Public bug reported:
[Impact]
Brightness on HP DreamColor panel, which can be found on new HP Zbook
Studio, cannot be changed.
[Fix]
Let DRM know the panel should use DPCD instead of PWM to control
backlight.
[Test]
With the patch applied, we can change the brightness on HP Zbook Studio.
[Regression Potential]
If there's any panel in the quirk list depends on checking brightness
control capability then this change will have an impact. However it's
rather unlikely because it defeats the purpose of the quirk list.
** Affects: linux (Ubuntu)
Importance: Medium
Status: Confirmed
** Affects: linux-oem-5.6 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Focal)
Importance: Medium
Status: Confirmed
** Affects: linux-oem-5.6 (Ubuntu Focal)
Importance: Medium
Status: Confirmed
** Affects: linux (Ubuntu Groovy)
Importance: Medium
Status: Confirmed
** Affects: linux-oem-5.6 (Ubuntu Groovy)
Importance: Undecided
Status: Invalid
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https://bugs.launchpad.net/bugs/1898865
Title:
Enable brightness control on HP DreamColor panel
Status in linux package in Ubuntu:
Confirmed
Status in linux-oem-5.6 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Confirmed
Status in linux-oem-5.6 source package in Focal:
Confirmed
Status in linux source package in Groovy:
Confirmed
Status in linux-oem-5.6 source package in Groovy:
Invalid
Bug description:
[Impact]
Brightness on HP DreamColor panel, which can be found on new HP Zbook
Studio, cannot be changed.
[Fix]
Let DRM know the panel should use DPCD instead of PWM to control
backlight.
[Test]
With the patch applied, we can change the brightness on HP Zbook Studio.
[Regression Potential]
If there's any panel in the quirk list depends on checking brightness
control capability then this change will have an impact. However it's
rather unlikely because it defeats the purpose of the quirk list.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1898865/+subscriptions
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