misc/101340: Vidcontrol Causes Video Corruption In GDM

Jeff Molofee nehe at cruzinternet.com
Fri Aug 4 02:40:14 UTC 2006

>Number:         101340
>Category:       misc
>Synopsis:       Vidcontrol Causes Video Corruption In GDM
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Aug 04 02:40:12 GMT 2006
>Originator:     Jeff Molofee
>Release:        FreeBSD 6.1-STABLE #2
FreeBSD NeHe.divine 6.1-STABLE FreeBSD 6.1-STABLE #2: Fri Jul 28 21:20:20 MDT 2006     jeffm at NeHe.divine:/usr/obj/usr/src/sys/NeHe  i386
I've noticed an odd problem when I set allscreens_flags="MODE_282". If I
set this in rc.conf, when I reboot my machine, the minute GDM comes up,
I can see black on the top half of my screen, overwriting everything
else on the screen. As I move the mouse, the black lines overwrite more
of the screen. I can also see a very tiny cursor moving in the black.
What this looks like to me, is that part of the console screen memory is
overwriting the screen. Is there a fix for this or is this a known
problem? If I disable the allscreens_flags in rc.conf, boot normally,
switch to a console CTLR_ALT-F1from within Gnome then run vidcontrol
MODE_282 then switch back everything is fine... no corruption.

Video Card Nvidia 6800 AGP
Nvidia Drivers From Ports

Add allscreens_flags="MODE_282" or "MODE_283" to rc.conf, reboot machine, gdm will start, then screen will scramble.


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