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Old 11-28-2013, 05:23 PM   #1
Registered: Dec 2011
Location: Oxford, UK
Distribution: Slackware, Debian
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Setting limits on screen brightness maximum and minimum

Hi all,
When my laptop starts and I start an X session with Mate, the screen brightness "jumps" up, but the level on the indicator remains the same. This is concerning as it sometimes brings the brightness to levels that I am sure are not healthy for the screen.

So, is there a way to hard set limits, or a range of possible brightness values?

Alternatively, if anybody else has experienced this and knows of a cause and/or solution, it would be great of you could share.

If it is any help, I have a ThinkPad T420 with the Intel graphics.

Best Regards,
Jack H
Old 11-30-2013, 02:33 AM   #2
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Have a look at these links, they might be useful:
- LCD Brightness
- How to change the Xorg gamma/brightness?
Old 11-30-2013, 04:09 AM   #3
Registered: Feb 2006
Location: Outer Shpongolia
Distribution: Slackware
Posts: 727

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i dont know if this will be of much help, but here's what I do:

I am using XFCE and boot to console. I have ThinkPad S430 and I like to have my screen pretty dim, so I have set the xgamma and xbacklight by putting the following in my ~/.xinitrc:

xgamma -gamma 0.4
xbacklight -set 70

Seems to work just fine. I would prefer, however, if XFCE could remember the screen brighness settings when I set them in the panel applet... Note that the values above and setting the backlight in addition to xgamma was necessary only for the ThinkPad screen (in my), which is LED. I have older LCD where setting only xgamma to 0.6 was just fine.

Last edited by solarfields; 11-30-2013 at 04:12 AM.


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