Public bug reported:
I'm running Ubuntu 13.10 (Saucy) on a MacbookPro9,1, which has both an
Nvidia GeForce GT 650M and an integrated Intel HD Graphics 4000
controller. I boot with EFI and use the Nouveau driver.
On this machine logging out is slow, taking maybe 10 seconds or so.
'top' shows that the X server process uses lots of CPU during logout. I
ran sysprof and it attributes much of the CPU time to
nouveau_connector_detect, called via the following:
system_call_fastpath [48.98%]
sys_ioctl [41.90%]
do_vfs_ioctl [41.87%]
drm_ioctl [41.47%]
drm_mode_getconnector [34.14%]
drm_helper_probe_single_connector_modes [34.14%]
nouveau_connector_detect [28.84%]
nouveau_connector_detect_lvds [3.83%]
intel_crt_detect [1.48%]
The percentages above are of the total CPU time used in the shutdown
sequence, so I think several seconds of time is being spent in the path
above. That doesn't seem right.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Affects: xserver-xorg-video-nouveau (Ubuntu)
Importance: Undecided
Status: New
** Also affects: xserver-xorg-video-nouveau (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1191426
Title:
logout is slow, profiling reveals lots of CPU time in
nouveau_connector_detect
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