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I installed arch on my thinkpad x230 and backlight keys (fn+F8 / fn+F9) were not working. According to the wiki page on the x230 this is due to a firmware issue.
To change the backlight with the fn keys i installed acpid and made the steps described in the acpid-wiki-page. It did not work. To solve the problem I installed light-git from AUR. Now at least changing the backlight from terminal with light -U / light -A is working fine. I combined acpid events and light-git and on the first run I could change the screen brightness with the fn keys, but not on every boot.
/etc/acpi/events/bl_u
event=video/brightnessup
action=light -A 10
/etc/acpi/events/bl_d
event=video/brightnessdown
action=light -U 10
I discovered with acpi_listen that sometimes acpi events from fn+F8/F9 are registered and sometimes not. This changes randomly every time I boot my laptop.
I don't understand what creates this behaviour and how I could solve it.
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I have a thinkpad X131e. The Fn F8/F9 keys didn't work either. I experimented with the Kernel command-line options suggested here:
https://wiki.archlinux.org/index.php/Backlight
I didn't do any of the other modifications you tried. I think it was the acpi_backlight=video option that got them working. Might be worth a try.
Last edited by cowlick (2017-03-24 12:22:38)
DELL Inspiron 14-3452, 32GB emmc, 4 GB RAM
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I tried the Kernel parameters but none of them worked for me. But thanks for your help anyway.
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I got the backlight keys working (fn+f8-f9) on my x230 by following the solution of the x230 page of the archlinux wiki
https://wiki.archlinux.org/index.php/Le … ntrol_keys
inside
/etc/default/grub
append
GRUB_CMDLINE_LINUX_DEFAULT
with this parameter
acpi_osi='!Windows 2012'
then regenerate the config file with:
grub-mkconfig -o /boot/grub/grub.cfg
reboot and the backlight keys should be working
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