[Bug 1937988] Re: The image is distorted while use iGPU rendering and output via AMD GPU

[Timo Aaltonen]

** Description changed:

- [Steps to reproduce]
+ [Impact]
+ Image is distorted with PRIME, caused by mismatch in stride alignment between intel and amdgpu/nvidia after intel bumped the alignment to 256 bytes.
+ 
+ [Fix]
+ Upstream fixed it in 21.2-series, and backport to 21.0.x needs four commits in total.
+ 
+ [Test case]
  1. Connect a monitor on the AMD GPU.
  2. Power on the system and boot into OS.
- 3. Run below command to launch glxgear
+ 3. Run below command to launch glxgears
  Cmd> DRI_PRIME=1 glxgears -info
  
- [Expected result]
- The image is not distrorted while running the glxgears
+ * Expected result
+ The image is not distorted while running the glxgears
  
- [Actual result]
- The image is distrorted while running the glxgears
+ * Actual result
+ The image is distorted while running the glxgears
+ 
+ [Where things might go wrong]
+ This is a regression caused by the intel driver, so the backports merely fix what got broken. Regressions would only manifest on hybrid graphics platforms.
+ 
  
  ---
  
  Here is the upstream bug for tracking this issue.
  https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11942?commit_id=505f815e5ead8c9872bbda4c1ff3aeaee7223d64

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https://bugs.launchpad.net/bugs/1937988

Title:
  The image is distorted while use iGPU rendering and output via AMD GPU

Status in OEM Priority Project:
  In Progress
Status in mesa package in Ubuntu:
  New
Status in mesa source package in Focal:
  New
Status in mesa source package in Hirsute:
  New

Bug description:
  [Impact]
  Image is distorted with PRIME, caused by mismatch in stride alignment between intel and amdgpu/nvidia after intel bumped the alignment to 256 bytes.

  [Fix]
  Upstream fixed it in 21.2-series, and backport to 21.0.x needs four commits in total.

  [Test case]
  1. Connect a monitor on the AMD GPU.
  2. Power on the system and boot into OS.
  3. Run below command to launch glxgears
  Cmd> DRI_PRIME=1 glxgears -info

  * Expected result
  The image is not distorted while running the glxgears

  * Actual result
  The image is distorted while running the glxgears

  [Where things might go wrong]
  This is a regression caused by the intel driver, so the backports merely fix what got broken. Regressions would only manifest on hybrid graphics platforms.

  
  ---

  Here is the upstream bug for tracking this issue.
  https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11942?commit_id=505f815e5ead8c9872bbda4c1ff3aeaee7223d64

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