Arch Linux

musasabi

Member

From: Chicago, IL

Registered: 2011-06-23

Posts: 63

Asus U50A Brightness Schizophrenia

A fresh install of Arch on my laptop reveals a few things: particularly, backlight brightness is completely hardware controlled. I've been able to turn down the brightness on the most bare terminal install with Arch and Gentoo for a while. This "feature" becomes an issue in Gnome, though, because I cannot figure out how to make Gnome aware of the laptop's brightness.

When left to it's own devices, the brightness will reset to 100% after a few seconds no matter what I set it to. Also, if I open up the "Screen" dialog under Gnome shell's settings and try to adjust the levels (which read at 0%), the slider literally just starts going nuts, all on its own, and forever. It starts sliding down slowly, then jumps around sporadically, continuing to try back to 0%, but it never quite gets there. It's been dancing around my screen for the past 10 minutes with no end in sight.

...eh?

And just for protocol:

[root@laptop patrick]# lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)

...

[root@laptop patrick]# lsmod | grep asus
asus_laptop            14202  0 
sparse_keymap           3128  1 asus_laptop
rfkill                 15498  3 asus_laptop,cfg80211

...

[root@laptop patrick]# lsmod | grep i915
i915                  647738  3 
drm_kms_helper         27529  1 i915
drm                   181991  4 i915,drm_kms_helper
i2c_algo_bit            5239  1 i915
i2c_core               20165  5 videodev,i915,drm_kms_helper,drm,i2c_algo_bit
intel_agp              10848  1 i915
intel_gtt              14359  3 i915,intel_agp
button                  4510  1 i915
video                  11300  1 i915

Last edited by musasabi (2011-06-23 16:54:25)