This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
groovy' to 'verification-done-groovy'. If the problem still exists,
change the tag 'verification-needed-groovy' to 'verification-failed-
groovy'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-groovy

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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:
  Fix Committed
Status in linux-oem-5.10 source package in Focal:
  Fix Released
Status in linux source package in Groovy:
  Fix Committed
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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