On some AMD graphic card, I can reproduce the issue even with the xserver-xorg-lts-precise and quantal backported kernel (3.5.x).
The 100% Xorg CPU consumption can also be reproduced by logging out from the desktop system (back to lightdm) besides suspending the system. Both scenarios happens with high possibility (though not always, but usually in dozens of times). BTW, the virtual terminal switching leads to blank screen. When the Xorg occupied 100% CPU, ctrl+c in gdb, the backtrace: (gdb) bt #0 0x00007fb22e17b633 in __pread_nocancel () from /lib/x86_64-linux-gnu/libpthread.so.0 #1 0x00007fb22e38dc1b in ?? () from /usr/lib/x86_64-linux-gnu/libpciaccess.so.0 #2 0x00007fb22b89a29f in amd_xs113_int10_x_inl () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/modules/drivers/fglrx_drv.so #3 0x00007fb22b892dfb in ?? () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/modules/drivers/fglrx_drv.so #4 0x00007fb22b886515 in X86EMU_exec () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/modules/drivers/fglrx_drv.so #5 0x00007fb22b89b246 in amd_xs113_int10_xf86ExecX86int10 () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/modules/drivers/fglrx_drv.so #6 0x00007fb22b3e52fd in xf86ExecX86int10 () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/modules/drivers/fglrx_drv.so #7 0x00007fb229bdd3ed in VBESetVBEMode () from /usr/lib/xorg/modules/libvbe.so #8 0x00007fb22b416ce3 in ?? () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/modules/drivers/fglrx_drv.so #9 0x00007fb22b416b34 in atiddxVBESetConsoleMode () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/modules/drivers/fglrx_drv.so #10 0x00007fb22b53508b in xdl_xs113_atiddxLeaveVT () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/modules/drivers/fglrx_drv.so #11 0x00007fb22eef6282 in ?? () #12 0x00007fb22bf5f30e in ?? () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/modules/extensions/libglx.so #13 0x00007fb22eedbc27 in xf86Wakeup () #14 0x00007fb22ee9fb1b in WakeupHandler () #15 0x00007fb22eff8a06 in WaitForSomething () #16 0x00007fb22ee9b4f2 in ?? () #17 0x00007fb22ee8a15a in ?? () #18 0x00007fb22cdf276d in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6 #19 0x00007fb22ee8a4b1 in _start () -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1105171 Title: X.Org is stuck in a loop on resume from S3 To manage notifications about this bug go to: https://bugs.launchpad.net/amd/+bug/1105171/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
