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[Matías Albanesi <568611@xxxxxxxxxxxxxxxxxx>]

Hi Kamal, today I upgraded to Ubuntu Maverick 10.10 from 10.04 and then
upgraded from your previous "i915bri" kernel to this one. I can report
this patch works, but not so well as the former i915bri for Lucid.

My machine is a Toshiba T135-S1310, so it contains an Intel GMA 4500M chip. I had to add "acpi_backlight=vendor" to the kernel parameters.
While booting and before entering Gnome, brightness keys don't work. Just after booting, backlight goes to zero automatically so the screen is absolutely black. Once one brightness key is pressed image can be seen (and then the brightness indicator never reaches zero afterwards). And as you already explained, this patch is not helpful for KDE users.

ls -l /sys/class/backlight:

lrwxrwxrwx 1 root root 0 2011-01-01 21:43 intel_backlight ->
../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight

Can we expect these changes to be applied to the mainstream 10.10
kernel? Or to 10.04 LTS?

Thank you, and thanks for all the work on the i915 driver.

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https://bugs.launchpad.net/bugs/568611

Title:
  Screen brightness control fails on Dell Studio 1558