Can you please run "dmesg > dmesg.txt" and attach dmesg.txt after trying the first line (gallium driver) again?
The second line (classic driver) can be debugged with gdb like this:
LIBGL_DRIVERS_DIR=/usr/lib/dri-classic gdb /usr/lib/xscreensaver/pipes
and then follow the backtrace instructions as you did earlier.
Can you please run "dmesg > dmesg.txt" and attach dmesg.txt after trying the first line (gallium driver) again?
The second line (classic driver) can be debugged with gdb like this: DRIVERS_ DIR=/usr/ lib/dri- classic gdb /usr/lib/ xscreensaver/ pipes
LIBGL_
and then follow the backtrace instructions as you did earlier.