Can't adjust brightness on HP ZBook Fury 17 G7

[AceLan Kao]

[Impact]
The brightness could not be adjusted, and after resumed the screen is blank.

[Fix]
It looks like below commit in oem-5.10 introduces the regression
   ade9f1d9f14ef drm/i915/dp: Program source OUI on eDP panels
But it's not the culprit as mainline kernel doesn't have this issue.
So, adding a quirk on this commit to make it only affect on a certain Dell platform to avoid the issue. Will figure out the problem and submit a formal fix later.

[Test]
Verified on Dell and HP platforms, both platforms work well.

[Where problems could occur]
The quirk should be pretty safe for other platforms.

[Hao-Sheng Lu (haosheng.lu)]

https://bugs.launchpad.net/stella/+bug/1909961/comments/24

Tested with the test kernel and got positive results.

[Timo Aaltonen (tjaalton)]

you didn't test -1023 currently in proposed?

[Chih-Hsyuan Ho (chih)]

I just compared the test results in -1021(NG) and -1023(OK) kernels and could confirm the fix in one of the affected HP machines.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-oem-5.10 - 5.10.0-1023.24

---------------
linux-oem-5.10 (5.10.0-1023.24) focal; urgency=medium

  * focal/linux-oem-5.10: 5.10.0-1023.24 -proposed tracker
    (LP: #1924513)

  * Can't adjust brightness on HP ZBook Fury 17 G7 (LP: #1923000)
    - SAUCE: drm/i915/dp add a quirk for backlight issue

  * CIFS DFS entries not accessible with 5.4.0-71.74-generic (LP: #1923670)
    - Revert "cifs: Set CIFS_MOUNT_USE_PREFIX_PATH flag on setting
      cifs_sb->prepath."

 -- Stefan Bader <email address hidden> Thu, 15 Apr 2021 15:12:17 +0200