Brightness adjustment function keys does not work on Asus EeeBook X205TA. The laptop uses Intel Atom Z3735F with embedded Intel HD Graphics.
Please add drm.debug=14 parameter and attach dmesg all the way from early boot to trying to adjust the brightness.
Created attachment 172491 [details] Debug log
However, software brightness adjustment works well.
(In reply to Lubomir Kucera from comment #3) > However, software brightness adjustment works well. That sounds like a problem in acpi (hotkeys not reported) or userspace (key events not received/acted on), not i915. Btw what do you have under /sys/class/backlight? Cc: Aaron
Logs say: [ 5.345260] input: Asus WMI hotkeys as /devices/platform/asus-nb-wmi/input/input6 [ 5.351233] asus_wmi: Backlight controlled by ACPI video driver PS. Why do you have video=SVIDEO-1:d on your kernel command line?
(In reply to Jani Nikula from comment #4) > (In reply to Lubomir Kucera from comment #3) > > However, software brightness adjustment works well. > > That sounds like a problem in acpi (hotkeys not reported) or userspace (key > events not received/acted on), not i915. > > Btw what do you have under /sys/class/backlight? > > Cc: Aaron intel_backlight -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight
(In reply to Jani Nikula from comment #5) > Logs say: > > [ 5.345260] input: Asus WMI hotkeys as > /devices/platform/asus-nb-wmi/input/input6 > [ 5.351233] asus_wmi: Backlight controlled by ACPI video driver > > PS. Why do you have video=SVIDEO-1:d on your kernel command line? Display does not work without video=SVIDEO-1:d.
(In reply to Lubomir Kucera from comment #7) > (In reply to Jani Nikula from comment #5) > > Logs say: > > > > [ 5.345260] input: Asus WMI hotkeys as > > /devices/platform/asus-nb-wmi/input/input6 > > [ 5.351233] asus_wmi: Backlight controlled by ACPI video driver > > > > PS. Why do you have video=SVIDEO-1:d on your kernel command line? > > Display does not work without video=SVIDEO-1:d. That makes no sense since BYT has no SVIDEO.
I have removed video=SVIDEO-1:d and the display works. Hmm, that is interesting, it did not work without the parameter on linux 3.19.2.
acpidump please: # acpidump > acpidump.txt
Created attachment 172611 [details] ACPI dump
It seems that you need asus-wmi or asus-nb-wmi to handle the hotkey: the only ACPI method that I found to send notification is WMNB but I don't see it is called anywhere. And there are many 32bits numbers that the asus-wmi.c seems to recognize them, so please try that two modules.
(In reply to Aaron Lu from comment #12) > It seems that you need asus-wmi or asus-nb-wmi to handle the hotkey: the > only ACPI method that I found to send notification is WMNB but I don't see > it is called anywhere. And there are many 32bits numbers that the asus-wmi.c > seems to recognize them, so please try that two modules. I have tried them already, no effect.
Based on the firmware table, there is nothing we can do in ACPI video driver. I'll move this bug to platform category, maybe they have some idea.
Still not working. #uname -a Linux eee 4.5.0-040500-generic #201603140130 SMP Mon Mar 14 05:46:27 UTC 2016 i686 i686 i686 GNU/Linux
(In reply to Skullnet from comment #15) > Still not working. > #uname -a > Linux eee 4.5.0-040500-generic #201603140130 SMP Mon Mar 14 05:46:27 UTC > 2016 i686 i686 i686 GNU/Linux That's saying it didn't work 8 months ago...