[SOLVED] Problem in decreasing display brightness

[Programmer]

I use GNOME 3 and Fedora 16 , I have a problem in decreasing display brightness using Fn+F5
when I do this , display brightness only decrease one level and when I press Fn+F5 more nothing happens and brightness do not change . What should I do ?

Screenshot at : http://easyen.in/wp-content/uploads/...-21-085130.png

[george_toolan]

You should at least tell us what kind of notebook you're using, because this is a function of your notebook and not gnome 3. Maybe wait a couple of seconds and then try again?

You could also decrease the brightness and then boot linux with gnome 3.

[nonamedotc]

In addition to george_toolan's questions - Are you able to decrease the brightness when you use the menus?

[Programmer]

Originally Posted by george_toolan

You should at least tell us what kind of notebook you're using, because this is a function of your notebook and not gnome 3. Maybe wait a couple of seconds and then try again?

You could also decrease the brightness and then boot linux with gnome 3.

What do you mean by notebook ? ( Sorry but I'm new in Linux )
And the problem didn't solved by waiting !

I used to decrease screen brightness with FN+F5 and for increasing I used to FN+F6 and then a notification disappeared in the bottom of the screen and showed the screen brightness level
But now when I do this it's just like that the notification level bar is locked and It does not decrease more after It just decrease one level ( for example 10 to 9 and then doesn't change )

see the screen shot : ( The lowest level I am able to change the screen brightness to it ) : http://easyen.in/wp-content/uploads/...-21-085130.png

[coolarif]

The same problem exists in my notebook too....
It is a lenovo z560 and has nvidia gefore with cuda graphics card .
I installed driver for it ....

During rebooting a logo of nvidia is shown and unfamiliar progress bar is shown.

Usually after installation of fedora , to show the progress of loading of OS , a fedora symbol is shown.

After installing the driver for nvidia graphics card , booting time was increased .

Also the strange progressbar appears and disappears in a few seconds , when i log out . The same is the case when i shutdown or restart the system.

Its also delayed when shutdown and reboot.

Brightness can be decreased not less than one level .....l

[stevea]

Originally Posted by coolarif

The same problem exists in my notebook too....
It is a lenovo z560 and has nvidia gefore with cuda graphics card .

Try loading the thinkpad_acpi module like ...

sudo modprobe thinkpad_acpi
then try the lenovo brightness keys (Fn+Home and Fn+End).

[Programmer]

I don't know how , But it fixed !! Thank you every one

[coolarif]

Originally Posted by stevea

Try loading the thinkpad_acpi module like ...

sudo modprobe thinkpad_acpi
then try the lenovo brightness keys (Fn+Home and Fn+End).

Thanks for the response stevea , I tried it and i got :

[arif@MyLapZ560 ~]$ sudo modprobe thinkpad_acpi
[sudo] password for arif:
arif is not in the sudoers file. This incident will be reported.
[arif@MyLapZ560 ~]$ su
Password:
[root@MyLapZ560 arif]# modprobe thinkpad_acpi
FATAL: Error inserting thinkpad_acpi (/lib/modules/3.3.5-2.fc16.x86_64/kernel/drivers/platform/x86/thinkpad_acpi.ko): No such device
[root@MyLapZ560 arif]#

(in my laptop brightness keys are Fn + up and Fn + down).

I tried to change the brightness even it thrown an error , but it did nothing.

[coolarif]

please i can not decrease brightness please help me .

[stevea]

Hmm - looks like the driver doesn't apply to the Z560, worth a try tho'.

This command as root may show an acpi or drive brightness control
find /sys -name brightness

Then you could
cat /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/brightness
echo 8 > /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/brightness
for example.

Still it points to something wrong with the brightness control tool.

[coolarif]

stevea ! its working i think so

terminal's response :

# find /sys -name brightness
/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight/acpi_video0/brightness
[root@MyLapZ560 arif]# cat /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight/acpi_video0/brightness
10
[root@MyLapZ560 arif]# echo 8 > /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight/acpi_video0/brightness


when i hit the command : echo 8 > /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight/acpi_video0/brightness brightness reduced to a level from which can i increase it . But i cant go below that level. How does it work partially ? !

i think: if we reduce it to very low level then i can regain the controll of changing the brightness of the display....thanks you so much steavea : )....