unable to control brightness ( Sony viao . Modal :SVE15115ENW)

Asked by Koti Reddy on 2012-10-31

Hi
I installed ubuntu 12.10 .Through wubi .
Every thing was fine . But i can't able to adjust my screen brightness (
Sony vaio . Modal :SVE15115ENW)
Could you plz help me with this problem .

Regards
B.koti

Question information

Language:
English Edit question
Status:
Expired
For:
Ubuntu acpi Edit question
Assignee:
No assignee Edit question
Last query:
2012-11-22
Last reply:
2012-12-07
N1ck 7h0m4d4k15 (nicktux) said : #1

Hi ,

have your tried the kernel parameters

acpi_osi=

or

acpi_backligt=vendor

?

Have a look here :
http://ubuntuforums.org/showthread.php?t=1613132

and try to pass these parameters through grub to kernel and see

Thanks

Try:

sudo modprobe sonypi

See if it then works.

Source:
https://help.ubuntu.com/community/SonyVaioBrightness

Koti Reddy (koti-aero) said : #3

HI
I tried following steps . But helpless to me .
1.

gksudo gedit /etc/default/grub

2.

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=""

3.

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 nomodeset"*
GRUB_CMDLINE_LINUX=""

4.

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_osi=\"Linux\""

5.

sudo update-grub

6.sudo reboot.

I followed all this steps . There is no change .

Could you plz help me with this problem.

Regards
B.koti

On Thu, Nov 1, 2012 at 1:01 AM, marcobra (Marco Braida) <
<email address hidden>> wrote:

> Your question #212821 on acpi in Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/acpi/+question/212821
>
> Project: Ubuntu => acpi in Ubuntu
>
> --
> You received this question notification because you asked the question.
>

Change it to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

Don't forget to run:

sudo update-grub

after the edit, reboot to test

Koti Reddy (koti-aero) said : #5

Hi
After following below steps

1.GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

 2.sudo update-grub

 . My Brightness indicator is not displaying . There is no change .

PLZ give me any other solution to correct my problem

Regards
B.koti

On Thu, Nov 1, 2012 at 6:21 PM, actionparsnip <
<email address hidden>> wrote:

> Your question #212821 on acpi in Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/acpi/+question/212821
>
> Status: Open => Answered
>
> actionparsnip proposed the following answer:
> Change it to:
>
> GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
>
> Don't forget to run:
>
> sudo update-grub
>
> after the edit, reboot to test
>
> --
> If this answers your question, please go to the following page to let us
> know that it is solved:
>
> https://answers.launchpad.net/ubuntu/+source/acpi/+question/212821/+confirm?answer_id=3
>
> If you still need help, you can reply to this email or go to the
> following page to enter your feedback:
> https://answers.launchpad.net/ubuntu/+source/acpi/+question/212821
>
> You received this question notification because you asked the question.
>

If you run:

echo 400 | sudo tee /sys/class/backlight/intel_backlight/brightness > /dev/null

does it change the brightness?

Koti Reddy (koti-aero) said : #7

Hi
This the result i got . By using
echo 400 | sudo tee /sys/class/backlight/intel_
>
> backlight/brightness >
> /dev/null

bash: syntax error near unexpected token `newline'
sony@ubuntu:~$ /dev/null
bash: /dev/null: Permission denied

PLZ help me with this error

Regards
B.koti

On Fri, Nov 2, 2012 at 6:41 PM, actionparsnip <
<email address hidden>> wrote:

> Your question #212821 on acpi in Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/acpi/+question/212821
>
> Status: Open => Needs information
>
> actionparsnip requested more information:
> If you run:
>
> echo 400 | sudo tee /sys/class/backlight/intel_backlight/brightness >
> /dev/null
>
> does it change the brightness?
>
> --
> To answer this request for more information, you can either reply to
> this email or enter your reply at the following page:
> https://answers.launchpad.net/ubuntu/+source/acpi/+question/212821
>
> You received this question notification because you asked the question.
>

Copy the command as ONE command, don't chop it up as you dide

Koti Reddy (koti-aero) said : #9

Hi
After running this command .
echo 400 | sudo tee /sys/class/backlight/intel_backlight/brightness >
/dev/null

My result is
tee: /sys/class/backlight/intel_backlight/brightness: No such file or
directory

Regards .
B.koti

On Fri, Nov 2, 2012 at 10:35 PM, actionparsnip <
<email address hidden>> wrote:

> Your question #212821 on acpi in Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/acpi/+question/212821
>
> Status: Open => Answered
>
> actionparsnip proposed the following answer:
> Copy the command as ONE command, don't chop it up as you dide
>
> --
> If this answers your question, please go to the following page to let us
> know that it is solved:
>
> https://answers.launchpad.net/ubuntu/+source/acpi/+question/212821/+confirm?answer_id=7
>
> If you still need help, you can reply to this email or go to the
> following page to enter your feedback:
> https://answers.launchpad.net/ubuntu/+source/acpi/+question/212821
>
> You received this question notification because you asked the question.
>

N1ck 7h0m4d4k15 (nicktux) said : #10

On 11/02/2012 07:15 PM, Koti Reddy wrote:
> Question #212821 on acpi in Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/acpi/+question/212821
>
> Status: Answered => Open
>
> Koti Reddy is still having a problem:
> Hi
> After running this command .
> echo 400 | sudo tee /sys/class/backlight/intel_backlight/brightness >
> /dev/null
>
> My result is
> tee: /sys/class/backlight/intel_backlight/brightness: No such file or
> directory
>
> Regards .
> B.koti
>
Give the results of

~$ ls /sys/class/backlight/*/

Thanks

Koti Reddy (koti-aero) said : #11

Hi
Result of
ls /sys/class/backlight/
 ....is
acpi_video0

Regards
B.koti

On Fri, Nov 2, 2012 at 10:56 PM, NikTh <<email address hidden>
> wrote:

> Your question #212821 on acpi in Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/acpi/+question/212821
>
> Status: Open => Answered
>
> NikTh proposed the following answer:
> On 11/02/2012 07:15 PM, Koti Reddy wrote:
> > Question #212821 on acpi in Ubuntu changed:
> > https://answers.launchpad.net/ubuntu/+source/acpi/+question/212821
> >
> > Status: Answered => Open
> >
> > Koti Reddy is still having a problem:
> > Hi
> > After running this command .
> > echo 400 | sudo tee /sys/class/backlight/intel_backlight/brightness >
> > /dev/null
> >
> > My result is
> > tee: /sys/class/backlight/intel_backlight/brightness: No such file or
> > directory
> >
> > Regards .
> > B.koti
> >
> Give the results of
>
> ~$ ls /sys/class/backlight/*/
>
> Thanks
>
> --
> If this answers your question, please go to the following page to let us
> know that it is solved:
>
> https://answers.launchpad.net/ubuntu/+source/acpi/+question/212821/+confirm?answer_id=9
>
> If you still need help, you can reply to this email or go to the
> following page to enter your feedback:
> https://answers.launchpad.net/ubuntu/+source/acpi/+question/212821
>
> You received this question notification because you asked the question.
>

Launchpad Janitor (janitor) said : #12

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

Koti Reddy (koti-aero) said : #13

Hi could you please help me the above problem . Still facing my problem .

Regards
B.koti

Koti Reddy (koti-aero) said : #14

~$ ls /sys/class/backlight/*/

The result of above commend is
actual_brightness bl_power brightness device max_brightness power subsystem type uevent

Could you plz help me . With this problem .

Regards
B.koti

Koti Reddy (koti-aero) said : #15

Hi
could you please give me reply .

Regards
B.koti

On Tue, Nov 20, 2012 at 9:31 AM, Koti Reddy <
<email address hidden>> wrote:

> Your question #212821 on acpi in Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/acpi/+question/212821
>
> You gave more information on the question:
> ~$ ls /sys/class/backlight/*/
>
> The result of above commend is
> actual_brightness bl_power brightness device max_brightness power
> subsystem type uevent
>
>
> Could you plz help me . With this problem .
>
> Regards
> B.koti
>
> --
> You received this question notification because you asked the question.
>

Launchpad Janitor (janitor) said : #16

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