FWIW this seems to be related to the disk with the root filesystem. Here's why:
I did some more tests: 1. Run 'stress -d 2' on another disk, then test with 'time ls /usr/bin'. 2. Run 'stress -d 2' on another disk, then test with 'time ls -R /media/other-disk/'. 3. Run 'stress -d 2' on root disk, then test with 'time ls -R /media/other-disk/' The results were pretty clear: 1. Rendering problem: NO 2. Rendering problem: NO 3. Rendering problem: YES So which directory is listed by the 'ls' command is irrelevant. Hence the conclusion: heavy I/O on the root disk -> bug. The root filesystem is ext3. On the laptop it's ext4. I have also tried to disable swap, but the problem still occurs. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/790337 Title: Heavy disk I/O causes X rendering to hang -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
