https://bugzilla.novell.com/show_bug.cgi?id=343858#c26
--- Comment #26 from Federico Mena Quintero 2007-11-28 12:05:43 MST ---
The bug happens for the same reason as bug #310208 (the gnome-panel bug):
1. gdmwm.c obtains the list of Xinerama monitors. There are overlapping
monitors because we "clone" the display. However, the buggy Intel driver says
that monitor 0 is a connected VGA output, while there is in fact nothing
connected.
2. Places which call gdm_wm_screen_init() use GDM_KEY_XINERAMA_SCREEN to
indicate the "primary" monitor they want to use. The default is zero, so GDM
ends up picking the monitor size of the incorrectly-detected VGA output
(1024x768 in this case).
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