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I just upgraded these two packages for my Intel HD 3000:
[2011-11-29 17:13] upgraded libgl (7.11.1-1 -> 7.11.2-1)
[2011-11-29 17:13] upgraded intel-dri (7.11.1-1 -> 7.11.2-1)
And afterwards this file into which I used to echo brigthness values has disappeared:
/sys/class/backlight/acpi_video0/brightness
I failed to find any relevant information on http://dri.freedesktop.org/.
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