[Bug 2627] New: Neomagic 256AV (NM2200) rendering artifacts on TP 600E

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https://bugs.freedesktop.org/show_bug.cgi?id=2627          
     
           Summary: Neomagic 256AV (NM2200) rendering artifacts on TP 600E
           Product: xorg
           Version: 6.8.2
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Keywords: regression
          Severity: normal
          Priority: P2
         Component: Driver/Neomagic
        AssignedTo: xorg-bugzilla-noise at freedesktop.org
        ReportedBy: jfrieben at hotmail.com


After upgrading from release 6.8.1 to release 6.8.2 for an IBM Thinkpad 600E
notebook running FC3, artifacts appear in the upper part of the desktop which
result from erroneous mirroring of objects in the lower part of the screen. The
operating mode is 1280x1024 pixel ("externdisp") at 16 bpp which requires the
total 2560 KB of video memory available on this notebook. The artifacts
(screenshot attached) disappear when clicking the background.
The phenomenon only becomes visible for resolutions higher than the standard
1024 x 768 pixels of the internal LCD. The ghost images can be by prevented by
adding the "ShadowFB" option to the "xorg.conf" device section.
It is also worth mentioning that this behaviour which had been absent from
release 6.7.0 showed up for some 6.8 prerelease, but had gone away as the final
6.8 release went public.          
     
     
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