Ubuntu
linux-source-2.6.22 package

  1. Bug #173652
  2. Comment #27

Comment 27 for bug 173652

Revision history for this message
jeannich (jeannich) wrote : Re: unable to adjust screen brightness on recent Sony Vaio notebooks

Right Michael,
And probably those 2 lines could be added in /etc/rc.local till bug #197929[https://bugs.launchpad.net/ubuntu/+source/linux/+bug/197929] (and therefore 176888[https://bugs.launchpad.net/ubuntu/+source/xbacklight/+bug/176888] as a duplicate) isn't solved.
I didn't tried yet but it should work.

By the way about smooth changing matter, I think I have a bug at least on my machine: xbacklight response times is sometime not immediate and in some cases doesn't respect the "time" setting.
I have set "time" to 0 in order to hace an immediate xbacklight change it sometime doesn't work.
This may be another issue: could you check on your machine Michael?

Here is an use case example:
-Push Fn keys 3 times to increase backlight luminosity

Result expected:
-Luminosity is increased 3 times successively by the amount asked (10% with my above script)

Bad result sometime on my computer:
-Luminosity doesn't change for an approximate time of 1 to 2 seconds (it should be immediate) and then suddenly increase luminosity by 3 steps