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My two monitors run on different resolutions (laptop 1440x900, HDMI 1920x1080). I set them up as an extended desktop and they work just fine

However, while logging in, the greeter appears to be set to "mirror displays" and seems to be running at a lower resolution on both screens. This does not only look bad but makes my HDMI monitor turn itself of and on again (it does that with unsupported resolutions)

The problem appeared after I did a fresh install of oneiric, it worked just fine on Natty. The laptop is a Dell Inspiron 1525 that came with Ubuntu and it has an Intel graphics chip:

00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) (rev 0c)
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up vote 1 down vote accepted

Does this answer help you? Need to reconfigure absolute position of dual monitors after reboot, how do I fix that? . This is how I worked around the exact same issue you are having. Sorry but I can't post comments yet in the site :(

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That's exactly what I'm looking for, thank you. It works as expected – Florian Heinle Nov 19 '11 at 19:11

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