Public bug reported:
[Impact]
PWM backlight doesn't work on an upcoming HP CML system.
[Fix]
Use DPCD to control backlight instead of PWM.
[Test]
With this patch applied, changing backlight sysfs can change the brightness.
[Regression Potential]
Low. This is specific to panel ID, which is unique.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
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https://bugs.launchpad.net/bugs/1871589
Title:
Add DCPD backlight support for HP CML system
Status in linux package in Ubuntu:
Incomplete
Bug description:
[Impact]
PWM backlight doesn't work on an upcoming HP CML system.
[Fix]
Use DPCD to control backlight instead of PWM.
[Test]
With this patch applied, changing backlight sysfs can change the brightness.
[Regression Potential]
Low. This is specific to panel ID, which is unique.
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