** Also affects: linux-oem-osp1 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux-oem-osp1 (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: linux-5.4 (Ubuntu Bionic)
Importance: Undecided
Status: New
** No longer affects: linux-5.4 (Ubuntu Bionic)
** No longer affects: linux-oem-osp1 (Ubuntu Focal)
** Changed in: linux-oem-osp1 (Ubuntu Bionic)
Status: New => Fix Committed
** Changed in: linux-oem-osp1 (Ubuntu)
Status: New => Invalid
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-5.4 in Ubuntu.
https://bugs.launchpad.net/bugs/1861521
Title:
[FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled
Status in linux-5.4 package in Ubuntu:
In Progress
Status in linux-oem-osp1 package in Ubuntu:
Invalid
Status in linux-oem-osp1 source package in Bionic:
Fix Committed
Status in linux-5.4 source package in Focal:
In Progress
Bug description:
[Impact]
After Ubuntu-5.4.0-9.12 which introduce DPCD backlight patches, the
backlight control on some platforms fail to work.
It seems using OUI string to map the panels which support DPCD
backlight doesn't work well, it mis-mapped those panel that doesn't
support DPCD backlight, and breaks the backlight control.
[Fix]
The author of the origin DPCD backlight patches recently provides a
DP quirks based on EDID identification.
[Fix]
Verified on the machine with DPCD backlight and also on the machine
which has regression with the OUI quirks, both of them work now.
[Regression Potential]
Low, it introduce a new quirks to list the panels which support DPCD
backlight.
===============================
After upgrading from Eoan (5.3.0-29.31) to Focal (5.4.0-12.15), I no
longer have the ability to control the backlight brightness on my HP
EliteBook 840 G5. When pressing the brightness hotkeys, the on-screen
indicator pops up and shows that the brightness setting is being
changed but the actual screen brightness is stuck on the lowest
setting.
This laptop has a built-in privacy screen. If I activate the privacy
screen (fn-f2), then the actual screen brightness goes to the maximum
setting and then I am able to dim and brighten the backlight as long
as the privacy screen functionality is turned on.
This is a regression from Eoan's 5.3.0-29.31 kernel where I was able
to control the brightness with and without the privacy screen
functionality being turned on.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-12-generic 5.4.0-12.15
ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
Uname: Linux 5.4.0-12-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu16
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Jan 31 11:42:16 2020
InstallationDate: Installed on 2019-06-24 (221 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: linux-signed-5.4
UpgradeStatus: Upgraded to focal on 2020-01-28 (3 days ago)
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