The backlight brightness is not set to the level during the last logoff.If I restart (with the adapter on) at 30%Brightness, on the very log on the brightness is reverted to 100%. However if I press the brightness button once (either the increase or the decrease) the brightness is adjusted to the level set at the previous logoff.Tested in upstream kernel 4.3.0 but the issue is not fixed there as well.
Search in dmesg gives the following
[ 3.553567] [drm] radeon atom DIG backlight initialized
[ 4.883686] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a backlight controller
Current System:
Linux Username-HP-Notebook 4.2.0-16-generic #19-Ubuntu SMP Thu Oct 8 15:35:06 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Computer Model:
HP-15 AF008ax
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-4.2.0-16-generic 4.2.0-16.19 [modified: boot/vmlinuz-4.2.0-16-generic]
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
ApportVersion: 2.19.1-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: soumyajyoti 1522 F.... pulseaudio
/dev/snd/controlC0: soumyajyoti 1522 F.... pulseaudio
CurrentDesktop: Unity
Date: Sat Nov 14 23:18:54 2015
HibernationDevice: RESUME=UUID=32bbfbc8-d105-43a2-97d8-e6026bffbdab
InstallationDate: Installed on 2015-11-11 (2 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: Hewlett-Packard HP Notebook
ProcFB:
0 radeondrmfb
1 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic root=UUID=79ea6210-b7e1-4a35-b0e5-741b260fabf5 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.2.0-16-generic N/A
linux-backports-modules-4.2.0-16-generic N/A
linux-firmware 1.149.2
SourcePackage: linux
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/13/2015
dmi.bios.vendor: Insyde
dmi.bios.version: F.13
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 80CC
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 99.35
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsyde:bvrF.13:bd08/13/2015:svnHewlett-Packard:pnHPNotebook:pvrType1ProductConfigId:rvnHewlett-Packard:rn80CC:rvr99.35:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.name: HP Notebook
dmi.product.version: Type1ProductConfigId
dmi.sys.vendor: Hewlett-Packard
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