Public bug reported:

[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 uses PWM mode only, and doesn't support DPCD backlight.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: AceLan Kao (acelankao)
         Status: In Progress

** Affects: linux-oem-5.6 (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: linux (Ubuntu Focal)
     Importance: Undecided
     Assignee: AceLan Kao (acelankao)
         Status: In Progress

** Affects: linux-oem-5.6 (Ubuntu Focal)
     Importance: Undecided
     Assignee: AceLan Kao (acelankao)
         Status: In Progress

** Affects: linux (Ubuntu Groovy)
     Importance: Undecided
     Assignee: AceLan Kao (acelankao)
         Status: In Progress

** Affects: linux (Ubuntu Hirsute)
     Importance: Undecided
     Assignee: AceLan Kao (acelankao)
         Status: In Progress

** Also affects: linux-oem-5.6 (Ubuntu)
   Importance: Undecided
       Status: New

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

** Also affects: linux-oem-5.6 (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

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

** Also affects: linux-oem-5.6 (Ubuntu Groovy)
   Importance: Undecided
       Status: New

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

** Also affects: linux-oem-5.6 (Ubuntu Focal)
   Importance: Undecided
       Status: New

** No longer affects: linux-oem-5.6 (Ubuntu Groovy)

** No longer affects: linux-oem-5.6 (Ubuntu Hirsute)

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

Title:
  Add dpcd backlight control for 0x4c83 0x4f41

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