Ubuntu
gnome-control-center package

Brightness is not show in desktop mode

Bug #1967335 reported by Yhojann Aguilera on 2022-03-31

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	gnome-control-center	New	Unknown	auto-gitlab.gnome.org-gnome-gnome-control-center-- #1209
	gnome-control-center (Ubuntu)	Triaged	Low	Unassigned

Bug Description

The brightness level control is visible only on a notebook, but it is not visible on the desktop version. The brightness of both my monitors are excessive and I must be turning down and up from the rear buttons, I would prefer that I could manipulate the brightness from the control panel like with the notebook version.

For some reason this control disappears in the desktop version.

At the moment I must use xrand to lower the brightness manually, although when I lock the computer or restart it the brightness is restored and I must be running those commands multiple times during the day.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: evince 42.1-1
ProcVersionSignature: Ubuntu 5.15.0-23.23-generic 5.15.27
Uname: Linux 5.15.0-23-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu79
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu Mar 31 13:35:45 2022
InstallationDate: Installed on 2022-03-30 (0 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20220326)
SourcePackage: evince
UpgradeStatus: No upgrade log present (probably fresh install)

Tags:

Revision history for this message

Yhojann Aguilera (whk102) wrote on 2022-03-31:

Dependencies.txt Edit (6.1 KiB, text/plain; charset="utf-8")
KernLog.txt Edit (739 bytes, text/plain; charset="utf-8")
ProcCpuinfoMinimal.txt Edit (1.3 KiB, text/plain; charset="utf-8")
ProcEnviron.txt Edit (115 bytes, text/plain; charset="utf-8")
RelatedPackageVersions.txt Edit (159 bytes, text/plain; charset="utf-8")

Revision history for this message

Yhojann Aguilera (whk102) wrote on 2022-04-01:

Now, from wyland can not change brightness.

Jeremy Bícha (jbicha) on 2022-04-01

affects:	ubuntu → gnome-control-center (Ubuntu)
Changed in gnome-control-center (Ubuntu):
importance:	Undecided → Low
status:	New → Triaged

Bug Watch Updater (bug-watch-updater) on 2022-10-29

Changed in gnome-control-center:
status:	Unknown → New

Revision history for this message

Yhojann Aguilera (whk102) wrote on 2024-05-16:

Now from Ubuntu 24.04 can change brightness using

- From Ubuntu Desktop session (wayland): `sudo ddcutil setvcp 10 5 --display 1`.
- From Xorg session: `xrandr --output HDMI-1 --brightness 0.5`.

The idea is that the brightness change could be done in a friendly way from the gnome screen brightness control instead of the terminal. For example, if the computer supports backlight, make the change from this class, but do it at a high level with xrandr or ddcutil depending on whether the user uses Ubuntu desktop or xorg.