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I am unable to change the brightness of my desktop screen using this path.
System settings{top right corner of the screen)>Under Personal Brightness & lock.No option to change brightness is available here.In Ubuntu 11.04 Shift+ +/- key was used to change brightness,the same doesn't work in 12.04.

Also under System settings{top right corner of the screen)>Under Hardware Displays,my monitor is recognized as a Laptop despite me using a desktop!

12.04 brightness

share|improve this question

edited Jun 15 '16 at 6:50

anand mbs

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asked May 4 '12 at 10:09

Harsh ThakarHarsh Thakar

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add a comment
 | 

0

I am unable to change the brightness of my desktop screen using this path.
System settings{top right corner of the screen)>Under Personal Brightness & lock.No option to change brightness is available here.In Ubuntu 11.04 Shift+ +/- key was used to change brightness,the same doesn't work in 12.04.

Also under System settings{top right corner of the screen)>Under Hardware Displays,my monitor is recognized as a Laptop despite me using a desktop!

12.04 brightness

share|improve this question

edited Jun 15 '16 at 6:50

anand mbs

39511 gold badge33 silver badges1616 bronze badges

asked May 4 '12 at 10:09

Harsh ThakarHarsh Thakar

111 silver badge22 bronze badges

add a comment
 | 

I am unable to change the brightness of my desktop screen using this path.
System settings{top right corner of the screen)>Under Personal Brightness & lock.No option to change brightness is available here.In Ubuntu 11.04 Shift+ +/- key was used to change brightness,the same doesn't work in 12.04.

Also under System settings{top right corner of the screen)>Under Hardware Displays,my monitor is recognized as a Laptop despite me using a desktop!

12.04 brightness

share|improve this question

edited Jun 15 '16 at 6:50

anand mbs

39511 gold badge33 silver badges1616 bronze badges

asked May 4 '12 at 10:09

Harsh ThakarHarsh Thakar

111 silver badge22 bronze badges

share|improve this question

edited Jun 15 '16 at 6:50

anand mbs

39511 gold badge33 silver badges1616 bronze badges

asked May 4 '12 at 10:09

Harsh ThakarHarsh Thakar

111 silver badge22 bronze badges

share|improve this question

edited Jun 15 '16 at 6:50

anand mbs

39511 gold badge33 silver badges1616 bronze badges

asked May 4 '12 at 10:09

Harsh ThakarHarsh Thakar

111 silver badge22 bronze badges

edited Jun 15 '16 at 6:50

anand mbs

39511 gold badge33 silver badges1616 bronze badges

edited Jun 15 '16 at 6:50

anand mbs

39511 gold badge33 silver badges1616 bronze badges

asked May 4 '12 at 10:09

Harsh ThakarHarsh Thakar

111 silver badge22 bronze badges

asked May 4 '12 at 10:09

Harsh ThakarHarsh Thakar

111 silver badge22 bronze badges

3 Answers
3

active

oldest

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0

in acer aspire 5741 I add edit in GRUB_CMDLINE_LINUX to :

GRUB_CMDLINE_LINUX="quiet splash pcie_aspm=force i915.i915_enable_rc6=1 acpi_osi=Linux acpi_backlight=vendor"

and it is work well

share|improve this answer

edited Oct 8 '12 at 16:36

penreturns

5,52844 gold badges2727 silver badges4343 bronze badges

answered Oct 8 '12 at 15:50

beshoy abdelmaseh mekhailbeshoy abdelmaseh mekhail

23122 silver badges33 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Only the acpi_backlight=vendor part is important. The rest allies only to your system, which the OP may not have.
  
  – ζ--
  Oct 8 '12 at 17:05
  

  
  
  
  

add a comment
 | 

0

Give this a try

sudo gedit /etc/default/grub

Find the line line

GRUB_CMDLINE_LINUX=""

and change it to

GRUB_CMDLINE_LINUX="acpi_osi=Linux"

Update your GRUB

sudo update-grub

Restart your system . Hope this works with you

I used to have the same problem and trying this half solved the problem , the directions work opposite but the brightness works...kind of workaround

share|improve this answer

edited Dec 31 '13 at 12:23

Avinash Raj

61.5k4646 gold badges179179 silver badges229229 bronze badges

answered May 4 '12 at 11:46

mviswamviswa

4744 bronze badges

add a comment
 | 

0

A very easy way to fix that is by using the System Settings and just changing the brightness from there I used to have the same problem but I was able to fix it in the System Settings

Hope this he

share|improve this answer

answered Jun 15 '16 at 6:41

user487038user487038

add a comment
 | 

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0

in acer aspire 5741 I add edit in GRUB_CMDLINE_LINUX to :

GRUB_CMDLINE_LINUX="quiet splash pcie_aspm=force i915.i915_enable_rc6=1 acpi_osi=Linux acpi_backlight=vendor"

and it is work well

share|improve this answer

edited Oct 8 '12 at 16:36

penreturns

5,52844 gold badges2727 silver badges4343 bronze badges

answered Oct 8 '12 at 15:50

beshoy abdelmaseh mekhailbeshoy abdelmaseh mekhail

23122 silver badges33 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Only the acpi_backlight=vendor part is important. The rest allies only to your system, which the OP may not have.
  
  – ζ--
  Oct 8 '12 at 17:05
  

  
  
  
  

add a comment
 | 

0

in acer aspire 5741 I add edit in GRUB_CMDLINE_LINUX to :

GRUB_CMDLINE_LINUX="quiet splash pcie_aspm=force i915.i915_enable_rc6=1 acpi_osi=Linux acpi_backlight=vendor"

and it is work well

share|improve this answer

edited Oct 8 '12 at 16:36

penreturns

5,52844 gold badges2727 silver badges4343 bronze badges

answered Oct 8 '12 at 15:50

beshoy abdelmaseh mekhailbeshoy abdelmaseh mekhail

23122 silver badges33 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Only the acpi_backlight=vendor part is important. The rest allies only to your system, which the OP may not have.
  
  – ζ--
  Oct 8 '12 at 17:05
  

  
  
  
  

add a comment
 | 

in acer aspire 5741 I add edit in GRUB_CMDLINE_LINUX to :

GRUB_CMDLINE_LINUX="quiet splash pcie_aspm=force i915.i915_enable_rc6=1 acpi_osi=Linux acpi_backlight=vendor"

and it is work well

share|improve this answer

edited Oct 8 '12 at 16:36

penreturns

5,52844 gold badges2727 silver badges4343 bronze badges

answered Oct 8 '12 at 15:50

beshoy abdelmaseh mekhailbeshoy abdelmaseh mekhail

23122 silver badges33 bronze badges

GRUB_CMDLINE_LINUX="quiet splash pcie_aspm=force i915.i915_enable_rc6=1 acpi_osi=Linux acpi_backlight=vendor"

share|improve this answer

edited Oct 8 '12 at 16:36

penreturns

5,52844 gold badges2727 silver badges4343 bronze badges

answered Oct 8 '12 at 15:50

beshoy abdelmaseh mekhailbeshoy abdelmaseh mekhail

23122 silver badges33 bronze badges

edited Oct 8 '12 at 16:36

penreturns

5,52844 gold badges2727 silver badges4343 bronze badges

edited Oct 8 '12 at 16:36

penreturns

5,52844 gold badges2727 silver badges4343 bronze badges

answered Oct 8 '12 at 15:50

beshoy abdelmaseh mekhailbeshoy abdelmaseh mekhail

23122 silver badges33 bronze badges

answered Oct 8 '12 at 15:50

beshoy abdelmaseh mekhailbeshoy abdelmaseh mekhail

23122 silver badges33 bronze badges

0

Give this a try

sudo gedit /etc/default/grub

Find the line line

GRUB_CMDLINE_LINUX=""

and change it to

GRUB_CMDLINE_LINUX="acpi_osi=Linux"

Update your GRUB

sudo update-grub

Restart your system . Hope this works with you

I used to have the same problem and trying this half solved the problem , the directions work opposite but the brightness works...kind of workaround

share|improve this answer

edited Dec 31 '13 at 12:23

Avinash Raj

61.5k4646 gold badges179179 silver badges229229 bronze badges

answered May 4 '12 at 11:46

mviswamviswa

4744 bronze badges

add a comment
 | 

0

Give this a try

sudo gedit /etc/default/grub

Find the line line

GRUB_CMDLINE_LINUX=""

and change it to

GRUB_CMDLINE_LINUX="acpi_osi=Linux"

Update your GRUB

sudo update-grub

Restart your system . Hope this works with you

I used to have the same problem and trying this half solved the problem , the directions work opposite but the brightness works...kind of workaround

share|improve this answer

edited Dec 31 '13 at 12:23

Avinash Raj

61.5k4646 gold badges179179 silver badges229229 bronze badges

answered May 4 '12 at 11:46

mviswamviswa

4744 bronze badges

add a comment
 | 

Give this a try

sudo gedit /etc/default/grub

Find the line line

GRUB_CMDLINE_LINUX=""

and change it to

GRUB_CMDLINE_LINUX="acpi_osi=Linux"

Update your GRUB

sudo update-grub

Restart your system . Hope this works with you

I used to have the same problem and trying this half solved the problem , the directions work opposite but the brightness works...kind of workaround

share|improve this answer

edited Dec 31 '13 at 12:23

Avinash Raj

61.5k4646 gold badges179179 silver badges229229 bronze badges

answered May 4 '12 at 11:46

mviswamviswa

4744 bronze badges

sudo gedit /etc/default/grub

GRUB_CMDLINE_LINUX=""

GRUB_CMDLINE_LINUX="acpi_osi=Linux"

sudo update-grub

share|improve this answer

edited Dec 31 '13 at 12:23

Avinash Raj

61.5k4646 gold badges179179 silver badges229229 bronze badges

answered May 4 '12 at 11:46

mviswamviswa

4744 bronze badges

edited Dec 31 '13 at 12:23

Avinash Raj

61.5k4646 gold badges179179 silver badges229229 bronze badges

edited Dec 31 '13 at 12:23

Avinash Raj

61.5k4646 gold badges179179 silver badges229229 bronze badges

answered May 4 '12 at 11:46

mviswamviswa

4744 bronze badges

answered May 4 '12 at 11:46

mviswamviswa

4744 bronze badges