[Bug 1955566] Re: iris driver doesn't load correctly on intel pci_id 0x4688

[Timo Aaltonen]

*** This bug is a duplicate of bug 1949553 ***
    https://bugs.launchpad.net/bugs/1949553

focal will get this via impish backport

** This bug has been marked a duplicate of bug 1956915
   New bugfix release 21.2.6

** This bug is no longer a duplicate of bug 1956915
   New bugfix release 21.2.6

** This bug has been marked a duplicate of bug 1949553
   Backport packages for 20.04.4 HWE stack

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https://bugs.launchpad.net/bugs/1955566

Title:
  iris driver doesn't load correctly on intel pci_id 0x4688

Status in OEM Priority Project:
  Triaged
Status in mesa package in Ubuntu:
  New

Bug description:
  [Impact]

   * iris driver doesn't load with pci_id 4688. Instead, it uses llvm.
      we expect the Intel GPU uses iris driver.

  [Test Plan]

   * $ DISPLAY=:0 glxinfo | grep -i opengl
  OpenGL vendor string: Mesa/X.org
  OpenGL renderer string: llvmpipe (LLVM 12.0.0, 256 bits)
  ...
  OpenGL version string: 3.1 Mesa 21.0.3

   * After applying the fix, it shows:

   * $ DISPLAY=:0 glxinfo | grep -i opengl
  OpenGL vendor string: Intel
  OpenGL renderer string: Mesa Intel(R) Graphics (ADL-S GT1)
  ...
  OpenGL version string: 4.6 (Compatibility Profile) Mesa 21.0.3 (git-d4975a0dbc)

  [Where problems could occur]

   * This patch is backport the PCI ID mapping for enabling iris driver which is expected when users have a GPU.
   * If there is any issue occur then we need to fix it with iris driver.

  [Other Info]

   * It already in upstream and we have a platform which using ADL-HX in OEM project. Thus, we need to enable iris on it at least on focal.
   * The patch is simple as to add "CHIPSET(0x4688, adl_gt1, "ADL-S GT1", "Intel(R) Graphics")" in "include/pci_ids/iris_pci_ids.h".
   * Patch backported from df5b14969f9869f363bcc8b2a564c85aaa481597

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