This bug really seems to have similar symptoms.
Adding
Option "DRI" "off"
to the Device section resulted in a black screen. However the mouse pointer was
not corrupted here and changed when moving where the login text field should be
displyed. Logging in seemed to work but the screen stayed black. After
switching to a terminal and back, the desktop background was painted and
corrupted panels.
Adding
Option "NoAccel" "true"
resulted in a corrupted screen.
Changed NoAcces to
Option "AccelMethod" "XAA"
seemed to display GDM normally. In X however, the windows are not updated
normally (e.g. after dragging a window i will not be repainted). Only the
widgets in the window are repainted when I move the mouse over them.
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Black screen with artefacts after boot
https://bugs.launchpad.net/bugs/392531
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