[SRU] [F/G/Unstable/OEM-5.6] [PATCH 0/3] Enable brightness control on HP DreamColor panel

Kai-Heng Feng kai.heng.feng at canonical.com
Wed Oct 7 11:53:56 UTC 2020

BugLink: https://bugs.launchpad.net/bugs/1898865

Brightness on HP DreamColor panel, which can be found on new HP Zbook
Studio, cannot be changed.

Let DRM know the panel should use DPCD instead of PWM to control

With the patch applied, we can change the brightness on HP Zbook Studio.

[Regression Potential]
If there's any panel in the quirk list depends on checking brightness
control capability then this change will have an impact. However it's
rather unlikely because it defeats the purpose of the quirk list.

Kai-Heng Feng (2):
  UBUNTU: SAUCE: drm/i915/dpcd_bl: Skip testing control capability with
    force DPCD quirk
  UBUNTU: SAUCE: drm/dp: HP DreamColor panel brigntness fix

Lyude Paul (1):
  drm/i915/dpcd_bl: Unbreak enable_dpcd_backlight modparam

 drivers/gpu/drm/drm_dp_helper.c                       | 1 +
 drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 9 ++++++---
 2 files changed, 7 insertions(+), 3 deletions(-)


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