Needing help with display problems

Dariusz J. Garbowski thuforuk at yahoo.co.uk
Wed Apr 14 01:17:14 UTC 2010


On 13/04/10 12:24 PM, Anne Wilson wrote:
> My new laptop has an Intel WXGA video card - and I have no more detail than 
> that.  dpms identifies it as an "LCD panel 1280x1024", yet X insists that 
> 1024x768 is the best it can do.  That produces horrible distortions, so it's 
> important to get this sorted.
> 
> I tried commenting out the dpms option and adding a Modes line, but still I'm 
> stuck with the same display.  Running xrandr in konsole gives me
> 
> Screen 0: minimum 640 x 480, current 1024 x 768, maximum 1024 x 768
> default connected 1024x768+0+0 0mm x 0mm
> 	1024x768	61.0*
> 	800x600	61.0
> 	640x480	60.0
> 	1024x600	 0.0
> 
> Before I tried to fix things I think I was seeing 1024 x 600, as the 1024x768 
> does fill my screen, whereas the original display was taller than the screen.
> 
> Any ideas what might be causing the problem, and what I could do about it?

I have just had similar issue two days ago with dual setup of 1920x1200 displays on Radeon driver. 
For some silly reason login X chooses to default to 1280x720 (!). This is on Fedora 11. I have yet 
to file a bug.

Here's how I sorted it out:

Use cvt command to get modeline data, e.g.:

$ cvt 1920 1200 60
# 1920x1200 59.88 Hz (CVT 2.30MA) hsync: 74.56 kHz; pclk: 193.25 MHz
Modeline "1920x1200_60.00"  193.25  1920 2056 2256 2592  1200 1203 1209 1245 -hsync +vsync

Now edit your ~/.bash_profile and add:

xrandr --newmode 1920x1200 193.25  1920 2056 2256 2592  1200 1203 1209 1245 -hsync +vsync
xrandr --addmode DVI-0 1920x1200
xrandr --output DVI-0 --mode 1920x1200

Note: if the xrandr --new mode complains something about X resources, change the name of the mode to 
something like 1920x1200_1.

Note 2: In your case, s/1920x1200/1280x1024/g in above examples.

Hope this helps!

Cheers,
Dariusz






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