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Old 1st October 2010, 01:55 PM
keegan Offline
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Join Date: Apr 2009
Posts: 17
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Second monitor not showing proper resolution

HI all,

It seems that whenever I boot my laptop (hp probook 6450b) without a monitor attached, then boot with a monitor later attached, the configuration gets all messed up.

Currently, if I boot with the monitor attached, right after the blue loading screen (at the login prompt) i get two black monitors and a mouse, with no login screen. Unplugging the monitor shows the login screen on the laptop.

If i boot without the monitor attached, log in, then plug it in, i see the following from xrandr:

Code:
Screen 0: minimum 320 x 200, current 2390 x 768, maximum 8192 x 8192
LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 310mm x 174mm
   1366x768       59.6*+
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
VGA1 connected 1024x768+1366+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
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
HDMI3 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)
The problem is that before i booted once without it connected, I could get it to display at 1280x1024.

I had this problem once before, and took the following steps to resolve it:

Code:
[08:51 AM][keegan@localhost:~]#>cvt -v 1280 1024
# 1280x1024 59.89 Hz (CVT 1.31M4) hsync: 63.67 kHz; pclk: 109.00 MHz
Modeline "1280x1024_60.00"  109.00  1280 1368 1496 1712  1024 1027 1034 1063 -hsync +vsync
[08:51 AM][keegan@localhost:~]#>xrandr --newmode "1280x1024_60.00" 109.00 1280 1368 1496 1712 1024 1027 1034 1063 -hsync +vsync
Now doing xrandr shows the new modes at the bottom:
Code:
[08:52 AM][keegan@localhost:~]#>xrandr
Screen 0: minimum 320 x 200, current 2390 x 768, maximum 8192 x 8192
LVDS1 connected 1366x768+1024+0 (normal left inverted right x axis y axis) 310mm x 174mm
   1366x768       59.6*+
   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  
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
HDMI3 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)
  1280x1024_60.00 (0xc4)  109.0MHz
        h: width  1280 start 1368 end 1496 total 1712 skew    0 clock   63.7KHz
        v: height 1024 start 1027 end 1034 total 1063           clock   59.9Hz
And doing the following fixes it:
Code:
[09:01 AM][keegan@localhost:~]#>xrandr --addmode VGA1 1280x1024_60.00
[09:01 AM][keegan@localhost:~]#>xrandr --output VGA1 --mode 1280x1024_60.00 --auto --left-of LVDS1

However, now when I reboot, all settings are lost, and if the monitor is attached, i get the black screen with a mouse at login.


I did notice that when I shutdown, it hangs on "Running guests on default URI", and i get a stack trace. It will keep dumping stack traces, and i have to hold down the power button to force it off.



If anyone has any suggestions, I appreciate it. Again, all of this worked until i booted without the attached monitor. There is no options in the Monitors preferences dialog.

Last edited by keegan; 1st October 2010 at 02:18 PM.
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