Fix panel brightness issues on HP laptops
Bug #2032704 reported by
Kai-Heng Feng
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | ||
---|---|---|---|---|---|---|
HWE Next |
New
|
Undecided
|
Unassigned | |||
linux (Ubuntu) | Status tracked in Mantic | |||||
Jammy |
Won't Fix
|
Undecided
|
Unassigned | |||
Lunar |
Fix Released
|
Medium
|
Unassigned | |||
Mantic |
Fix Released
|
Medium
|
Unassigned | |||
linux-oem-6.1 (Ubuntu) | Status tracked in Mantic | |||||
Jammy |
Fix Released
|
Medium
|
Unassigned | |||
Lunar |
Invalid
|
Undecided
|
Unassigned | |||
Mantic |
Invalid
|
Undecided
|
Unassigned | |||
linux-oem-6.5 (Ubuntu) | Status tracked in Mantic | |||||
Jammy |
Fix Released
|
Medium
|
Unassigned | |||
Lunar |
Invalid
|
Undecided
|
Unassigned | |||
Mantic |
Invalid
|
Undecided
|
Unassigned |
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
CVE References
Changed in linux (Ubuntu Lunar): | |
status: | New → Confirmed |
Changed in linux (Ubuntu Mantic): | |
status: | New → Confirmed |
Changed in linux (Ubuntu Lunar): | |
importance: | Undecided → Medium |
Changed in linux (Ubuntu Mantic): | |
importance: | Undecided → Medium |
Changed in linux-oem-6.1 (Ubuntu Lunar): | |
status: | New → Invalid |
Changed in linux-oem-6.1 (Ubuntu Mantic): | |
status: | New → Invalid |
Changed in linux-oem-6.5 (Ubuntu Lunar): | |
status: | New → Invalid |
Changed in linux-oem-6.5 (Ubuntu Mantic): | |
status: | New → Invalid |
Changed in linux (Ubuntu Jammy): | |
status: | New → Won't Fix |
Changed in linux-oem-6.1 (Ubuntu Jammy): | |
status: | New → Confirmed |
Changed in linux-oem-6.5 (Ubuntu Jammy): | |
status: | New → Confirmed |
Changed in linux-oem-6.1 (Ubuntu Jammy): | |
importance: | Undecided → Medium |
Changed in linux-oem-6.5 (Ubuntu Jammy): | |
importance: | Undecided → Medium |
description: | updated |
tags: | added: hwe-next oem-priority originate-from-2032704 |
tags: | added: originate-from-2009563 |
tags: | added: originate-from-2009552 |
tags: | added: originate-from-1991663 |
Changed in linux-oem-6.5 (Ubuntu Jammy): | |
status: | Confirmed → Fix Committed |
tags: | added: verification-needed-jammy-linux-oem-6.5 |
Changed in linux (Ubuntu Lunar): | |
status: | Confirmed → Fix Committed |
tags: |
added: verification-done-jammy-linux-oem-6.5 removed: verification-needed-jammy-linux-oem-6.5 |
Changed in linux-oem-6.1 (Ubuntu Jammy): | |
status: | Confirmed → Fix Committed |
tags: |
added: verification-done-lunar-linux removed: verification-needed-lunar-linux |
tags: |
added: verification-done-jammy-linux-oem-6.1 removed: verification-needed-jammy-linux-oem-6.1 |
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linux-oem-22.04d 6.5.0.1003.3 in jammy-proposed contains the fix. https:/ /changelogs. ubuntu. com/changelogs/ pool/main/ l/linux- oem-6.5/ linux-oem- 6.5_6.5. 0-1003. 3/changelog