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To work around bug #1005495 (changing LCD brightness via hotkeys impossible), I'd like to have one command line query for increasing and one for reducing the brightness of my LCD. I could then map a hotkey to each one of this queries.

The problem is: I don't know how to increase and reduce the LCD brightness on the command line. Do you?

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possible duplicate of Unable to change brightness in a Lenovo laptop – Lekensteyn Jun 10 '12 at 17:30
Thanks, Lekensteyn, but it's not a duplicate since lsmod | grep ^i915 gives me no output (see accepted solution). Still looking for a solution. – user69748 Dec 14 '12 at 11:56

3 Answers

up vote 1 down vote

for Laptops
sudo setpci -s 00:02.0 F4.B=80
change 80 by [0-FF] to get lowest-highest brightness The value specified is in hex, so 80 will give you a 50% brightness

for Desktop [not tested by ME]
xgamma -gamma .75

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Thanks for you answer but what I'd need is something like setpci --increase 10 to increase the brightness by 10 percent. Is that possible, too? – user69748 Dec 14 '12 at 11:50
up vote 4 down vote

Open your terminal and type this 

xrandr -q | grep " connected"

it will gives you the output as LVDS1 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 331mm x 207mm

There LVDS1 Stands for your display .

so now you have to do as 

xrandr --output LVDS1 --brightness 0.5

there 0.5 stands for brightness and it ranges from 0.0 to 1.0 . 0.0 -> Full black .so you have to choose the required value of brightness .

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Thanks for you answer but what I'd need is something like xrandr --increase 10 to increase the brightness by 10 percent. Is that possible, too? – user69748 Dec 14 '12 at 11:50
@user69748 well, you could use my first answer for that purpose . – Jai Dec 14 '12 at 17:21
thanks but that doesn't work for me as written there. – user69748 Jan 17 at 16:01
up vote 7 down vote

one more way we have to do this is with another new program named as xbacklight , open your terminal and type this 

sudo apt-get install xbacklight

then type this xbacklight -set 50

there 50 stands for brightness range we can get it upto 100 from 0 .

you can also increase and decrease the brightness from present value to specified level.as you mentioned if you want to increase to 10% from current value of brightness then you can give this 

xbacklight -inc 10

and to decrease 10% you can give this

xbacklight -dec 10
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+1 for simplicity. – zpletan Jun 11 '12 at 5:31
Looks like a really simple command but what I'd need is something like xbacklight -increase 10 to increase the brightness by 10 percent. Is that possible, too? – user69748 Aug 24 '12 at 9:31
@user69748 answer edited – Jai Aug 24 '12 at 10:47
Yes you can. I've already mention that . so you can get that by xbacklight -inc 10 – Jai Aug 24 '12 at 16:53
Ok, now it's in your answer. Thanks a lot, I'll try that out. – user69748 Aug 27 '12 at 7:28
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