pkg/46919: xscreensaver freezes with GL visual

[diro%nixsyspaus.org@localhost]

>Number:         46919
>Category:       pkg
>Synopsis:       xscreensaver freezes with GL visual
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Sep 06 21:05:00 +0000 2012
>Originator:     diro%nixsyspaus.org@localhost
>Release:        NetBSD 6.0_RC1
>Organization:
>Environment:
System: NetBSD gift 6.0_RC1 NetBSD 6.0_RC1 (GIFT) #6: Sat Sep  1 04:44:23 UTC
2012  root@gift:/usr/obj/sys/arch/amd64/compile/GIFT amd64
Architecture: amd64
Machine: amd64
>Description:
This has been happening since NetBSD 6.0 BETA 1 (or possibly earlier; i can't
remember) and pkgsrc-2011Q4 i believe. I thought it was one of those freak bugs
that would just be fixed quickly, but with packages built from pkgsrc-2012Q2
(including modular-xorg-server), it is still present. Basically, any screensaver
that has the visual set to GL will freeze after running for a short time (less
than a minute). This doesn't seem to happen with any other visual.
>How-To-Repeat:
Set Visual to GL in xscreensaver-demo or by editing whatever program's line in
.xscreensaver. Run it for a few seconds and experience the freeze.
>Fix:
        I have no idea. There aren't any useful messages in Xorg.log nor in 
xdm.log.