Unable to adjust brightness in Sony Vaio - VPCEG3AEN

[rameshiit19]

I have installed Linux Mint 14 (Nadia) in my Sony Vaio Laptop (Model - VPCEG3AEN) . I am unable to adjust brightness in my laptop with function keys and software as well . I am a newbie to Mint and have searched this forum but couldn't find appropriate fix . How can I resolve it ?

[viking777]

If there is a laptop somewhere where the brightness function keys work on Linux then I have never owned it, so best forget about that method. For me the brightness in the 'Brightness and Lock' menu works but for others it doesn't. You could try xbacklight from the terminal, that usually works (you might have to install it first).

Code: Select all

xbacklight -dec 40

to decrease brightness by 40%

Code: Select all

xbacklight -inc 40

to increase it by 40%. You can vary the number to suit yourself, the larger the number the bigger the effect.

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xbacklight

on its own will show you the current setting.

To automate that open the keyboard menu item, select custom shortcuts and add keyboard shortcuts as follows:

Name: Brightness Up
Command: xbacklight -inc 40

Name: Brightness Down
Command: xbacklight -dec 40

Choose whatever keyboard shortcuts you want (but not the brightness keys because they don't work) I use Ctl/Shift/+ (well it is = actually because + is upper case) and Ctl/Shift/- .

[rameshiit19]

If there is a laptop somewhere where the brightness function keys work on Linux then I have never owned it, so best forget about that method. For me the brightness in the 'Brightness and Lock' menu works but for others it doesn't. You could try xbacklight from the terminal, that usually works (you might have to install it first).

Code: Select all

xbacklight -dec 40

to decrease brightness by 40%

Code: Select all

xbacklight -inc 40

to increase it by 40%. You can vary the number to suit yourself, the larger the number the bigger the effect.

Code: Select all

xbacklight

on its own will show you the current setting.

To automate that open the keyboard menu item, select custom shortcuts and add keyboard shortcuts as follows:

Name: Brightness Up
Command: xbacklight -inc 40

Name: Brightness Down
Command: xbacklight -dec 40

Choose whatever keyboard shortcuts you want (but not the brightness keys because they don't work) I use Ctl/Shift/+ (well it is = actually because + is upper case) and Ctl/Shift/- .

I have tried to adjust screen brightness with the commands mentioned but it's not getting adjusted.

[viking777]

You did read this bit did you?

you might have to install it first (xbacklight that is)

[rameshiit19]

You did read this bit did you?

you might have to install it first (xbacklight that is)

I am getting message as package xbacklight already installed. But brightness is not getting adjusted.

[Dirk2013]

Hi,

I'm having the same issue with my Acer Travelmate P643, I can not adjust my back light, neither with the system settings brightness and lock, nor with xbacklight (it is installed)

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dirk@Asterix-Linux ~ $ inxi -f -M -R -S -G
System:    Host: Asterix-Linux Kernel: 3.5.0-17-generic i686 (32 bit) Desktop: Gnome Distro: Linux Mint 14 Nadia
Machine:   Mobo: Acer model: TravelMate P643-M version: V1.10 Bios: Phoenix version: V1.10 date: 06/27/2012
CPU:       Dual core Intel Core i5-3210M CPU (-HT-MCP-) cache: 3072 KB
           Clock Speeds: 1: 1200.00 MHz 2: 1200.00 MHz 3: 1200.00 MHz 4: 2501.00 MHz
           CPU Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts
           acpi mmx fxsr sse sse2 ss ht tm pbe nx rdtscp lm constant_tsc arch_perfmon pebs bts xtopology nonstop_tsc
           aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt
           tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm ida arat epb xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept
           vpid fsgsbase smep erms
Graphics:  Card-1: Intel 3rd Gen Core processor Graphics Controller
           Card-2: NVIDIA GK107 [GeForce GT 640M]
           X.Org: 1.13.0 drivers: intel (unloaded: fbdev,vesa) Resolution: 1366x768@60.1hz
           GLX Renderer: Mesa DRI Intel Ivybridge Mobile x86/MMX/SSE2 GLX Version: 3.0 Mesa 9.0.2


there is no change in brightness after any change in backlight:

Code: Select all

dirk@Asterix-Linux ~ $ xbacklight
88.888889
dirk@Asterix-Linux ~ $ xbacklight -dec 30
dirk@Asterix-Linux ~ $ xbacklight
55.555556
dirk@Asterix-Linux ~ $ xbacklight -inc 30
dirk@Asterix-Linux ~ $ xbacklight -inc 30
dirk@Asterix-Linux ~ $ xbacklight
100.000000


UPDATE:
just found this post:
https://bugs.launchpad.net/ubuntu/+sour ... bug/997901

works perfectly on my Acer, it was always on lowest brightness

Hello, my screen is always set on maximum brightness and I cannot change it. When I press Fn+Left or Right - I see the indicator, changing brightness, but nothing changes.

WORKAROUND: Open terminal and type:
sudo vi /etc/default/grub

Look for the following line:
GRUB_CMDLINE_LINUX_DEFAULT=”quite splash“

Press insert key for edit mode add “acpi_osi=” to the list as shown below:
GRUB_CMDLINE_LINUX_DEFAULT=”quite splash acpi_osi=”

Press Esc key and :wq to save the file and run the following command to update the grub:
sudo update-grub

Reboot your laptop for screen brightness adjustment to work.

[roblm]

Have anyone tried using the "indicator-brightness" program.
In the Terminal type each command and press Enter.

sudo add-apt-repository ppa:indicator-brightness/ppa
sudo apt-get update
sudo apt-get install indicator-brightness

rameshiit19,
did you try the solution Dirk2013 gave? If it didn't work, then try changing the line
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to one of the following lines.

GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash acpi_osi=Linux”
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
GRUB_CMDLINE_LINUX_DEFAULT="quite splash acpi_osi=Linux acpi_backlight=vendor"
GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash nomodeset acpi_backlight=vendor”

Then open the Terminal and run the command "sudo update-grub". Reboot and test your keyboard function keys.