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i have already tried using both the proprietary ATI drivers present under other softwares even downloaded it and tried to set up but everything failed. BTW it support is not only broken in ubuntu,...

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""
No change and 1 interface(acpi_video0)


GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX="acpi_backlight=vendor"
No...

I am extremely sorry not to add that. Yeah brightness still at maximum and it is not changing with "acpi_osi=" parameter.

No i don't have any other interface other than acpi_video0.

How to...

output of cat /proc/cmdline


BOOT_IMAGE=/boot/vmlinuz-3.5.0-17-generic root=UUID=706abb01-8cff-48d5-86d6-4812dc2e86ad ro acpi_osi= quiet splash vt.handoff=7


output of sudo lspci -vnn | grep...

I did add the entry as you said but nothing happened, brightness is still at maximum. The only change is now the brightness slider is not showing up when i am increasing or decreasing the brightness.

i tried 13.04 with nomodeset parameter to kernal then it opened in the commad line mode i.e with no GUI.

Don't buy it, its doesn't support 12.10 or 13.04, i have a older version so at least able to get display work but brightness is still at 100%. Its proprietary drivers are also bugged and won't work.

i added the entry to /etc/default/grub


The contents of /etc/default/grub
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of...

One thing to add that i am using 12.10 old build(february or march) , in the latest build no display showiing at all(when i trying ubuntu without installing), only a flickering line of 5 pixel height...

Brightness key down is pressed
video LCD 00000087 00000000
video VGA 00000081 00000000

Brightness Key up is pressed
video LCD 00000086 00000000
video VGA 00000081 00000000

No manually...

I have tried both the proprietary drivers(fglrx) given under Software sources->Additional drivers then computer opens in command line mode. I have tried all

I have also tried manually installing...