Fix found. echo 1 > /sys/module/processor/parameters/max_cstate
fixes slow disk writes. This laptop only shows 1 CPU in /proc/cpuinfo. -- Slow disk writes (ubuntu kernel) https://launchpad.net/bugs/50741 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
