If X crashes with glxinfo you might try to get a full backtrace like described here https://wiki.ubuntu.com/X/Backtracing. You need to use a second system to connect through ssh or something like that to use gdb while X hangs.
If X crashes with glxinfo you might try to get a full backtrace like described here https:/ /wiki.ubuntu. com/X/Backtraci ng. You need to use a second system to connect through ssh or something like that to use gdb while X hangs.