Thomas, the next step is to fully commit bisect from kernel 4.4 to 4.15
in order to identify the last good kernel commit, followed immediately
by the first bad one. This will allow for a more expedited analysis of
the root cause of your issue. Could you please do this following
https://wiki.ubuntu.com/Kernel/KernelBisection ?
Please note, finding adjacent kernel versions, or providing a commit
from a kernel version bisect is not fully commit bisecting.
Also, the kernel release names are irrelevant for the purposes of
bisecting.
It is most helpful that after the fix commit (not kernel version) has
been identified, you then mark this report Status Confirmed.
Thank you for your help.
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
** Summary changed:
- Brightness controll doesn't work - Samsung R560
+ [Samsung NP-R560-AS05DE] Brightness control doesn't work
** Tags added: kernel-bug-exists-upstream-4.17-rc3 needs-bisect
regression-release
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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1768152
Title:
[Samsung NP-R560-AS05DE] Brightness control doesn't work
Status in linux package in Ubuntu:
Incomplete
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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