screen resolution incorrect display

shogun1234 · 10-11-2012, 11:30 AM

My laptop is t420s. OS is debian testing (wheezy/sid).

Previously the installation works ok and can display 1600x900 resolution without a problem until I hit unknown buttons (can't remember what I pressed)

Now the screen become 1024x768 with screen display at the center.

If I use

Code:

xrandr -s 1600x900

then the screen become 1600x900, but the available space for application would only occupy 3/4 of the screen. And xrandr is as below

Code:

Screen 0: minimum 320 x 200, current 1600 x 900, maximum 8192 x 8192
LVDS1 connected 1600x900+0+0 (normal left inverted right x axis y axis) 310mm x 174mm
   1600x900       60.0*+
   1440x900       59.9  
   1360x768       59.8     60.0  
   1152x864       60.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
VGA1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768       60.0* 
   800x600        60.3     56.2  
   848x480        60.0  
   640x480        59.9

I don't see any EE in /var/log/Xorg.0.log
Where can I start to check or switch back to the correct setting?

Thanks

JaseP · 10-11-2012, 11:49 AM

Does the system have an xorg.conf file??? Look for it in /etc/X11/ and if present, please post the contents.

shogun1234 · 10-14-2012, 06:36 AM

Quote:

Originally Posted by JaseP

Does the system have an xorg.conf file??? Look for it in /etc/X11/ and if present, please post the contents.

There is no Xorg.conf existed in /etc/X11

Code:

app-defaults             notion     X      Xreset      Xsession          XvMCConfig
default-display-manager  rgb.txt    xinit  Xreset.d    Xsession.d        Xwrapper.config
fonts                    rxvt.menu  xkb    Xresources  Xsession.options

Previously there was no Xorg.conf and everything worked well.

The next day after shutting down, the problem goes away. Resolution comes back again.

JaseP · 10-16-2012, 04:00 PM

You probably just hit some hotkey that cause xrandr to switch displays (LVDS & VGA) and it put what assumed was an external display on your regular one...