[Bug 1898865] Re: Enable brightness control on HP DreamColor panel

** No longer affects: oem-priority

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

Title:
Enable brightness control on HP DreamColor panel

Status in HWE Next:
New
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem-5.6 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Confirmed
Status in linux-oem-5.6 source package in Focal:
Fix Committed
Status in linux source package in Groovy:
Fix Released
Status in linux-oem-5.6 source package in Groovy:
Invalid

Bug description:
[Impact]
Brightness on HP DreamColor panel, which can be found on new HP Zbook
Studio, cannot be changed.

[Fix]
Let DRM know the panel should use DPCD instead of PWM to control
backlight.

[Test]
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.

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