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#1 2013-04-23 16:26:15

donniezazen
Member
From: Salt Lake City
Registered: 2011-06-24
Posts: 671
Website

Backlight Controls Stopped Working with Gnome Shell 3.8

Hello,

I have a clean install of Arch with Gnome 3.8 and backlight control is not working which has worked previously OOB on all versions of Gnome and Arch. Kernel parameters from ThinkPad T420 article didn't work. I have acpid and tp_smapi installed and enabled whereas tp_smapi module loads automatically. I have a Thinkpad T420 with Fn+Home/End to control brightness. I am able to control brightness using gnome menu. All other function keys seems to work fine.

ls /sys/class/backlight/
intel_backlight  thinkpad_screen

Thanks.

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#2 2013-04-24 06:14:18

dkao
Member
Registered: 2013-02-01
Posts: 5

Re: Backlight Controls Stopped Working with Gnome Shell 3.8

Try using these for your kernel parameter instead:

video.brightness_switch_enabled=0 acpi_osi='!Windows 2012'

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#3 2013-04-24 08:50:44

donniezazen
Member
From: Salt Lake City
Registered: 2011-06-24
Posts: 671
Website

Re: Backlight Controls Stopped Working with Gnome Shell 3.8

It was originally working then stopped working and now working again. It's been acting wonky. Thanks.

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