$: cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=450425e4-b41a-441e-9d3e-1af04189e5a2 ro quiet splash vt.handoff=7
$; /sys/class/backlight
acpi_video0 intel_backlight
$: cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=450425e4-b41a-441e-9d3e-1af04189e5a2 ro quiet splash vt.handoff=7
$; /sys/class/backlight
acpi_video0 intel_backlight
Hi
Sorry. Please repeat the commands in my last post #10 but instead of using ...
please useCode:sudo updategrub
I have a sticky keyboard that needs cleaningCode:sudo update-grub
I have edited post #10
Kind regards
Last edited by matt_symes; October 22nd, 2011 at 02:21 PM.
If you believe everything you read, you better not read. ~ Japanese Proverb
If you don't read the newspaper, you're uninformed. If you read the newspaper, you're mis-informed. - Mark Twain
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hi matt_symes, thanks... its working...great effort ....thanks again...
Hi
Your welcome . Please could you mark this thread as solved.
Kind regards
If you believe everything you read, you better not read. ~ Japanese Proverb
If you don't read the newspaper, you're uninformed. If you read the newspaper, you're mis-informed. - Mark Twain
Thinking about becoming an Ubuntu Member?
Sorry for reviving a week old topic, but I'm having a similar problem.
My /sys/class/backlight/ contains the folders acpi_video0 and acpi_video1
I've determined that acpi_video0 is able to change my backlight through
sudo bash -c "echo 6 > /sys/class/backlight/acpi_video0/brightness"
But acpi_video1 doesn't do anything
Is there a way I can blacklist just one of them?
I've already tried just about every solution I've come across, but none of them work.
When I try the fix from those post my backlight just stays at 100% no matter what. And there are no files in my /sys/class/backlight folder.
Hi
Open a terminal and type
Post back results and also the results ofCode:sudo modprobe -r video
Kind regardsCode:ls /sys/class/backlight
If you believe everything you read, you better not read. ~ Japanese Proverb
If you don't read the newspaper, you're uninformed. If you read the newspaper, you're mis-informed. - Mark Twain
Thinking about becoming an Ubuntu Member?
After I add the lines to my /etc/default/grub file and update grub, my /sys/class/backlight folder become empty.
Even after running modprobe -r video, the backlight remains unchangable. Do the ati drivers use a different directory for the backlight?
Hi
If your backlight folder is empty after adding the kernel command line then this means it has not loaded the backlight kernel module for your laptop.
What is the exact make and model of your laptop ?
Also now that the default backlight folder is empty open a terminall and type
This will reload the backlight video kernel modue. How many entries do you have in your backlight folder ?Code:sudo modprobe video
Does this lower your backlight brightness ?
If this works then we need to find out why two video module nodes are being created.Code:echo 5 | sudo tee /sys/class/backlight/acpi_video0/brightness
Kind regards
Last edited by matt_symes; November 2nd, 2011 at 12:25 PM.
If you believe everything you read, you better not read. ~ Japanese Proverb
If you don't read the newspaper, you're uninformed. If you read the newspaper, you're mis-informed. - Mark Twain
Thinking about becoming an Ubuntu Member?
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