Hi,

Mine is DualCore T4300, 3072MB 800MHz Dual Channel DDR2, Intel GMA
4500MHD, Dell Wireless 1397, BIOS A09.

Thermal sensors work with 2.6.31, fail with 2.6.32 and 2.6.33
Brightness, eject and lid work with 2.6.32 and 2.6.33, fail with 2.6.31

I think BIOS is a crucial point here. Originally I had A08 which was
full of ACPI related bugs. Some weeks ago I upgraded to A09, which also
has many (7 warnings, 3 remarks, 3 optimisations). Interestingly enough,
some days ago A09 was revoked, now I see only A08 on the support site.

@pablox

I think we should open a separate bug report for the thermal problems of
Lucid's kernel. That is not immediately related to the original problem;
and Lucid's kernel has no brightness, lid, etc. problems.

@adashrath

Did you get the result after resume? Which kernel version?

-- 
Dell Studio 1555: cannot change display brightness after a while, other hotkeys 
and ACPI stuff begin to fail
https://bugs.launchpad.net/bugs/392812
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