Changing brightness does not work in Ubuntu 11.10 after upgrading.
Hello,
I
After upgrading to Ubuntu 11.10 in my Sony Vaio Laptop(VGN-CS) and using Unity as a desktop environment,increasing and decreasing brightness via fn+f5 and fn+f6 does not worked any more.
I remember that i did not installed any NVIDIA driver in my laptop,
but it seems that Ubunut itself installed it in new version after upgrading to 11.10.
I also test http://ubuntuguide.net/change-screen...ntu-11-0410-10,but it does not work.
I can not worked with my laptop any more because brightness of my
screen is too high now.
Khosro.
Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.
If you open "Additional Drivers", does it say that the NVIDIA driver is currently activated ?
1 Attachment(s)
Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.
Yes ,it is.
I have attached a related screenshot picture.
Khosro.
Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.
Hi
What is the make and model of your latop and graphics card ?
Open a terminal and type
Code:
ls /sys/class/backlight
Copy and paste the results back here.
Then type
and do the same thing.
Lastly
Post back as well.
Kind regards
Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.
Hi matt_symes,
My laptop is Sony Vaio VGN-CS and graphic cards is NVIDIA.
The following is the commands and also output that you asked me to run :
Code:
khosro@khosro-laptop:~$ ls /sys/class/backlight
sony
khosro@khosro-laptop:~$ lsmod | grep video
uvcvideo 72711 0
videodev 93004 1 uvcvideo
v4l2_compat_ioctl32 17083 1 videodev
video 19412 0
khosro@khosro-laptop:~$ cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=0095c4f7-3bae-490d-be19-3f907855199c ro quiet splash vt.handoff=7
Khosro.
Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.
Hi
Open a terminal and type
Code:
sudo nano /etc/default/grub
Enter your password. It will not be echoed to the screen.
Look for the line that says
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
and change it so it says
Code:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
Press ctrl + o to save and ctrl + x to exit.
Then type
Reboot your PC and check your function keys. Post back if it doesn't work.
Edit: Just in case you missed it i have highlighted what you need to enter.
Kind regards
Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.
matt_symes,
I changed what you said,but unfortunately it does not work.:-(
The following is my grub
Code:
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'
GRUB_DEFAULT=0
#GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=vendor"
GRUB_CMDLINE_LINUX=""
# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"
# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console
# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480
# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true
# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"
# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"
Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.
Hi
Try
Code:
acpi_backlight=vendor
and not
and then update grub again.
Kind regards
Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.
Still does not work.](*,)#-o
my grub :
HTML Code:
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'
GRUB_DEFAULT=0
#GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=vendor"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
GRUB_CMDLINE_LINUX=""
# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"
# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console
# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480
# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true
# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"
# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"
Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.
Hi
Lets check something out.
Open a terminal and type
Code:
ls /sys/class/backlight/sony
If you see a file in there called brightness then type
Code:
echo 5 | sudo tee /sys/class/backlight/sony/brightness
Enter your password. It will not be echoed to the screen.
If this lower the brightness the substituting 9 in the command above should set it back.
If there is no brightness file then post the output of
Code:
ls /sys/class/backlight/sony
Post back results.
Kind regards