Backlight brightness control in Ubuntu 11.10 (Oneiric) -- summary of
known remaining issues:
As noted previously, some Ubuntu 11.10 (Oneiric) systems will still need
to boot with "acpi_backlight=vendor" or some other vendor-specific boot
parameter to make the brightness up/down keys work.
Screensaver blank screen gets stuck off: In Ubuntu 11.10 (Oneiric),
users of Dell Studio 15, Dell Studio 1558, and some other models may
experience the problem LP: #872652 ("screensaver backlight stuck off,
system looks hung"). If you find that your backlight gets stuck off
when the screensaver blanks the screen, see that bug number for the fix.
Some (all?) systems with Intel GMA4500-based graphics processors have
their brightness controls "inverted" such that the brightness-down key
increases the brightness and vice versa. This also results in the
system starting with its brightness set to minimum (or even "off") when
the system first boots. This problem is tracked by LP: #752165, LP:
#765438, LP: #773471.
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https://bugs.launchpad.net/bugs/568611
Title:
Screen brightness control fails on Dell Studio 1558
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