** Changed in: linux (Ubuntu Lunar)
Status: Confirmed => Fix Committed
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https://bugs.launchpad.net/bugs/2032704
Title:
Fix panel brightness issues on HP laptops
Status in HWE Next:
New
Status in linux package in Ubuntu:
Confirmed
Status in linux-oem-6.1 package in Ubuntu:
Invalid
Status in linux-oem-6.5 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Won't Fix
Status in linux-oem-6.1 source package in Jammy:
Confirmed
Status in linux-oem-6.5 source package in Jammy:
Fix Committed
Status in linux source package in Lunar:
Fix Committed
Status in linux-oem-6.1 source package in Lunar:
Invalid
Status in linux-oem-6.5 source package in Lunar:
Invalid
Status in linux source package in Mantic:
Confirmed
Status in linux-oem-6.1 source package in Mantic:
Invalid
Status in linux-oem-6.5 source package in Mantic:
Invalid
Bug description:
[Impact]
Brightness can't be changed or can only be changed once on some modern
HP laptops.
[Fix]
BIOS folks identified the issue where the ACPI _PS0 method isn't called
for the panel device. On Windows the method is being invoked.
This is due to missing _PSC, but since Windows is the de facto spec, we
have to perform the same to make the device functional.
[Test]
Once the fix is applied, the brightness can be changed smoothly.
[Where problems could occur]
According to BIOS folks, Windows also invokes _PS3 for sleep and
shutdown, we need to tackle that in the future.
Right now not calling _PS3 has no ill-effect, per BIOS folks.
X-HWE-Bug: Bug #2032704
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