On Wed, 30 Oct 2002, Fred Heitkamp wrote:

> I have a snakebite dual G4 Powermac.
> I have Debian installed with XFree from CVS that is
> just a week or so old.  The problem I have has occurred
> with all versions of X that I have tried.
> My Mac has the GForce 2MX video card.
> X seems to run OK but if I "log out" of X and try
> to restart my display goes black.
> I have to log in from another computer and reboot.
> A wild guess is that the video card  is left
> in a weird state.  Anyone else had a similar
> problem?

I have come across a similar problem on an x86 machine with a G550
DVI card, running Debian. I have a similar machine running RedHat
which does not exhibit the problem.
IIRC, on RedHat xdm dies if the X server misbehaves, and init restarts 
xdm. On Debian, xdm retries the X server, and if X mis-behaves
often enough* xdm ignores that X session.
For me, I'm not sure whether the X server completed with the wrong
return code, or DDC on DVI meant that the xdm gave up waiting for
the server to restart.

*tune with DisplayManager*startAttempts or 
DisplayManager*openRepeat in /etc/X11/xdm/xdm-config
I never got to the bottom of this.

-- 
Dr. Andrew C. Aitchison         Computer Officer, DPMMS, Cambridge
[EMAIL PROTECTED]   http://www.dpmms.cam.ac.uk/~werdna

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