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I need to set some fancy resolution, like 700x500, 320x860, 400x400 etc. The problem is that the output of the device is not recognized, so it's set to default. But when I add a newmode to xrandr it warns that "Failed to get size of gamma for output default". And after I add the new mode to default output, xrandr fails to set the new resolution, responding "Configure crtc 0 failed". How can I fix this issue?

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Not every mode is possible. Here you can get nice example of some possible custom modelines. Still every modeline is not supported by every video card or monitor.

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xrandr rounds the resolution that user wants to add to some possible value. but that's not the point of my question – dmdkv Nov 21 '11 at 5:39
As I said not every imaginable mode is possible. This is already hardware limitation. For instance width is usually multiple of 8 or more. Similar rules exists for number of lines (based on how this data is organized in memory chips). – Cougar Nov 22 '11 at 9:41

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