Hi AceLan, may you please verify this bug is resolved for Groovy and
Focal with their kernels in -proposed? Thank you!

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https://bugs.launchpad.net/bugs/1905663

Title:
  Add dpcd backlight control for 0x4c83 0x4f41

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  In Progress
Status in linux-oem-5.10 package in Ubuntu:
  New
Status in linux-oem-5.6 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-oem-5.6 source package in Focal:
  Fix Released
Status in linux source package in Groovy:
  Fix Committed
Status in linux source package in Hirsute:
  In Progress

Bug description:
  [Impact]
  There is a new OLED panel that is required to be listed in the EDID quirk to 
make its backlight work.

  [Fix]
  The commit adds its EDID to the quirk.
  https://lkml.org/lkml/2020/11/19/1564

  [Test]
  Verified on Dell's platform with this panel.

  [Where problems could occur]
  Only if this panel switches to use PWM mode only, and doesn't support DPCD 
backlight.

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