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Hi,
I just migrated from Gentoo Linux to KUbuntu 18.04 LTS. Now I noticed
that brightness control doesn't work in Ubuntu (FN Keys show KDE Dialog
Brightness changed but display stays at full Backlight). Even writing to
/sys/class/backlight/acpi_video0/brightness doesn't change the
brightness level. In Gentoo everything was working fine, display
backlight responded to KDE and/or to /sys/class/backlight/... . As I now
I had a bug Ticket at Kernel org with user Tux12Fun an it was
implemented long time ago into the Kernel Main Line. But I can't find
the Ticket on Kernel.org now :-(
So I try to provide all the information i can collect from the old
installation.
Hardware: Samsung R560 Laptop
Model: NP-R560-AS05DE
Gentoo Kernel: linux-4.4.67-gentoo
Gentoo Video Driver: original Nvidia 340.106 with Gentoo Kernel Patch
nvidia-drivers-381.09-v3.patch
Ubuntu Kernel: 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018
x86_64 x86_64 x86_64 GNU/Linux
Ubuntu Video Driver: NVidia 390.42
root@rechner4:/# lsb_release -rd
Description: Ubuntu 18.04 LTS
Release: 18.04
lspci -vvv attached.
Kernel Config of my old Gentoo attached.
I hope we can mange it to get backlight control working on Ubuntu as
it's nearly inpossible to work with full backlight at night :-(
Thank you for your work.
Best regards form Bavaria
Tux12Fun (Thomas)
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
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Brightness controll doesn't work - Samsung R560
https://bugs.launchpad.net/bugs/1768152
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