Add DCPD backlight support for HP CML system
Bug #1871589 reported by
Kai-Heng Feng
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
HWE Next |
Fix Released
|
Undecided
|
Unassigned | ||
linux (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned | ||
Focal |
Fix Released
|
Undecided
|
Unassigned | ||
linux-oem-5.6 (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned | ||
Focal |
Fix Released
|
Undecided
|
Unassigned |
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.
CVE References
tags: | added: oem-priority originate-from-1867082 stella |
Changed in linux-oem-5.6 (Ubuntu Focal): | |
status: | New → Fix Committed |
Changed in linux-oem-5.6 (Ubuntu Focal): | |
status: | Fix Committed → Fix Released |
Changed in hwe-next: | |
status: | New → Fix Released |
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This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1871589
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.