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 Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1535470 Title: Backlight brightness keys not working Status in linux package in Ubuntu: Confirmed Bug description: 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 chipset. Backlight function keys are not working. I have tried various combinations of: acpi_osi=Linux acpi_backlight=native acpi_osi=Linux acpi_backlight=vendor acpi_osi=! acpi_backlight=vendor etc, etc with no luck. --- ApportVersion: 2.19.1-0ubuntu5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ian 2218 F.... pulseaudio CurrentDesktop: Unity DistroRelease: Ubuntu 15.10 HibernationDevice: RESUME=UUID=df036c01-8f22-4d8f-ad55-6add4f99f5f4 Lsusb: 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 RelatedPackageVersions: linux-restricted-modules-4.4.0-0-generic N/A linux-backports-modules-4.4.0-0-generic N/A linux-firmware 1.155 Tags: wily 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 _MarkForUpload: True dmi.bios.date: 11/20/2015 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1.05.10 dmi.board.asset.tag: Tag 12345 dmi.board.name: P65_P67RGRERA dmi.board.vendor: Notebook dmi.board.version: Not Applicable dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: Notebook dmi.chassis.version: N/A dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.05.10:bd11/20/2015:svnNotebook:pnP65_P67RGRERA:pvrNotApplicable:rvnNotebook:rnP65_P67RGRERA:rvrNotApplicable:cvnNotebook:ct10:cvrN/A: dmi.product.name: P65_P67RGRERA dmi.product.version: Not Applicable dmi.sys.vendor: Notebook To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1535470/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
