XPS 9510 (TGL) Screen Brightness could not be changed
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
HWE Next |
Fix Released
|
Undecided
|
Unassigned | ||
linux (Ubuntu) |
Invalid
|
Undecided
|
Unassigned | ||
Focal |
Fix Released
|
Undecided
|
AceLan Kao | ||
Groovy |
Won't Fix
|
Undecided
|
AceLan Kao | ||
Hirsute |
Fix Released
|
Undecided
|
AceLan Kao | ||
linux-oem-5.10 (Ubuntu) |
Invalid
|
Undecided
|
Unassigned | ||
Focal |
Fix Released
|
Undecided
|
AceLan Kao |
Bug Description
[Impact]
Dell XPS 15 9510(TGL) uses DPCD to control backlight, and need to add this panel to edid_quirk.
kernel: [ 1.719773] i915 0000:00:02.0: [drm] Panel advertises DPCD backlight support, but VBT disagrees. If your backlight controls don't work try booting with i915.enable_
Kernel 5.12+ support the backlight via:
commit: <4a8d79901d5b> ("drm/i915/dp: Enable Intel's HDR backlight interface (only SDR for now)"), and doesn't need this quirk.
[Fix]
Adding the panel's MFG to edid_quirk makes system switch to use DPCD to control backlight.
[Test]
Verified on Dell XPS 9510(TGL)
[Where problems could occur]
The quirk is for a dedicate panel, and won't affect other platforms.
CVE References
Changed in linux (Ubuntu Focal): | |
status: | New → In Progress |
Changed in linux (Ubuntu Groovy): | |
status: | New → In Progress |
Changed in linux (Ubuntu Hirsute): | |
status: | New → In Progress |
Changed in linux-oem-5.10 (Ubuntu Focal): | |
status: | New → In Progress |
Changed in linux (Ubuntu): | |
status: | New → Invalid |
Changed in linux-oem-5.10 (Ubuntu): | |
status: | New → Invalid |
no longer affects: | linux-oem-5.10 (Ubuntu Groovy) |
no longer affects: | linux-oem-5.10 (Ubuntu Hirsute) |
Changed in linux (Ubuntu Focal): | |
assignee: | nobody → AceLan Kao (acelankao) |
Changed in linux (Ubuntu Groovy): | |
assignee: | nobody → AceLan Kao (acelankao) |
Changed in linux (Ubuntu Hirsute): | |
assignee: | nobody → AceLan Kao (acelankao) |
Changed in linux-oem-5.10 (Ubuntu Focal): | |
assignee: | nobody → AceLan Kao (acelankao) |
description: | updated |
description: | updated |
tags: | added: oem-priority originate-from-1933030 somerville |
Changed in linux-oem-5.10 (Ubuntu Focal): | |
status: | In Progress → Fix Committed |
tags: |
added: verification-done-focal removed: verification-needed-focal |
Changed in linux (Ubuntu Focal): | |
status: | In Progress → Fix Committed |
Changed in linux (Ubuntu Hirsute): | |
status: | In Progress → Fix Committed |
Changed in linux (Ubuntu Groovy): | |
status: | In Progress → Invalid |
status: | Invalid → Won't Fix |
tags: |
added: verification-done-hirsute removed: verification-needed-hirsute |
Changed in hwe-next: | |
status: | New → Fix Committed |
status: | Fix Committed → Fix Released |
This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification- needed- focal' to 'verification- done-focal' . If the problem still exists, change the tag 'verification- needed- focal' to 'verification- failed- focal'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.
See https:/ /wiki.ubuntu. com/Testing/ EnableProposed for documentation how to enable and use -proposed. Thank you!