Bug Report: Video rotation brake the video

[camohub]

Hi there, I have the following stack:
Model: ROC-RK3588S-PC V12 (Linux)
SoC: Rockchip RK3588
GPU: Mali-G610 (Panfrost/Panfork)
Kernel: 6.1.0-1025-rockchip
OS: Ubuntu 24.04.1 LTS (Joshua-Riek image v2.4.0)
Mesa: Panfork 23.0.5 (git221210 — December 2022)
Chromium: 114.0.5735.35 (rkmpp7 from jjriek/rockchip-multimedia PPA)
Display: HDMI-1, 1920x1080@60Hz
The problem:
I'm running a kiosk application in Chromium that plays video fullscreen. The display is physically mounted in portrait mode (9:16), so I need to rotate the output 270°. When rotation is applied, a visible vertical line artifact appears running from top to bottom, approximately 5cm from the right edge of the screen. Without rotation, the image is perfectly clean — no artifacts at all.
What I've tried (all failed to fix the issue):

1. CSS rotation (current method):
   Using transform: rotate(270deg) on the body element. The line artifact appears consistently.
2. xrandr rotation:
   xrandr --output HDMI-1 --rotate left — same vertical line artifact appears.
3. Kernel DRM rotation:
   Added video=HDMI-A-1:1920x1080@60,rotate=270 to kernel cmdline in extlinux.conf. Parameter is visible in /proc/cmdline but has no effect — Rockchip DRM driver does not support the rotate parameter.
4. Chromium flags (tested individually and in combinations):

--disable-gpu-compositing — moved the line to the center of the screen
--disable-gpu-rasterization / --disable-gpu-vsync — made it worse
--use-gl=egl — no effect
--enable-gpu-rasterization --enable-zero-copy — no effect
--default-tile-width=1920 --default-tile-height=1080 — no effect
--gpu-rasterization-msaa-sample-count=0 — no effect
--force-device-scale-factor=1 — no effect
--use-gl=angle --use-angle=gles-egl --use-cmd-decoder=passthrough — crashed Chromium

5. CSS GPU optimization properties:
   Tested translateZ(0), backface-visibility: hidden, will-change: transform on the rotation container — no effect on the artifact.
6. Chromium 132 upgrade:
   Installed chromium 132.0.6834.159-1~deb12u1+rkmpp from liujianfeng1994/chromium PPA. The vertical line remained, and video playback became unstable (freezing). Reverted to Chromium 114.
7. Mesa upgrade to Ubuntu noble-updates 25.2.8:
   Removed Panfork PPA and installed standard Ubuntu Mesa 25.2.8. GPU fell back to llvmpipe (software rendering) — no Panfrost support for Mali-G610 in standard Mesa. Display showed tearing in the center. Reverted to Panfork 23.0.5.
   Conclusion:
   The artifact appears with any rotation method (CSS, xrandr, kernel) and persists across Chromium versions and various GPU flags. This strongly suggests the issue is in the Panfork Mesa / Panfrost compositing layer when handling rotated output on Mali-G610.
   Has anyone encountered this issue? Is there a known fix or workaround? Would upgrading to Panthor (with kernel 6.10+ or the 6.1 backport) potentially resolve this?
   Any help would be greatly appreciated.

Kernel version

6.1.0-1025-rockchip

SBC model

ROC-RK3588S-PC V12(Linux)

What operating system are you seeing this problem on?

Ubuntu 24.04 LTS (Noble Nombat)

Relevant logs