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i have kinda problem with setting my resolution on ubuntu 10.04

the thing is that i installed the machine and put it away without mouse, keyboard and monitor (i am currently remote with VNC viewer)

now the problem is that without a monitor plugged in i can`t increase the screen resolution above 800x600

how can i increase it let`s say to 1024x768

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btw i found that xrandr offers just these: " Screen 0: minimum 320 x 240, current 800 x 600, maximum 800 x 600 default connected 800x600+0+0 0mm x 0mm 800x600 60.0* 56.0 640x480 60.0 400x300 60.0 56.0 320x240 60.0 " – Slobodan Jan 26 '13 at 14:42
Can you select a resolution in your VNC client? – André Stannek Jan 26 '13 at 14:54
nope, tryed that was my first thought :) – Slobodan Jan 26 '13 at 15:02
possible duplicate of Ubuntu 14.04 - Add Fake Display when No Monitor is Plugged In – Sneetsher May 8 '14 at 18:27

I found a page that might be just the thing for you.....

Relevant section:

Adding undetected resolutions Due to buggy hardware or drivers, your monitor's correct resolutions may not always be detected. For example, the EDID data block queried from your monitor may be incorrect.

If the mode already exists, but just isn't associated for the particular output, you can add it like this:

xrandr --addmode S-video 800x600

If the mode doesn't yet exist, you'll need to create it first by specifying a modeline:

xrandr --newmode <Mode``Line>

You may create a modeline using the gtf or cvt utility. For example, if you want to add a mode with resolution 800x600 at 60 Hz, you can enter the following command: (The output is shown following.)

cvt 800 600 60
# 800x600 59.86 Hz (CVT 0.48M3) hsync: 37.35 kHz; pclk: 38.25 MHz
Modeline "800x600_60.00"   38.25  800 832 912 1024  600 603 607 624 -hsync +vsync

Then copy the information after the word "Modeline" into the xrandr command:

xrandr --newmode "800x600_60.00"   38.25  800 832 912 1024  600 603 607 624 -hsync +vsync

After the mode is entered, it needs to be added to the output using the --addmode command as explained above.

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