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When I resume from suspend-to-ram often the graphics on my internal screen is dim (around 30-50% intensity). Initially I thought it might be the backlight, but the mouse cursor is not dimmed - only everything else.

I also tried:

xbacklight -set 100
xbacklight -set 50

There is no change in the intensity of neither in the graphics nor the cursor.

A switch to another virtual terminal (CTRL-ALT-F2) and back (CTRL-ALT-F7) also did not change anything.

I attached an external screen and took a screen shot spanning both screens. The screen shot shows everything at full intensity.

xpdyinfo sees the two spanning screens as a single screen - thus does not treat the internal screen different.

Logging out and logging in again solves the issue, so it is clearly a software issue. The re-login seems to restart Xorg, but I would like to not have to re-login just to get the graphics on my screen un-dimmed.

Hardware: HP EliteBook 8540w
Software Ubuntu 11.10.
Window manager: xfce

How can I un-dim the graphics?

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Do you have a tool that changes the gamma and/or other colour parameters for your internal screen? If it's an nVidia chip, there's nvidia-settings, but xgamma should work regardless. That may reset the CLUT on your card. –  Alexios May 18 '12 at 9:07
    
I tested xgamma: It only affects the external monitor when using -d :0. -d :1 does not work. Also if I try the darkest setting (-gamma 0.1) text written in white is not dimmed. Good guess, though. Xorg indicates it is a Radeon card. –  Ole Tange May 18 '12 at 15:27
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1 Answer

I had this same issue on a Radeon card. Fixed it when it happened by tweaking the gamma setting in Catalyst Control Center. Worth a shot if you're able to install AMD's proprietary drivers on your system.

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Can you confirm that your mouse cursor was not affected? –  Ole Tange Oct 24 '12 at 11:19
    
I sure can. Mouse cursor is not affected by my workaround; it remains at normal brightness. EDIT: Or do you mean if I was having the same problem (with the screen dim but not the mouse)? In this case, yes, I was having the same exact issue. –  YellowApple Oct 25 '12 at 0:26
    
Unfortunately I am not able to install the proprietary driver. But fortunately I have not seen the dimming for a long time. Maybe it is a fixed bug in Xorg. –  Ole Tange Oct 30 '12 at 14:13
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