I tried to test dri support by putting glxinfo | grep direct into the
terminal and got an error:

X Error of failed request:  BadRequest (invalid request code or no such 
operation)
  Major opcode of failed request:  157 (GLX)
  Minor opcode of failed request:  19 (X_GLXQueryServerString)
  Serial number of failed request:  12
  Current serial number in output stream:  12

I tried querying xbacklight and it returned:

12456169.411765
12456169.411765

So i wonder if the brightness applet just failed, i'll try using
xbacklight -set to change the brightness.

-- 
No backlight control on ati sony laptops
https://bugs.launchpad.net/bugs/305672
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