You have been subscribed to a public bug: On my system, Xorg takes up 100% of (one of the) CPUs after startup. The problem goes away once the X server is restarted. This happens both with the xserver from the archive and the latest 1.7 snapshot. This might be a race related to the fact that ubuntu is installed on an SSD. It seems to be the same problem that is discussed in this ubuntuforums thread:
http://swiss.ubuntuforums.org/showthread.php?t=1272691 Here is what I could find out about the problem: strace reports repeated (failing) calls to ioctl(5, TCFLSH, 0x2) = -1 EIO (Input/output error) where fd 5 is /dev/tty7. This translates to a tcflush call in drain_console(). Backtrace: Breakpoint 6, drain_console (fd=5, closure=0x0) at ../../../../../hw/xfree86/os-support/linux/lnx_init.c:89 89 ../../../../../hw/xfree86/os-support/linux/lnx_init.c: No such file or directory. in ../../../../../hw/xfree86/os-support/linux/lnx_init.c (gdb) bt #0 drain_console (fd=5, closure=0x0) at ../../../../../hw/xfree86/os-support/linux/lnx_init.c:89 #1 0x000000000046ecd1 in xf86Wakeup (blockData=<value optimized out>, err=<value optimized out>, pReadmask=<value optimized out>) at ../../../../hw/xfree86/common/xf86Events.c:285 #2 0x0000000000443c7b in WakeupHandler (result=7, pReadmask=0x7d8440) at ../../dix/dixutils.c:413 #3 0x00000000004609d5 in WaitForSomething (pClientsReady=<value optimized out>) at ../../os/WaitFor.c:232 #4 0x0000000000440ef2 in Dispatch () at ../../dix/dispatch.c:381 #5 0x00000000004265fc in main (argc=9, argv=0x7d7228, envp=<value optimized out>) at ../../dix/main.c:285 o So we have a fd in some kind of error state that causes select() to always return right away. I don't know enugh about how select() works to identify the problem, though. ** Affects: gdm (Ubuntu) Importance: High Assignee: Bryce Harrington (bryceharrington) Status: Incomplete ** Affects: upstart (Ubuntu) Importance: High Status: Invalid ** Affects: gdm (Ubuntu Karmic) Importance: High Assignee: Bryce Harrington (bryceharrington) Status: Incomplete ** Affects: upstart (Ubuntu Karmic) Importance: High Status: Invalid ** Tags: ubuntu-boot -- [karmic] Xorg 100% CPU utilization -- only after first login https://bugs.edge.launchpad.net/bugs/439138 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gdm in ubuntu. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
