Backlight not working in Ubuntu 10.10

Try adding the boot option:

acpi_backlight=vendor

May help

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/428910

i'm sorry, but specifically where do i add the boot option?

If you run

gksudo gedit /etc/default/grub

you can add it inside the quotes with the default:

quiet splash

options. Save the file. Close gedit and run:

sudo update-grub

reboot to test

i replaced 'quiet splash' with 'acpi_backlight=vendor' but it did not result in anything other than a slower boot. However i noticed that im able to adjust brightness directly after booting, i don't know if this means something...

ok re-edit the file and change:

acpi_backlight=vendor

to

quiet splash acpi_backlight=vendor

and rerun the: sudo update-grub command

And you can have all the options. The ability to change the brightness for some time is very interesting. When the ability ceases can you please run:

dmesg | tail -n 20

What is output

Thanks

I edited the file as suggested, and the result now is that the buttons to adjust brightness in power-manager and while i press fn + 'right or left' i completely gone, and the display does not change brightness. I'm sorry, but i mis-formulated. What i ment is that i'm able to adjust the brightness 2-3 seconds after i press the start button, while booting. But anyway, here is the output:

[ 48.180996] cfg80211: Received country IE:
[ 48.181001] cfg80211: Regulatory domain: US
[ 48.181002] (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[ 48.181005] (2402000 KHz - 2482000 KHz @ 40000 KHz), (10000 mBi, 1600 mBm)
[ 48.181007] cfg80211: CRDA thinks this should applied:
[ 48.181009] cfg80211: Regulatory domain: US
[ 48.181010] (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[ 48.181013] (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2700 mBm)
[ 48.181015] (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 1700 mBm)
[ 48.181017] (5250000 KHz - 5330000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 48.181020] (5490000 KHz - 5600000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 48.181022] (5650000 KHz - 5710000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 48.181024] (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 3000 mBm)
[ 48.181026] cfg80211: We intersect both of these and get:
[ 48.181028] cfg80211: Regulatory domain: 98
[ 48.181029] (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[ 48.181031] (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 1600 mBm)
[ 48.181037] cfg80211: Current regulatory domain updated by AP to: US
[ 48.181038] (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[ 48.181041] (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 1600 mBm)

This question was expired because it remained in the 'Open' state without activity for the last 15 days.

I have the same laptop and problem.

Out of the box, the brightness notifier pops up and gets adjusted with the brightness function keys, but the brightness never actually changes.

Adding "acpi_backlight=vendor" to the default grub prevented anything from happening, including the brightness notification.

Not able to temporarily adjust the brightness during boot, however. At least, I don't think so.

This looks similar to this message:
http://<email address hidden>/msg379018.html

I've followed the steps but they did not do anything for me.