tag: kernel-bug-exists-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Tags added: kernel-bug-exists-upstream
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https://bugs.launchpad.net/bugs/1768152
Title:
Brightness controll doesn't work - Samsung R560
Status in linux package in Ubuntu:
Confirmed
Bug description:
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)
---
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: thomas 1205 F.... pulseaudio
CurrentDesktop: KDE
DistroRelease: Ubuntu 18.04
InstallationDate: Installed on 2018-04-30 (0 days ago)
InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64
(20180426)
MachineType: SAMSUNG ELECTRONICS CO., LTD. R560
NonfreeKernelModules: nvidia
Package: linux (not installed)
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-20-generic
root=UUID=7ca20d22-7baa-4892-a8a3-cd0e628190bc ro quiet splash vt.handoff=1
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
RelatedPackageVersions:
linux-restricted-modules-4.15.0-20-generic N/A
linux-backports-modules-4.15.0-20-generic N/A
linux-firmware 1.173
Tags: bionic
Uname: Linux 4.15.0-20-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 12/09/2008
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 09LA.7027.20081209.JJC
dmi.board.name: R560
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias:
dmi:bvnPhoenixTechnologiesLtd.:bvr09LA.7027.20081209.JJC:bd12/09/2008:svnSAMSUNGELECTRONICSCO.,LTD.:pnR560:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnR560:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A:
dmi.product.name: R560
dmi.product.version: Not Applicable
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
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