** 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
** Changed in: linux (Ubuntu Groovy)
Status: Invalid => Won't Fix
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oem-5.10 in Ubuntu.
https://bugs.launchpad.net/bugs/1933566
Title:
XPS 9510 (TGL) Screen Brightness could not be changed
Status in HWE Next:
New
Status in linux package in Ubuntu:
Invalid
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Fix Committed
Status in linux-oem-5.10 source package in Focal:
Fix Released
Status in linux source package in Groovy:
Won't Fix
Status in linux source package in Hirsute:
Fix Committed
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_dpcd_backlight=1. If your machine
needs this, please file a _new_ bug report on drm/i915, see
https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs
for details.
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.
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