you read/write DDC/CI VCP codes targeting your LG UltraGear monitor — including brightness, color presets, display modes, resets, and custom VCP codes.

CLI Mode

For scripting, automation, or headless environments, use subcommands directly:

# Install profile + service (detects LG UltraGear monitors automatically)
lg-ultragear-dimming-fix.exe install

# Install profile only, no service
lg-ultragear-dimming-fix.exe install --profile-only

# Install service only
lg-ultragear-dimming-fix.exe install --service-only

# Force overwrite with custom profile path
lg-ultragear-dimming-fix.exe install --force --profile-path "C:\my-profile.icm"

# Dry-run install (simulate without changes)
lg-ultragear-dimming-fix.exe --dry-run install

# Detect monitors matching a pattern
lg-ultragear-dimming-fix.exe detect
lg-ultragear-dimming-fix.exe detect --pattern "LG"
lg-ultragear-dimming-fix.exe detect --pattern "27G.*850" --regex

# One-shot profile reapply
lg-ultragear-dimming-fix.exe apply

# Run event watcher in foreground (Ctrl+C to stop)
lg-ultragear-dimming-fix.exe watch

# Probe status (monitors, profile, service, config)
lg-ultragear-dimming-fix.exe probe

# Uninstall service
lg-ultragear-dimming-fix.exe uninstall

# Full uninstall (service + profile + config)
lg-ultragear-dimming-fix.exe uninstall --full

# Reinstall everything
lg-ultragear-dimming-fix.exe reinstall

# View / manage configuration
lg-ultragear-dimming-fix.exe config show
lg-ultragear-dimming-fix.exe config path
lg-ultragear-dimming-fix.exe config reset

# Diagnostics
lg-ultragear-dimming-fix.exe test toast
lg-ultragear-dimming-fix.exe test toast --title "Hello" --body "Custom message"
lg-ultragear-dimming-fix.exe test profile
lg-ultragear-dimming-fix.exe test monitors

# Windows service control (advanced)
lg-ultragear-dimming-fix.exe service install
lg-ultragear-dimming-fix.exe service install --service-name my-custom-svc
lg-ultragear-dimming-fix.exe service start
lg-ultragear-dimming-fix.exe service stop
lg-ultragear-dimming-fix.exe service status
lg-ultragear-dimming-fix.exe service uninstall

# DDC/CI monitor control
lg-ultragear-dimming-fix.exe ddc list
lg-ultragear-dimming-fix.exe ddc brightness 50
lg-ultragear-dimming-fix.exe ddc brightness 75 --pattern "LG"
lg-ultragear-dimming-fix.exe ddc color-preset
lg-ultragear-dimming-fix.exe ddc set-color-preset 6
lg-ultragear-dimming-fix.exe ddc display-mode
lg-ultragear-dimming-fix.exe ddc set-display-mode 3
lg-ultragear-dimming-fix.exe ddc reset-brightness-contrast
lg-ultragear-dimming-fix.exe ddc reset-color
lg-ultragear-dimming-fix.exe ddc version
lg-ultragear-dimming-fix.exe ddc get-vcp 10
lg-ultragear-dimming-fix.exe ddc set-vcp 10 50

CLI Reference

Global Flags

Flag	Short	Description
`--verbose`	`-v`	Enable verbose output
`--dry-run`		Simulate operations without making changes
`--non-interactive`		Force CLI mode (skip TUI even if a terminal is attached)
`--skip-elevation`		Do not auto-elevate to administrator
`--help`	`-h`	Show help
`--version`	`-V`	Show version

Commands

Install / Uninstall / Reinstall

Command	Flags	Description
`install`		Install color profile and/or service
	`--pattern <TEXT>` `-p`	Monitor name pattern (case-insensitive substring match)
	`--regex`	Use regex pattern matching instead of substring
	`--profile-only`	Install ICC profile only (no service)
	`--service-only`	Install service only (skip profile extraction)
	`--profile-path <PATH>`	Path to a custom ICC/ICM profile (dynamic CMX profile by default)
	`--per-user`	Also associate profile in per-user scope (default: system-wide)
	`--skip-hdr`	Skip HDR/advanced-color association
	`--skip-hash-check`	Skip hash check — always overwrite profile in color store
	`--force`	Force overwrite even if profile and service already exist
	`--skip-detect`	Skip monitor detection during install
`uninstall`		Uninstall service
	`--full`	Remove everything (service + profile + config)
	`--profile`	Also remove the ICC profile from the color store
`reinstall`		Clean reinstall (uninstall then install)
	`--pattern <TEXT>` `-p`	Monitor name pattern override
	`--regex`	Use regex pattern matching instead of substring

Monitor & Profile

Command	Flags	Description
`detect`		Detect connected monitors matching a pattern
	`--pattern <TEXT>` `-p`	Monitor name pattern (case-insensitive substring match)
	`--regex`	Use regex pattern matching instead of substring
`apply`		One-shot profile reapply for matching monitors
	`--pattern <TEXT>` `-p`	Monitor name pattern override
	`--regex`	Use regex pattern matching instead of substring
	`--profile-path <PATH>`	Path to a custom ICC/ICM profile
	`--per-user`	Also associate profile in per-user scope
	`--skip-hdr`	Skip HDR/advanced-color association
	`--toast`	Enable toast notification for this run
	`--no-toast`	Disable toast notification for this run
`watch`		Run event watcher in foreground (Ctrl+C to stop)
	`--pattern <TEXT>` `-p`	Monitor name pattern override
	`--regex`	Use regex pattern matching instead of substring
`probe`		Probe monitors, profile, service, and config status
	`--pattern <TEXT>` `-p`	Monitor name pattern
	`--regex`	Use regex pattern matching instead of substring

Diagnostics

Command	Flags	Description
`test toast`		Send a test toast notification
	`--title <TEXT>`	Custom title (default: "LG UltraGear Test")
	`--body <TEXT>`	Custom body (default: "Toast notification is working ✓")
`test profile`		Verify ICC profile integrity (hash check)
`test monitors`		Test monitor detection
	`--pattern <TEXT>` `-p`	Monitor name pattern
	`--regex`	Use regex pattern matching instead of substring

Configuration

Command	Flags	Description
`config show`		Show current configuration
`config path`		Print config file path
`config reset`		Reset config to defaults

Service Management

Command	Flags	Description
`service install`		Install the Windows service
	`--pattern <TEXT>` `-p`	Monitor name pattern
	`--service-name <NAME>`	Custom service name (default: lg-ultragear-color-svc)
`service uninstall`		Uninstall the Windows service
`service start`		Start the service
`service stop`		Stop the service
`service status`		Show service status

DDC/CI Monitor Control

All ddc commands default to the configured monitor_match pattern (e.g. "LG ULTRAGEAR"). Use --pattern to override.

Command	Flags	Description
`ddc list`		List all physical monitors visible via DDC/CI
`ddc brightness <VALUE>`		Set brightness (0–100) on all monitors
	`--pattern <TEXT>` `-p`	Target a specific monitor
`ddc color-preset`		Read current color preset (VCP 0x14)
	`--pattern <TEXT>` `-p`	Monitor pattern
`ddc set-color-preset <VALUE>`		Set color preset (1=sRGB, 6=6500K, 10=9300K, 11=User1…)
	`--pattern <TEXT>` `-p`	Monitor pattern
`ddc display-mode`		Read current display/picture mode (VCP 0xDC)
	`--pattern <TEXT>` `-p`	Monitor pattern
`ddc set-display-mode <VALUE>`		Set display mode
	`--pattern <TEXT>` `-p`	Monitor pattern
`ddc reset-brightness-contrast`		Reset brightness + contrast to factory (VCP 0x06)
	`--pattern <TEXT>` `-p`	Monitor pattern
`ddc reset-color`		Reset color to factory defaults (VCP 0x0A)
	`--pattern <TEXT>` `-p`	Monitor pattern
`ddc version`		Read VCP/MCCS version (VCP 0xDF)
	`--pattern <TEXT>` `-p`	Monitor pattern
`ddc get-vcp <CODE>`		Read any VCP code (hex, e.g. `10`, `14`, `DC`)
	`--pattern <TEXT>` `-p`	Monitor pattern
`ddc set-vcp <CODE> <VALUE>`		Write any VCP code (hex) — use with caution
	`--pattern <TEXT>` `-p`	Monitor pattern

Manual Install (No Tool)

If you prefer not to run any executables, you can apply the profile manually:

Generate/export your preferred .icm profile or use the built-in dynamic generator
Copy it to %WINDIR%\System32\spool\drivers\color (requires admin)
Press Win+R, type colorcpl, press Enter
Go to the Devices tab, select your LG UltraGear monitor
Check "Use my settings for this device"
Click Add…, browse to the .icm file, select it
Click Set as Default Profile

⚠️ This manual method does not persist across reconnections. Use the tool with the service for automatic reapplication.

How It Works (Technical)

Architecture

The tool is built as a Rust workspace with six crates:

Crate	Purpose
lg-cli	CLI entry point (clap) + interactive TUI (crossterm)
lg-core	Shared configuration (TOML-based, stored in `%ProgramData%`)
lg-monitor	WMI monitor discovery + DDC/CI control (`dxva2.dll`)
lg-profile	ICC profile management via Windows Color System (`mscms.dll`)
lg-notify	Toast notifications via WinRT (`ToastNotificationManager`)
lg-service	Windows service runtime (SCM, device notifications, session events)

Profile Installation

The ICC profile is generated dynamically in Rust via cmx at runtime (no embedded .icm blob)
On install, the profile is extracted to %WINDIR%\System32\spool\drivers\color
Profile is associated with matching display device keys via WcsAssociateColorProfileWithDevice / WcsDisassociateColorProfileFromDevice
Display settings are refreshed and the Calibration Loader task is triggered via COM Task Scheduler

Monitor Detection

Uses WMI WmiMonitorId to enumerate connected displays
Matches by user-friendly name (case-insensitive substring, default: "LG ULTRAGEAR")
Override with --pattern flag or monitor_match in config

DDC/CI Monitor Control

Uses the Windows Monitor Configuration API (dxva2.dll) for low-level DDC/CI communication
Reads and writes MCCS VCP codes (brightness, contrast, color preset, display mode, etc.)
Monitor targeting works by matching the DDC physical monitor description or the GDI device string against the configured monitor_match pattern — this correctly identifies LG monitors even when they appear as "Generic PnP Monitor" in dxva2
Supports factory reset commands (brightness/contrast reset, color reset) via VCP codes 0x06 and 0x0A
Auto-set brightness on profile reapply can be enabled via ddc_brightness_on_reapply in config

Service Mode

The Windows service (lg-ultragear-color-svc) listens for:

Device interface notifications (DBT_DEVICEARRIVAL / DBT_DEVICEREMOVECOMPLETE) — monitor connect/disconnect
Session change events (WTS_SESSION_UNLOCK, WTS_SESSION_LOGON) — session unlock, logon
Display change messages (WM_DISPLAYCHANGE) — resolution/display topology changes

Events are debounced and trigger a profile reapply cycle: disassociate → reassociate → refresh → trigger Calibration Loader.

Configuration

Configuration is stored at %ProgramData%\LG-UltraGear-Monitor\config.toml:

monitor_match = "LG ULTRAGEAR"
monitor_match_regex = false
profile_name = "lg-ultragear-dynamic-cmx.icm" # used when icc_active_preset = "custom"
icc_gamma = 2.05
icc_active_preset = "gamma22" # gamma22 | gamma24 | reader | custom
icc_generate_specialized_profiles = true
icc_luminance_cd_m2 = 120.0
icc_tuning_preset = "anti_dim_balanced" # manual | anti_dim_soft | anti_dim_balanced | anti_dim_aggressive | anti_dim_night | reader_balanced | color_rgb_full | color_rgb_limited | color_ycbcr444 | color_ycbcr422 | color_ycbcr420 | color_bt2020_pq | unyellow_soft | unyellow_balanced | unyellow_aggressive | black_depth | white_clarity | anti_fade_punch | anti_fade_cinematic
icc_tuning_overlay_manual = true
icc_black_lift = 0.0
icc_midtone_boost = 0.0
icc_white_compression = 0.0
icc_gamma_r = 1.0
icc_gamma_g = 1.0
icc_gamma_b = 1.0
icc_vcgt_enabled = false
icc_vcgt_strength = 0.0
icc_target_black_cd_m2 = 0.2
icc_include_media_black_point = true
icc_include_device_descriptions = true
icc_include_characterization_target = true
icc_include_viewing_cond_desc = true
icc_technology_signature = "vidm"
icc_ciis_signature = ""
icc_cicp_enabled = false
icc_cicp_primaries = 1
icc_cicp_transfer = 13
icc_cicp_matrix = 0
icc_cicp_full_range = true
icc_metadata_enabled = false
icc_include_calibration_datetime = true
icc_include_chromatic_adaptation = true
icc_include_chromaticity = true
icc_include_measurement = true
icc_include_viewing_conditions = true
icc_include_spectral_scaffold = false
icc_per_monitor_profiles = true
icc_hdr_preset = "gamma22"
icc_sdr_preset = "gamma22"
icc_schedule_day_preset = ""
icc_schedule_night_preset = ""
verbose = false
toast_enabled = true
toast_title = "LG UltraGear"
toast_body = "Color profile reapplied ✓"
refresh_display_settings = false
refresh_broadcast_color = true
refresh_invalidate = false
refresh_calibration_loader = true
stabilize_delay_ms = 1500
toggle_delay_ms = 100
reapply_delay_ms = 12000
ddc_brightness_on_reapply = false
ddc_brightness_value = 50

In TUI mode, open ICC Studio from the main menu with I to edit/save all ICC tuning/tag settings and generate/apply an optimized ICC on the fly.

Preset System (Current Behavior)

The tool resolves two independent preset layers:

ICC profile preset (icc_active_preset): gamma22, gamma24, reader, custom
Tuning preset (icc_tuning_preset): controls curve shaping, color balance, and optional signaling/tag behavior

Tuning preset families:

Anti-dim: anti_dim_soft, anti_dim_balanced, anti_dim_aggressive, anti_dim_night
Reader/unyellow: reader_balanced, unyellow_soft, unyellow_balanced, unyellow_aggressive
Color-space style: color_rgb_full, color_rgb_limited, color_ycbcr444, color_ycbcr422, color_ycbcr420, color_bt2020_pq
Contrast/tonal: black_depth, white_clarity, anti_fade_punch, anti_fade_cinematic
Manual raw controls: manual

Per-run preset resolution order:

Day/night schedule (icc_schedule_day_preset + icc_schedule_night_preset) if both are set.
Mode preset (icc_sdr_preset or icc_hdr_preset).
Fallback to icc_active_preset.

If icc_tuning_overlay_manual = true, changed manual icc_* tuning fields overlay on top of the selected tuning preset.

ICC Utilities

The CLI includes ICC conversion/inspection/manipulation tools:

# Generate ICC from TOML config
lg-ultragear-dimming-fix.exe icc from-toml --input config.toml --output out.icm

# Generate optimized ICC from preset tuning and apply immediately
lg-ultragear-dimming-fix.exe icc optimize --tuning-preset anti_dim_balanced --apply --save-config

# Reader-focused preset (unyellow white balance + brighter text/background perception)
lg-ultragear-dimming-fix.exe icc optimize --tuning-preset reader_balanced --luminance 160 --apply --save-config

# YCbCr 4:4:4 style tuning preset
lg-ultragear-dimming-fix.exe icc optimize --tuning-preset color_ycbcr444 --apply --save-config

# Strong yellow-cast reduction preset
lg-ultragear-dimming-fix.exe icc optimize --tuning-preset unyellow_aggressive --apply --save-config

# Recover washed/faded look preset
lg-ultragear-dimming-fix.exe icc optimize --tuning-preset anti_fade_punch --apply --save-config

# Validate an ICC
lg-ultragear-dimming-fix.exe icc validate --input out.icm
lg-ultragear-dimming-fix.exe icc validate --input out.icm --detailed

# Inspect tags
lg-ultragear-dimming-fix.exe icc inspect --input out.icm
lg-ultragear-dimming-fix.exe icc inspect --input out.icm --detailed

# Normalize/rewrite profile
lg-ultragear-dimming-fix.exe icc normalize --input in.icm --output normalized.icm

# Set/remove raw tags
lg-ultragear-dimming-fix.exe icc set-tag --input in.icm --output out.icm --signature tech --type-signature sig --payload-text "vidm"
lg-ultragear-dimming-fix.exe icc remove-tag --input out.icm --output out2.icm --signature meta

# Import i1Profiler-exported profile (validate + normalize)
lg-ultragear-dimming-fix.exe icc import-i1 --input xrite.icc

File Locations

Item	Path
Binary	`%ProgramData%\LG-UltraGear-Monitor\lg-ultragear-dimming-fix.exe`
Config	`%ProgramData%\LG-UltraGear-Monitor\config.toml`
Profile (active, default)	`%WINDIR%\System32\spool\drivers\color\lg-ultragear-gamma22-cmx.icm`
Profile (specialized)	`%WINDIR%\System32\spool\drivers\color\lg-ultragear-gamma24-cmx.icm`
Profile (reader preset)	`%WINDIR%\System32\spool\drivers\color\lg-ultragear-reader-cmx.icm`

Security / Permissions

Installing into the system color store and registering a Windows service requires administrator privileges
A UAC prompt will appear when the tool needs elevation
The service runs as LocalSystem for access to the color store and device notifications
No network access, no telemetry, no external dependencies

Verification

Color Management UI: Press Win+R, run colorcpl → Devices tab → select your LG UltraGear → confirm lg-ultragear-gamma22-cmx.icm (or selected preset) is present and set as default
Service status: Run lg-ultragear-dimming-fix.exe service status or check in services.msc
Visual check: Leave a bright, mostly static window open — dimming should be gone or greatly reduced
Monitor detection: Run lg-ultragear-dimming-fix.exe detect to see matched displays

Troubleshooting

The profile resets after reconnection or sleep

Install the service: run the tool and press 1 (Install profile + service), or use lg-ultragear-dimming-fix.exe install
Verify the service is running: lg-ultragear-dimming-fix.exe service status

The profile is applied but dimming still occurs

Some LG UltraGear models have multiple dimming mechanisms
Disable "Energy Saving" or "Smart Energy Saving" in the monitor's OSD menu
Ensure HDR is disabled in Windows settings if you're using SDR content
Some models have more aggressive ABL that requires additional OSD tuning

Screen dims only on certain colors or scenes

The profile prevents aggressive dimming but may not eliminate all firmware-level ABL
Try adjusting monitor brightness and contrast in OSD
Some models have more aggressive ABL than others

Gaming performance concerns

This fix does not impact gaming performance or FPS
Works alongside G-SYNC, FreeSync, and other monitor features
No input lag or response time changes

Install / Uninstall / Reinstall fails with "access denied" or file-lock errors

Close Event Viewer (and any other MMC snap-in) before running install, uninstall, or reinstall. Event Viewer holds open handles to the service's event log, which can prevent Windows from removing or replacing the service binary.
Run the tool from an elevated (Administrator) terminal.

Completely uninstall everything

lg-ultragear-dimming-fix.exe uninstall --full

This removes the service, the ICC profile from the color store, and the config file.

Rollback / revert (manual)

colorcpl → Devices → select display → choose another default or uncheck "Use my settings for this device"
Delete the profile from %WINDIR%\System32\spool\drivers\color (admin required)

Building from Source

Prerequisites

Rust toolchain (stable)
Windows 10/11 SDK (for Win32/WinRT bindings)

Build

# Debug build
cargo build

# Release build (optimized, LTO, stripped)
cargo build --release

# Run tests (580+ tests across all crates)
cargo test --all-targets

# Format check
cargo fmt --all -- --check

# Lint
cargo clippy --all-targets --all-features -- -D warnings

The release binary is at target\release\lg-ultragear-dimming-fix.exe.

Project Structure

crates/
  lg-cli/        CLI entry point + interactive TUI
  lg-core/       Configuration management (TOML)
  lg-monitor/    WMI monitor detection + DDC/CI control
  lg-profile/    ICC profile + WCS APIs
  lg-notify/     WinRT toast notifications
  lg-service/    Windows service runtime
legacy/          Original PowerShell/batch installer (archived)
docs/            Additional guides

Downloads & Releases

Pushes to main/master run the main CI workflow, which automatically:

bumps VERSION (increments the last numeric segment),
commits and tags the new version, and
publishes a GitHub Release with packaged artifacts.

Each release includes:

lg-ultragear-dimming-fix.exe — standalone native binary (everything included)
lg-ultragear-dimming-fix.zip — binary + ICM profile + readme + license

License

See license.md for licensing details.

FAQ

Does this work with all LG UltraGear monitors?

Tested and confirmed on many models including 27GL850, 27GL83A, 27GN950, 27GN850, 27GN800, 34GN850, 38GN950, 32GN650, 32GP850, and others. If your model isn't listed, try it — the fix is safe and reversible.

Will this affect color accuracy?

The profile constrains the luminance range slightly to prevent dimming triggers. Most users report no noticeable color difference in normal use. For professional color-critical work, you may want to revert the profile.

Does this work with HDR content?

This fix primarily targets SDR content. HDR behavior varies by model.

Can I use this with NVIDIA or AMD graphics cards?

Yes. The fix operates at the Windows Color System level, independent of GPU vendor or driver.

Will this void my monitor warranty?

No. This is a software-only fix that does not modify firmware or hardware.

What's the difference between "watch" and the service?

watch runs the event watcher in the foreground (Ctrl+C to stop). The service runs in the background permanently, starting automatically with Windows.

Can I uninstall this easily?

Yes. Run lg-ultragear-dimming-fix.exe uninstall --full to remove everything (service, profile, config).

Credits

We used to use StuffAround color profile, but not any more.

The old LG 27GS60QC-B Color Profile was created by StuffAround.

Their original repo: https://github.com/StuffAround/LG_27GS60QC-B_AutodimmingFix

Keywords

LG UltraGear dimming fix, LG monitor auto dimming, LG UltraGear brightness problem, stop LG monitor from dimming, LG ABL disable, LG automatic brightness limiting, gaming monitor dimming issue, LG 27GL850 dimming, LG 27GN950 dimming, LG UltraGear screen darkening, fix monitor brightness fluctuation, LG gaming monitor dimming Windows 10, LG gaming monitor dimming Windows 11, disable ABL LG UltraGear, ICC profile fix dimming, color profile dimming solution

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crates		crates
docs		docs
legacy		legacy
scripts		scripts
.gitattributes		.gitattributes
.gitignore		.gitignore
Cargo.lock		Cargo.lock
Cargo.toml		Cargo.toml
VERSION		VERSION
license.md		license.md
readme.md		readme.md

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LG UltraGear Auto-Dimming Fix | Stop Screen Dimming on Gaming Monitors

Fix LG UltraGear Monitor Auto-Dimming Problems

What This Tool Does

Common Problems This Fixes

Why This Works

Software-Only Fix — No Hardware Modifications

Why Other Solutions Don't Work

LG Service Menu — Disable CPC / LEA Refresh (OLED Models)

Quick Start

Download and Run

Interactive TUI

CLI Mode

CLI Reference

Global Flags

Commands

Manual Install (No Tool)

How It Works (Technical)

Architecture

Profile Installation

Monitor Detection

DDC/CI Monitor Control

Service Mode

Configuration

Preset System (Current Behavior)

ICC Utilities

File Locations

Security / Permissions

Verification

Troubleshooting

The profile resets after reconnection or sleep

The profile is applied but dimming still occurs

Screen dims only on certain colors or scenes

Gaming performance concerns

Install / Uninstall / Reinstall fails with "access denied" or file-lock errors

Completely uninstall everything

Rollback / revert (manual)

Building from Source

Prerequisites

Build

Project Structure

Downloads & Releases

License

FAQ

Does this work with all LG UltraGear monitors?

Will this affect color accuracy?

Does this work with HDR content?

Can I use this with NVIDIA or AMD graphics cards?

Will this void my monitor warranty?

What's the difference between "watch" and the service?

Can I uninstall this easily?

Credits

Keywords

About

Topics

Resources

License

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Watchers

Forks

Releases 2

Sponsor this project

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Contributors 2

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