black screen on startx exit

[Felix Miata]

I first noticed this last May on rv200 and filed a Redhat bug:
https://bugzilla.redhat.com/show_bug.cgi?id=1096487

Later it happened with Nouveau NV11 and I updated that bug.

Still later I noticed it happen on Cauldron on rv200:
https://ml.mageia.org/l/arc/dev/2014-09/msg00218.html

Last night it was happening in Tumbleweed on NV11.

So this doesn't look like any problem specific to the distros, but I don't
see any existing bug on bugs.freedesktop.org either. Could this be a problem
in something else, systemd or pam maybe? I've not seen this on Intel as old
as 845G? Would it actually be two bugs, one against Nouveau and another
against Radeon? Has no one else here encountered this?
-- 
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 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/