External Display Blurry when Mirrored

I have a 20" viewsonic VX2035 that is hooked up to my gaming rig. If I use it with my MBP and choose the mirror displays setting, when the Viewsonic is at its proper resolution (1680x1050) everything looks blurry. When at its correct resolution and not mirrored it looks normal. And it looks normal but slightly distorted if mirrored and at the 1440x900.
Any ideas?

I've found exactly the same thing.
In "mirror mode", the external display (for me a 23" cinemadisplay HD) uses the macbookpro's internal screen's resolution (though it does uprez it), even though on screen preferences it may be set much higher (1920x1200 on mine). Hence the fuzziness.
In "dual display" mode, and in lid-closed mode (where the external display is the only one on), it works perfectly.
Not sure why this is. If anyone has a fix, please post.
(this on a January 08 macbook pro and cinemadisplay)

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Cool!
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Please resolve the thread so others can find your answer faster.
Thanks,
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PCIe Lane Width:          x16
VRAM (Total):          512 MB
Vendor:          ATI (0x1002)
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Revision ID:          0x0000
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