touch-packages team mailing list archive

[Martin Pitt <martin.pitt@xxxxxxxxxx>]

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?


** Changed in: systemd (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1450044

Title:
  On laptop on card AMD, screen brightness backlight isn't memorized
  between sessions (systemd-backlight)

Status in systemd package in Ubuntu:
  Incomplete

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~3.19.0-15-generic x86_64 Up~1:19 Mem~1798.2/3724.2MB HDD~500.1GB(10.5% used) Procs~208 Client~Shell inxi~2.2.16
  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/356V4C/3445VC/3545VC v: P09AAN.031.CP
             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)
             Resolution: 1366x768@60.1hz
             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
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  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/356V4C/3445VC/3545VC
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-15-generic root=UUID=3cdab672-0213-4aa9-8bb8-6b5a44b121b9 ro quiet splash vt.handoff=7
  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.asset.tag: Base Board Asset Tag
  dmi.board.name: NP355V5X-S01RU
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: BOARD REVISION 00
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP09AAN:bd07/04/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn355V4C/356V4C/3445VC/3545VC:pvrP09AAN.031.CP:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP355V5X-S01RU:rvrBOARDREVISION00:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
  dmi.product.name: 355V4C/356V4C/3445VC/3545VC
  dmi.product.version: P09AAN.031.CP
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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