Public bug reported:
Hi,
gsd-backlight-helper seems to make a wrong decision on which backlight
to modify/the correct node is missing. The hotkeys for changing the
screen brightness don't work on MacBook Air using nouveau.
gsd-backlight-helper sets
/sys/devices/virtual/backlight/apple_backlight/brightness which doesn't
change anything.
manually setting the brightness like this
# echo 15 > /sys/class/backlight/nv_backlight/brightness
works well
Package: gnome-settings-daemon
State: installed
Automatically installed: no
Version: 3.4.2-0ubuntu0.1
leaf# strace ./gsd-backlight-helper --set-brightness 15 2>&1 | tail
open("/sys/devices/virtual/backlight/apple_backlight/type", O_RDONLY|O_CLOEXEC)
= 4
read(4, "platform\n", 4096) = 9
close(4) = 0
close(3) = 0
getuid() = 0
geteuid() = 0
open("/sys/devices/virtual/backlight/apple_backlight/brightness", O_WRONLY) = 3
write(3, "15", 2) = 2
close(3) = 0
exit_group(0) = ?
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1012743
Title:
Unable to adjust backlight brightness
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