Solved!
I have a nv5911e, core i5. Ubuntu 10.10
1. Bios updated to v1.22, (this step alone don't solve the problem)
2. I used the kernel form:
https://launchpad.net/~kamalmostafa/+archive/linux-kamal-mjgbacklight
Thanks Kamal!!
3. I added
/etc/default/grub:
GRUB_CMDLINE_LINUX="acpi_backlight=vendor"
4. Run:
sudo update-grub
I have not detected any new problem with kernel or bios change. Not
overheating detected yet
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Screen brightness can not be adjusted in Lucid with Intel Arrandale graphics
https://bugs.launchpad.net/bugs/573984
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