There are about a dozen xscreensaver bugs that look to possibly be dupes of this. At least, they smell similar. All seem to involve GL crashes on amd64 with fglrx:
https://bugs.edge.launchpad.net/ubuntu/+source/xscreensaver/?field.searchtext=fglrx&orderby=title
Note that there are also a bunch of similar bugs against nvidia.
There are about a dozen xscreensaver bugs that look to possibly be dupes of this. At least, they smell similar. All seem to involve GL crashes on amd64 with fglrx:
https:/ /bugs.edge. launchpad. net/ubuntu/ +source/ xscreensaver/ ?field. searchtext= fglrx&orderby= title
Note that there are also a bunch of similar bugs against nvidia.