External Display via USB4 flickering (horizontal shifting)

[p-sims]

Describe the bug

I have ThinkPad USB4 Dock connected to Framework Laptop, with two Apple Cinema Displays connected to dock:

With just 27" display connect all is good.
With 24" connected as well (with 27" being primary), the 24" display always flickers (horizontal shifting) when it's first turns on. Mostly changing screen resolution to something else and then back again seems to cause it to settle down, but sometimes it comes back after a while.

What did you expect to happen?

Both monitors should give stable video output when computer is booted/wakes up from suspend.

Output of bootc status

Staged ostree
         Commit: bed857edb983f772852ea33936e5ef5534fd508cf39d5a37232404ef72d7cf99

● Booted ostree
           Commit: 29e8172e477aad07379f6221532b33856aff9e5ae79da01729e7d3e0dae2b4f1

  Rollback ostree
           Commit: 76e6daf25315ce00219fa7a2c691f6e2b61a01e983d7ab481e1a318f21cd98b2

   Other image: ghcr.io/ublue-os/bluefin-dx:gts
        Digest: sha256:e460f970fa448e54dc891c4e0443fc579029540bdb6783a7f62498c91822e981 (amd64)
       Version: gts-41.20250629.2 (2025-06-29T21:44:14Z)
        Pinned: yes

Output of groups

peter wheel

Extra information or context

System Details Report

---

Report details

• Date generated: 2025-10-27 09:33:49

Hardware Information:

• Hardware Model: Framework Laptop 13 AMD Ryzen 7040Series
• Memory: 32.0 GiB
• Processor: AMD Ryzen™ 7 7840U w/ Radeon™ 780M Graphics × 16
• Graphics: AMD Radeon™ 780M
• Disk Capacity: 2.0 TB

Software Information:

• Firmware Version: 03.09
• OS Name: Bluefin (Version: gts-41.20251012)
• OS Build: 3ddc76e
• OS Type: 64-bit
• GNOME Version: 47
• Windowing System: Wayland
• Kernel Version: Linux 6.16.7-100.fc41.x86_64

[p-sims]

Just reboot as I realised I hadn't in a few months so I was significantly new Bluefin release, and it appears this issue has now been fixed in:

System Details Report

---

Report details

• Date generated: 2025-10-27 22:58:37

Software Information:

• Firmware Version: 03.09
• OS Name: Bluefin (Version: gts-41.20251024)
• OS Build: 7108d00
• OS Type: 64-bit
• GNOME Version: 47
• Windowing System: Wayland
• Kernel Version: Linux 6.16.8-100.fc41.x86_64

[p-sims]

I spoke to soon...

After reboot all is good. However after suspend it is not....
https://cloud.chiltern.org.uk/s/HgDcSojPCL598RP

[p-sims]

Issue still consistently happening when connecting to USB4 dock with two external monitors. Changing screen resolution of 2nd display temporarily fixes issue, but after anywhere between 30mins and 10hour it will re-occur. It consistently happens with 10mins of waking computer from suspend with monitors connected.

Hardware Information:

• Hardware Model: Framework Laptop 13 AMD Ryzen 7040Series
• Memory: 32.0 GiB
• Processor: AMD Ryzen™ 7 7840U w/ Radeon™ 780M Graphics × 16
• Graphics: AMD Radeon™ 780M Graphics

Software Information:

• Firmware Version: 03.09
• OS Name: Bluefin (Version: gts-42.20251209.1)
• OS Build: 992da1e
• OS Type: 64-bit
• GNOME Version: 48
• Windowing System: Wayland
• Kernel Version: Linux 6.17.7-200.fc42.x86_64

[repires]

Possibly newer kernels might fix the regressions:
https://www.phoronix.com/news/AMDGPU-Linux-7.0-More-Fixes
https://www.phoronix.com/news/AMDGPU-Linux-6.19-Regressions

[dosubot]

Hi, @p-sims. I'm Dosu, and I'm helping the bluefin team manage their backlog and am marking this issue as stale.

Issue Summary

• The original flickering/shifting on the 24" Apple Cinema Display appeared to improve after a Bluefin update, but the issue later returned after suspend.
• A reboot temporarily clears the problem, and changing resolution only stabilizes the display briefly.
• The issue is still reproducible when a Framework Laptop 13 (AMD Ryzen 7840U) is connected through a ThinkPad USB4 dock to two external monitors.
• A comment suggested this may be related to newer AMDGPU kernel regressions, with newer-kernel fixes linked as a possible path forward.

Next Steps

• Is this still relevant on the latest version of bluefin? If so, please comment here to keep the discussion open.
• Otherwise, this issue will be automatically closed in 14 days.

Thanks for your understanding and contribution.