This bug do exist - with radeon driver(s) [radeonsi in my case] - on some AMD hardware (Kaveri [Radeon R5 Graphics]) - is well known and explained: * https://bbs.archlinux.org/viewtopic.php?id=193130 * https://askubuntu.com/questions/662799/laptop-backlight-sets-to-maximum-at-startup-xubuntu-15-04
Either X apps only handle brightness through a hardcoded /sys path, then: - it should be documented - radeon driver developpers should explain why they do not use it Either X apps can handle various brightness interfaces, then: - they should explain how and where to configure it I do have a working radeon_bl0 sysfs backlight interface (the only one I have), but there seem that no software using it out there. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. 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: New 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1450044/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
