https://bugzilla.kernel.org/show_bug.cgi?id=214899 --- Comment #22 from Hans de Goede (jwrdegoede@xxxxxxxxxxxxxxxxx) --- Sorry for the slow reply (note I'm afraid my next reply will likely also be a bit slow). Good find on the methods, so this means that the key-press events are supposed to come from the "Video Bus" device and as you point out for some reason this is not happening. I guess that the drivers/acpi/acpi_video.c is not making some call to enable the events which your laptop requires; or it is making a call which it should not make which disables the events... One thing which I just noticed is that when passing acpi_backlight=video you get 2 acpi_video# backlight devices. Given that AFAICT your laptop has only a single GPU, may be an indication of a problem. I wonder what happens when you pass: video.only_lcd=1 acpi_backlight=video on the kernel cmdline, I would expect there to only be 1 acpi_video# backlight device under /sys/class/backlight then ? And maybe this also fixes the brightness keys? I assume that without any "acpi_backlight=xxx" on the kernel cmdline you only get the intel_backlight device, right? You could also check to see if adding just "video.only_lcd=1" to the kernel cmdline helps. If that does not help, you may want to play with the acpi_video_bus_DOS() call from drivers/acpi/acpi_video.c . This gets called from the acpi_video_bus_start_devices() function: static int acpi_video_bus_start_devices(struct acpi_video_bus *video) { return acpi_video_bus_DOS(video, 0, acpi_osi_is_win8() ? 1 : 0); } You may want to modify this trying the following: return acpi_video_bus_DOS(video, 3, acpi_osi_is_win8() ? 1 : 0); Looking at your acpidump it seems the second parameter is ignored, so changing that will likely not matter. -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
