[Bug 1911001] [NEW] Use DCPD to control HP DreamColor panel

Public bug reported:

[Impact]
Cannot change brightness on HP ZBook Fury with certain panel.

[Fix]
Add the panel to DPCD quirk table to use DPCD to control the panel
backlight.

[Test]
Changing backlight sysfs doesn't change the display brightness.
With the patch applied, changing sysfs backlight can really change the
display brightness.

[Where problems could occur]
This fix is specific to a single panel, so it's not likely to cause any
regression to other devices.

** Affects: hwe-next
Importance: Undecided
Status: New

** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete

** Affects: linux-oem-5.10 (Ubuntu)
Importance: Undecided
Status: Invalid

** Affects: linux (Ubuntu Focal)
Importance: Medium
Status: Confirmed

** Affects: linux-oem-5.10 (Ubuntu Focal)
Importance: Medium
Status: Confirmed

** Affects: linux (Ubuntu Groovy)
Importance: Medium
Status: Confirmed

** Affects: linux-oem-5.10 (Ubuntu Groovy)
Importance: Undecided
Status: Won't Fix


** Tags: oem-priority originate-from-1909961 stella

** Also affects: linux-oem-5.10 (Ubuntu)
Importance: Undecided
Status: New

** Also affects: linux (Ubuntu Groovy)
Importance: Undecided
Status: New

** Also affects: linux-oem-5.10 (Ubuntu Groovy)
Importance: Undecided
Status: New

** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New

** Also affects: linux-oem-5.10 (Ubuntu Focal)
Importance: Undecided
Status: New

** Changed in: linux (Ubuntu Focal)
Status: New => Confirmed

** Changed in: linux (Ubuntu Groovy)
Status: New => Confirmed

** Changed in: linux-oem-5.10 (Ubuntu)
Status: New => Invalid

** Changed in: linux-oem-5.10 (Ubuntu Groovy)
Status: New => Won't Fix

** Changed in: linux-oem-5.10 (Ubuntu Focal)
Status: New => Confirmed

** Changed in: linux (Ubuntu Focal)
Importance: Undecided => Medium

** Changed in: linux (Ubuntu Groovy)
Importance: Undecided => Medium

** Changed in: linux-oem-5.10 (Ubuntu Focal)
Importance: Undecided => Medium

** Tags added: oem-priority originate-from-1909961 stella

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https://bugs.launchpad.net/bugs/1911001

Title:
Use DCPD to control HP DreamColor panel

Status in HWE Next:
New
Status in linux package in Ubuntu:
Incomplete
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Confirmed
Status in linux-oem-5.10 source package in Focal:
Confirmed
Status in linux source package in Groovy:
Confirmed
Status in linux-oem-5.10 source package in Groovy:
Won't Fix

Bug description:
[Impact]
Cannot change brightness on HP ZBook Fury with certain panel.

[Fix]
Add the panel to DPCD quirk table to use DPCD to control the panel
backlight.

[Test]
Changing backlight sysfs doesn't change the display brightness.
With the patch applied, changing sysfs backlight can really change the
display brightness.

[Where problems could occur]
This fix is specific to a single panel, so it's not likely to cause any
regression to other devices.

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