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[Bug 1535470] Re: Backlight brightness keys not working
I have a different Clevo model (P751DM-G) but with same issue: the
backlight Fn-keys doesn't work neither out of the box, nor with a kernel
4.6. Well, in fact, they work until I suspend/resume, and then they no
longer work. Looking at acpi_listen, I noticed that after first
suspend/resume cycle, some ACPI events where no longer triggered (like
the backlight Fn-keys, but also the lid close!).
I found a fix by loading a clevo-wmi driver. There are several clevo-wmi drivers on the internet (various attempts to write a driver for it...). For my laptop, I use:
* https://bitbucket.org/lynthium/clevo-xsm-wmi (it aims at supporting all Clevo models)
Since the clevo-xsm-wmi driver doesn't seem to handle your P65 model, you may need to try some other ones, like this one:
Maybe it could help for you too.
To be honest, I have no idea why it did fix my backlight fn-keys, as
those drivers are supposed to handle different features (keyboard
backlight, rfkill switch, hw monitoring). Nevertheless, if I unload the
module, then the issue happen again.
Note that this workaround fixes the Fn-keys: the backlight popup notification appears and I can increase/decrease value, however it has no effect on the screen. This is just ACPI event that has been fixed.
In order to really adjust LCD backlight, I have to play with nvidia-settings (with proprietary driver). Example, to set backlight brightness at 50%:
nvidia-settings -n -a BacklightBrightness=50
Some glue is still missing to link ACPI events with nvidia-settings.
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Backlight brightness keys not working
Status in linux package in Ubuntu:
Originally described in bug 1533221. This is a new bug to track this
additional issue separately.
The above bug has h/w info attached etc. This is a new skylake
Backlight function keys are not working. I have tried various
with no luck.
USER PID ACCESS COMMAND
/dev/snd/controlC0: ian 2218 F.... pulseaudio
DistroRelease: Ubuntu 15.10
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 5986:066d Acer, Inc
Bus 001 Device 003: ID 8087:0a2b Intel Corp.
Bus 001 Device 002: ID 1c7a:0603 LighTuning Technology Inc.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Notebook P65_P67RGRERA
NonfreeKernelModules: nvidia_modeset nvidia
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-0-generic root=UUID=2077d068-d7ee-4407-89e1-7d2b884173de ro acpi_osi=Linux acpi_backlight=native drm.debug=14
ProcVersionSignature: Ubuntu 4.4.0-0.12-generic 4.4.0
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
Uname: Linux 4.4.0-0-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
dmi.bios.vendor: American Megatrends Inc.
dmi.board.asset.tag: Tag 12345
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.product.version: Not Applicable
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