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I can't change backlight from Gnome, but I can do it with Cinnamon, Mate and Xfce.
I found out that changing backlight with Gnome (both with keys or the slider on the top-right corner) affects
/sys/class/backlight/nv_backlight/brightness
instead of
/sys/class/backlight/intel_backlight/brightness
# manually echoing values to this file, changes display brightness!
I have an Acer 5750g notebook with a Intel integrated GPU (i7 2630qm with HD graphics) and Nvidia discrete GPU (540m).
I tried, without success, all the kernel command line options from: https://wiki.archlinux.org/index.php/ba … ne_options
I found this bug report that is similar to my problem: https://bugzilla.redhat.com/show_bug.cgi?id=1268091
Is this a Gnome bug ? What I should do ? Is there a way to tell Gnome to use the correct path when changing brightness?
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If your issue is DE specific, then it may be the keybinds are incorrect. If you can, look for a keybindings file within gnome, then look for any bind with XF86 in it, as those are more likely to correspond to brightness if I remember correctly. Brightness settings in general should not be tied directly to a DE, so the following may also help: https://wiki.archlinux.org/index.php/Backlight
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Wiki page didn't help much with this problem
I'll search for gnome keybindings! But really I don't know where to start.
Brightness settings in general should not be tied directly to a DE
I thought the same but... Gnome is strange! If I disable the Nvidia GPU from the bios, Gnome works fine (maybe because there is no ambiguity in '/sys/class/backlight/'
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I digged in and found that both Nvidia and Intel GPU are of the same type RAW: now it's explained why changing kernel parameters doesn't have any effect!
Unfortunately the problem is still there.
○ → cat /sys/class/backlight/intel_backlight/type
raw
○ → cat /sys/class/backlight/nv_backlight/type
raw
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In the meantime I found a couple of workarounds:
- Blacklisting the nouveau module fixes the problem (but it's similar to disable the GPU from the bios)
- Installing nvidia proprietary drivers: "/sys/class/backlight" contains only "intel_backlight".
I'm using the first fix because I need the GPU on Windows but I don't need it on Arch.
I guess I'll have to report to Gnome developers to investigate further in the main issue.
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