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So I do a vanilla install of 10.04 Lucid Lynx, and login. The display resolution is clearly smaller than it should be.

I did a quick Google search, and then run xrandr:
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 4096 x 4096 VGA1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm 1360x768 59.8
1024x768 60.0* 800x600 60.3 56.2
848x480 60.0
640x480 59.9 59.9

Looks great- all I have to do is add a higher mode, 1360X1020. So I run cvt 1360 1020 and get this:
# 1360x1020 59.99 Hz (CVT 1.39M3) hsync: 63.47 kHz; pclk: 114.75 MHz Modeline "1360x1020_60.00" 114.75 1360 1448 1584 1808 1020 1023 1027 1058 -hsync +vsync

Alright. I copy the modeline, run xrandr --newmode with the modeline that I have, and there's no errors. However, here's the problem. When I try to use the new resolution, this is what happens:

$ xrandr --addmode VGA1 1360X1020_60.00
xrandr: cannot find mode "1360X1020_60.00"

I can't figure out why I'm getting this error, because I seem to have done all of the steps right. If it helps, the monitor is an Acer AL1714 running on a Dell Optiplex GX520. Thanks for any assistance in advance. `

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You seem to have typed a small "x" in the modeline (1360x1020), but a capital "X" in xrandr --addmode. Is this just a copy/paste error? –  Riccardo Murri Nov 14 '10 at 20:31
    
Solved! Thank you very much, I've been trying to fix this for days! Post it as an answer so I can give you credit. –  Archio Nov 14 '10 at 20:47
    
Exactly same issue! your question helped me solve it! –  Mohammad Yaseen Jun 1 '13 at 7:23
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2 Answers

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I'm not Riccardo but here is his answer(I'm doing this so this question will leave the "Unanswered 0 Answers" section)

You seem to have typed a small "x" in the modeline (1360x1020), but a capital "X" in xrandr --addmode. – Riccardo Murri

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xrandr --addmode VGA1 1360x1020

would have done just as well. xrandr (without arguments) will list the existing modes and the ones that can be added

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