[Solved]Brightness changing by itself / Samsung brightness

Question

Hello friends,
I have a rather strange issue with my laptop (Samsung NP300V5Z). GNOME or KDE, no difference at all, so I presume it's kernel/hardware related. My brightness maxes out when:
1. In KDE, when I click on the battery widget in systray (which is a known KDE bug) OR totally random.
2. In GNOME 3, totally random.
Using laptop-mode-tools helps a bit, because I choose it over KDE's powerdevil, so the bug is not so visible. One other thing worth mentioning. My Fn keys for brightness work half-way; they will only decrease/increase brightness by 1 (out of 7 max). Sound, wlan, touchpad Fn keys work without problem.
I will provide whatever info you might need.
Arch x64 latest, KDE 4.8, Gnome 3.2.1 kernel 3.2.2-1
Last edited by NekySerbia (2012-03-06 18:32:22)

Answer 1

Something happened and brightness is doing fine now, changing when I want it (except for a known KDE bug). One more thing still bothers me; my hotkeys for brightness are not working.
I opened xev and pressed the combinations, here is the output:
KeyPress event, serial 40, synthetic NO, window 0x1c00001,
root 0xac, subw 0x1c00002, time 470989, (55,54), root:(57,436),
state 0x10, keycode 232 (keysym 0x1008ff03, XF86MonBrightnessDown), same_screen YES,
XLookupString gives 0 bytes:
XmbLookupString gives 0 bytes:
XFilterEvent returns: False
KeyRelease event, serial 40, synthetic NO, window 0x1c00001,
root 0xac, subw 0x1c00002, time 470989, (55,54), root:(57,436),
state 0x10, keycode 232 (keysym 0x1008ff03, XF86MonBrightnessDown), same_screen YES,
XLookupString gives 0 bytes:
XFilterEvent returns: False
KeyPress event, serial 40, synthetic NO, window 0x1c00001,
root 0xac, subw 0x1c00002, time 476305, (55,54), root:(57,436),
state 0x10, keycode 233 (keysym 0x1008ff02, XF86MonBrightnessUp), same_screen YES,
XLookupString gives 0 bytes:
XmbLookupString gives 0 bytes:
XFilterEvent returns: False
KeyRelease event, serial 40, synthetic NO, window 0x1c00001,
root 0xac, subw 0x1c00002, time 476305, (55,54), root:(57,436),
state 0x10, keycode 233 (keysym 0x1008ff02, XF86MonBrightnessUp), same_screen YES,
XLookupString gives 0 bytes:
XFilterEvent returns: False
but nothing happens ;( What can I do to fix this? I can check my brightness level by
cat /sys/class/backlight/acpi_video1/brightness
. There is also 'acpi_video0' but it does nothing.