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** Changed in: gnome-settings-daemon (Ubuntu)
Importance: Undecided => Low
** Changed in: gnome-settings-daemon (Ubuntu)
Status: Incomplete => New
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-settings-daemon in Ubuntu.
https://bugs.launchpad.net/bugs/1012743
Title:
Unable to adjust backlight brightness
Status in “gnome-settings-daemon” package in Ubuntu:
New
Bug description:
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) = ?
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