On laptop on card AMD, screen brightness backlight isn't memorized between sessions (systemd-backlight)
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
systemd (Ubuntu) |
Expired
|
Undecided
|
Unassigned |
Bug Description
HOW TO REPRODUCE:
1. Boot a laptop (on example my laptop on base Dual core AMD A6-4400M APU with Radeon HD Graphics 7670m) with Ubuntu 15.04 (systemd).
2. Set a different screen backlight brightness level.
3. Reboot.
RESULT:
Backlight is not memorized.
Description laptop:
CPU~Dual core AMD A6-4400M APU with Radeon HD Graphics (-MCP-) speed/max~2000/2700 MHz Kernel~
iv@iv-pc:~$ inxi -v5
System: Host: iv-pc Kernel: 3.19.0-15-generic x86_64 (64 bit gcc: 4.9.2)
Desktop: Unity 7.3.2 (Gtk 3.14.12-0ubuntu2)
Distro: Ubuntu 15.04 vivid
Machine: System: SAMSUNG product: 355V4C/
Mobo: SAMSUNG model: NP355V5X-S01RU v: BOARD 00
Bios: American Megatrends v: P09AAN date: 07/04/2013
CPU: Dual core AMD A6-4400M APU with Radeon HD Graphics (-MCP-) cache: 2048 KB
flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm) bmips: 10780
clock speeds: max: 2700 MHz 1: 2700 MHz 2: 2400 MHz
Memory: Using dmidecode: you must be root to run dmidecode
Graphics: Card-1: Advanced Micro Devices [AMD/ATI] Trinity [Radeon HD 7520G]
bus-ID: 00:01.0
Card-2: Advanced Micro Devices [AMD/ATI] Thames [Radeon HD 7500M/7600M Series]
bus-ID: 01:00.0
Display Server: X.Org 1.17.1 drivers: ati,radeon (unloaded: fbdev,vesa)
GLX Renderer: Gallium 0.4 on AMD ARUBA
GLX Version: 3.0 Mesa 10.5.2 Direct Rendering: Yes
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: systemd 219-7ubuntu3
ProcVersionSign
Uname: Linux 3.19.0-15-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Apr 29 17:16:22 2015
InstallationDate: Installed on 2015-04-29 (0 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 355V4C/
ProcKernelCmdLine: BOOT_IMAGE=
SourcePackage: systemd
UdevLog: Error: [Errno 2] Нет такого файла или каталога: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/04/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P09AAN
dmi.board.
dmi.board.name: NP355V5X-S01RU
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: BOARD REVISION 00
dmi.chassis.
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.
dmi.modalias: dmi:bvnAmerican
dmi.product.name: 355V4C/
dmi.product.
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
description: | updated |
summary: |
On laptop on card AMD, screen brightness backlight isn't memorized - between sessions + between sessions (systemd-backlight) |
Changed in systemd (Ubuntu): | |
status: | Expired → New |
Indeed the log says
апр. 29 15:48:07 username-pc systemd- backlight[ 442]: Failed to get backlight or LED device 'backlight: acpi_video0' : No such file or directory
Can you please give me the output of
grep -r . /sys/class/ backlight/ *
Are you using the free driver or the AMD proprietary one? On several boards the backlight is directly hardwired to the brightness buttons and they can't be controlled through software. If you press the brightness keys, do you get a notification bubble for that which shows the current value?