[PATCH 0/2][SRU][OEM-5.10][H] Can't adjust brightness on Dell Precision 7000 laptop

[AceLan Kao]

From: "Chia-Lin Kao (AceLan)" <acelan.kao at canonical.com>

BugLink: https://bugs.launchpad.net/bugs/1917419

[Impact]
Screen brightness can't be adjusted. It can't be adjusted via Hotkey and
system setting. You can see the value bar changed, but brightness
doesn't. 

[Fix]
Bisect mainine kernel and found below commit in v5.12-rc1 fix the issue.
f12110afee05 drm/i915/dp: Program source OUI on eDP panels

[Test]
Verified on Dell Precision 7000 laptop with DPCD eDP panel.

[Where problems could occur]
It checks the source OUI before writing it, so it won't re-program the
source OUI during driver initialization.

Kai-Heng Feng (1):
  drm/i915: Init lspcon after HPD in intel_dp_detect()

Lyude Paul (1):
  drm/i915/dp: Program source OUI on eDP panels

 drivers/gpu/drm/i915/display/intel_ddi.c    | 19 +------
 drivers/gpu/drm/i915/display/intel_dp.c     | 43 +++++++++++++--
 drivers/gpu/drm/i915/display/intel_hdmi.c   |  2 +-
 drivers/gpu/drm/i915/display/intel_lspcon.c | 61 ++++++++++++---------
 drivers/gpu/drm/i915/display/intel_lspcon.h |  3 +-
 5 files changed, 74 insertions(+), 54 deletions(-)

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2.25.1