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: * https://github.com/gamaral/clevo-wmi 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. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1535470 Title: Backlight brightness keys not working To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1535470/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
