From Bugzilla Helper: User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; Hotbar 2.0) Description of problem: Desktop blackens when drag and drop used on SIS 620 VGA adapter Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1.just drag any icon on KDE and the desktop blackens on SIS 620 VGA adapter but works fine with old KDE versions and GNOME on 6.1,6.2 2. This bug is experienced by all redhat 7.1 i686 users with SIS 620 VGA adapter 3. Additional info: This bug is exclusive to SIS 620 VGA adapter only and is not caused under older versions of KDE and GNOME and alos only caused under KDE2 and not under GNOME
Since it's specific to one graphics card, this ought to be an X bug, triggered by something the new KDE code does.
Try using the Option "Noaccel" in your XF86Config-4 file. To find out how to do this, read: man XF86Config If that solves the problem, it will be quite slow, but work. To get faster setup, remove the noaccel, and experiment one at a time with the various XAANo______ options listed in the above manual page.
*** This bug has been marked as a duplicate of 38152 ***