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#1 2011-01-28 15:19:48

STANKAR
Member
From: Czech Republic
Registered: 2010-11-16
Posts: 47

Cannot change brightness - Acer Aspire One A150

Hi, i tried change brightness via keyboard shortcuts, it works fine, but it has only 10 levels of brightness, where is the value of brightness ?? I found /proc/acpi/video/OVGA/....../brightness, but there is <not supported>. I tried set brightness via xrandr, but with no effect (some errors). Help please ...

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#2 2011-02-06 15:11:14

VitaminJ
Member
Registered: 2009-10-19
Posts: 26

Re: Cannot change brightness - Acer Aspire One A150

How about /sys/class/backlight/?

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#3 2011-02-12 10:31:54

STANKAR
Member
From: Czech Republic
Registered: 2010-11-16
Posts: 47

Re: Cannot change brightness - Acer Aspire One A150

VitaminJ wrote:

How about /sys/class/backlight/?

There are nothing, i looked at /sys and /proc and nothing in these directories sad

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#4 2011-02-12 20:17:07

Novartum
Member
From: Sweden
Registered: 2011-02-03
Posts: 33

Re: Cannot change brightness - Acer Aspire One A150

Hi Stankar,
I am not sure if this applicable to your situation but I also had a great deal of trouble adjusting the screen brightness.  I eventually found the following file /sys/devices/virtual/backlight/[**]/brightness

** = varies, mine was acpi_video0

the following worked for me:

echo -n [value 0-8] > /sys/devices/virtual/backlight/acpi_video0/brightness

I then made simple scripts to use xbindkeys and link my screen up/down to these scripts.

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#5 2011-02-12 20:40:35

Gusar
Member
Registered: 2009-08-25
Posts: 3,605

Re: Cannot change brightness - Acer Aspire One A150

"Only" 10 levels? How many do you expect? 10 is quite standard. It's how many I have on a A110. And here too /sys/class/backlight is empty.

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#6 2011-02-15 19:22:40

STANKAR
Member
From: Czech Republic
Registered: 2010-11-16
Posts: 47

Re: Cannot change brightness - Acer Aspire One A150

Novartum: in /sys/devices/virtual i don't have backlight directory and i can't make it (permission denied - i'm root only)

Gusar: 10 levels are little, but i expected i can change number of levels manually. I read some forums and it seems backlight cannot change from some bios version, where was backlight table. I know how i can change the "backlight" with xrandr, but i can change only software backlight, lcd have other backlight which i still cannot change sad

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