Screen brightness on Acer 4810T
Hi.
I've just installed Ubuntu 9.04 on my Acer Aspire 4810Timeline. Everything seems to be working ok, except for the screen brightness. The [Fn]+[Up]/[Down] combination displays the popup and the bar is moving correctly, but the brightness remains the same. I've checked the contents of /proc/acpi/video/OVGA/DD02/brightness which changes accordingly. Anyone who's had the same problem, and knows how to solve it?
Re: Screen brightness on Acer 4810T
Just run this in a terminal, it worked for me on my Acer Timeline 4810TZ-4011 on Linux Mint (which is based on Ubuntu 9.04)
Code:
xrandr --output LVDS --set BACKLIGHT_CONTROL native
I found it here, the advice was given by alvinator@
Hope it'll work for you ;)
Re: Screen brightness on Acer 4810T
This fix works. thanks. But it resets when I restart my laptop. Can I make this change permanent?
Re: Screen brightness on Acer 4810T
Sorry, I forgot that...:oops:
You have to go to System > Preferences > Startup Application Preferences.
Then Click on add. For the name, call it Screen Brightness (or anything you want) and put the code under command. The restart and check if it worked.
Hope you will find your way through. My Ubuntu is in French and I don't know the correct name in English...
Re: Screen brightness on Acer 4810T
Hi.
I have a similar problem with (kind of) the same computer. The exact model is 4810TZ-4013
Running the command does nothing, I'm still unable to change the brighntess
Any ideas? This thing is starting to hurt my eyes :P
Thanks in advance
Re: Screen brightness on Acer 4810T
I updated the BIOS to 2.28, logged into Ubuntu, changed the screen brightness... and it worked!
Well, the bad news is every time I do that, the system locks up =X
EDIT: bricked it trying to downgrade the BIOS, got it back, still no backlight control too, but this time I won't update the BIOS :P
Re: Screen brightness on Acer 4810T
Quote:
Originally Posted by
OrnithO
Just run this in a terminal, it worked for me on my Acer Timeline 4810TZ-4011 on Linux Mint (which is based on Ubuntu 9.04)
Code:
xrandr --output LVDS --set BACKLIGHT_CONTROL native
I found it
here, the advice was given by alvinator@
Hope it'll work for you ;)
Found a workaround for the 5810T on karmic that will persist across reboots:
Add the following to the GRUB_CMD_LINUX_DEFAULT entry in /etc/default/grub: acpi_backlight=vendor
Don't forget to run update-grub.
Re: Screen brightness on Acer 4810T
Quote:
Originally Posted by
coolvibe
Found a workaround for the 5810T on karmic that will persist across reboots:
Add the following to the GRUB_CMD_LINUX_DEFAULT entry in /etc/default/grub: acpi_backlight=vendor
Don't forget to run update-grub.
Uh-oh, I've just installed Karmic, but I don't have a /etc/default/grub file.
Any ideas?
Re: Screen brightness on Acer 4810T
Quote:
Originally Posted by
edd07
Uh-oh, I've just installed Karmic, but I don't have a /etc/default/grub file.
Any ideas?
If you upgraded, you are still using the old GRUB. Just add them to your kopts in the menu.lst in /boot/grub, (don't forget to run update-grub afterwards) or just upgrade to GRUB 2 :)
EDIT: Oh, and KMS might be in the way as well, as it will map your screen to LVDS1 instead of LVDS, so desable that too. You can disable KMS by setting "nomodeset" as a kernel parameter.
Re: Screen brightness on Acer 4810T
Quote:
Originally Posted by
coolvibe
If you upgraded, you are still using the old GRUB. Just add them to your kopts in the menu.lst in /boot/grub, (don't forget to run update-grub afterwards) or just upgrade to GRUB 2 :)
EDIT: Oh, and KMS might be in the way as well, as it will map your screen to LVDS1 instead of LVDS, so desable that too. You can disable KMS by setting "nomodeset" as a kernel parameter.
Ok, I tried to upgrade GRUB and it didn't work (it booted me into a grey screen with a black rectangle on the center of the screen), so I added the option to old-school grub's menu.lst.
So, you're saying KMS will break this solution? Or will I have to do something else when it's enabled?
EDIT: Nevermind, it doesn't work. Seems like my laptop is trying really hard to blind me :-(