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[nmvictor <568611@xxxxxxxxxxxxxxxxxx>]

I installed the kernel but on booting,I was greeted with a black screen
after selecting kamals kernel from the boot menu! Thank God I hadn't
removed my previous kernel so i rebooted back into the 2.6.35.23 kernel
and appended the options "acpi_osi=Linux acpi_backlight=vendor" at the
GRUB_CMDLINE_LINUX_DEFAULT key in the /etc/default/grub file. I rebooted
into kamals kernel but the screen was still black I toyed with Fn+LEFT
and  Fn+RIGHT keys which adjust screen brightness on my Acer Aspire
5734z, it worked, the screen slowly gained brightness but I noticed
something weired which judging from this page, it was expected. The
adjustments were inverse, Bright meant Dim and the other way round. I
had also checked "Dim when Idle" option in my System>Preference>Power
Management and so something else, when Idle, the screen brightens! All
this is weired but many thanks to Kamal Mostafa, at least we have even
the slightest control over screen brightness, my eyes are photophobic so
you can imagine what this bug-fix means to me. I read somewhere in
ubuntu forums about trying to remove gnome power manager at start up
then starting it up manually at the command line as a workaround for the
black screen at start up, well that seems like a huge sacrifice so I
haven't tried it but lest I'm forced to, I'll let you guys know of my
findings.

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

Title:
  Screen brightness control fails on Dell Studio 1558