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Overlay plane: corrupted buffer when outside bounds of primary plane

Brief summary of the problem:

I'm using an overlay plane to display a 24x24 buffer. I'm moving it around by changing its position (CRTC_X and CRTC_Y).

When the overlay plane stays within the primary plane's bounds, everything is fine. However as soon as the overlay moves out of the primary plane bounds, I can see some sort of buffer corruption.

The overlay plane is in this picture used to display a 24x24 cursor image near the edge of the screen:

IMG_20201127_133414

Some examples of corruption when I move the overlay plane to the right:

IMG_20201127_133444

IMG_20201127_133425

Hardware description:

  • CPU: AMD Ryzen 5 3500U
  • GPU: APU (PCI 1002:15d8 Advanced Micro Devices, Inc. [AMD/ATI] Picasso)
  • System Memory: 6GiB
  • Display(s): integrated screen
  • Type of Diplay Connection: eDP

System infomration:

  • Distro name and Version: Arch Linux
  • Kernel version: ~agd5f/linux, drm-next branch, commit 7ff818f97c30
  • Custom kernel: N/A
  • AMD package version: N/A

How to reproduce the issue:

  1. Clone gamescope
  2. Apply this patch to stop setting ALLOW_MODESET on all commits: https://l.sr.ht/DHTC.txt
  3. Build gamescope
  4. Run it with Steam and enable use of KMS planes: build/gamescope -e -l -d -- steam -tenfoot -steamos >gamescope.log 2>&1
  5. Start Portal 1
  6. Move the cursor to the right edge of the screen
Edited by Simon Ser