Public bug reported:
Binary package hint: hal
Since Intrepid Gnome has found a new way of setting brightness on my
laptop (Dell Latitude D630) which interferes with the FN-buttons and the
old libsmbios way.
I don't know how it does it, since ACPI does not support brightness setting on
my model:
cat /proc/acpi/video/VID*/LCD/brightness
<not supported>
<not supported>
The brightness applet now works decently. It has many different possible
levels and change of brightness is continuous, though not immediate and
responsive. On hardy it worked with 8 levels of brightness, but maybe a
little smother.
Changing trough the FN-keys is a different story:
It takes 9 key strokes to go from maximum to minimum brightness,
the brightness level indicator that pops out on the screen has 20 steps.
On the contrary going from minimum to maximum requires all the 20 steps, even
though some of them, especially the first 4, don't seem to do anything.
This mismatch causes confusion and weird behaviour of gnome-power-manager, as
the effective brightness is different than the reported brightness. Basically
the screen is never bright exactly as you want it to be... the whole thing is
just "buggy".
I tried using dellLcdBrightness and found out that it gets confused too.
It only has 8 possible levels.
It's hard to fully explain, but basically I can easily have gnome think
that brightness is 100% when it is actually at minimum or viceversa.
That goes for dellLcdBrightness as well.
A quick way to fix this is to revert to the old libsmbios based mode of
handling this model's brightness, though it had only 8 levels and did
not work with a BIOS password.
** Affects: gnome-power
Importance: Undecided
Status: New
** Affects: libsmbios
Importance: Undecided
Status: New
** Affects: hal (Ubuntu)
Importance: Undecided
Status: New
** Tags: dell intrepid latitude regression
** Also affects: libsmbios
Importance: Undecided
Status: New
** Also affects: gnome-power
Importance: Undecided
Status: New
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Hardware and software don't agree on brightness level
https://bugs.launchpad.net/bugs/295560
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