The work-around of disabling polling works for me. I have confirmed that on the M4600, the polling of its 5 ports take up to 484 milliseconds during which the system is "frozen". I haven't investigated why but I'm confident that they way nouveau is detecting the DDC and EDID information is causing these brief lockups.
Gents, I have instrumented the nouveau driver to get exact timing and the problem is definitely the EDID probe for the HDMI port taking 250 milliseconds and DDC detection taking 160 milliseconds for each port! HDMI port connected Nov 7 20:00:21 Precision-M4600-JRYQKQ1 kernel: [ 231.106058] Got to nouveau_connector_detect Nov 7 20:00:21 Precision-M4600-JRYQKQ1 kernel: [ 231.106059] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:238 - Nov 7 20:00:21 Precision-M4600-JRYQKQ1 kernel: [ 231.106061] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:247 - Detecting DDC Nov 7 20:00:21 Precision-M4600-JRYQKQ1 kernel: [ 231.138669] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:249 - DDC detected Nov 7 20:00:21 Precision-M4600-JRYQKQ1 kernel: [ 231.138670] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:251 - Getting EDID information Nov 7 20:00:21 Precision-M4600-JRYQKQ1 kernel: [ 231.352525] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:253 - EDID information obtained Nov 7 20:00:21 Precision-M4600-JRYQKQ1 kernel: [ 231.352529] [drm:output_poll_execute], [CONNECTOR:17:DP-3] status updated from 1 to 1 HDMI port disconnected Nov 7 20:04:07 Precision-M4600-JRYQKQ1 kernel: [ 457.286060] [drm:output_poll_execute], [CONNECTOR:17:DP-3] Probing... Nov 7 20:04:07 Precision-M4600-JRYQKQ1 kernel: [ 457.286061] Got to nouveau_connector_detect Nov 7 20:04:07 Precision-M4600-JRYQKQ1 kernel: [ 457.286062] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:238 - Nov 7 20:04:07 Precision-M4600-JRYQKQ1 kernel: [ 457.286064] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:247 - Detecting DDC Nov 7 20:04:07 Precision-M4600-JRYQKQ1 kernel: [ 457.446021] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:249 - DDC not detected! Nov 7 20:04:07 Precision-M4600-JRYQKQ1 kernel: [ 457.446024] [drm:output_poll_execute], [CONNECTOR:17:DP-3] status updated from 2 to 2 No ports connected. Notice the DDC detection takes 160 millisecs to time out for each DP port. total detection time 484 milliseconds Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 645.966016] [drm:output_poll_execute], [CONNECTOR:9:DP-1] Probing... Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 645.966027] Got to nouveau_connector_detect Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 645.966033] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:238 - Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 645.966039] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:247 - Detecting DDC Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.126051] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:249 - DDC not detected! <==== .16 Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.126053] [drm:output_poll_execute], [CONNECTOR:9:DP-1] status updated from 2 to 2 Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.126055] [drm:output_poll_execute], [CONNECTOR:12:DP-2] Probing... Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.126057] Got to nouveau_connector_detect Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.126058] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:238 - Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.126059] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:247 - Detecting DDC Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.286021] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:249 - DDC not detected! <==== .16 Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.286023] [drm:output_poll_execute], [CONNECTOR:12:DP-2] status updated from 2 to 2 Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.286026] [drm:output_poll_execute], [CONNECTOR:15:eDP-1] Probing... Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.286028] Got to nouveau_connector_detect Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.286029] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:238 - Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.286031] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:247 - Detecting DDC Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.286054] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:249 - DDC not detected! <==== .16 Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.286056] [drm:output_poll_execute], [CONNECTOR:15:eDP-1] status updated from 2 to 2 Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.286058] [drm:output_poll_execute], [CONNECTOR:17:DP-3] Probing... Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.286059] Got to nouveau_connector_detect Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.286060] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:238 - Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.286062] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:247 - Detecting DDC Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.446019] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:249 - DDC not detected! <=== .16 Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.446021] [drm:output_poll_execute], [CONNECTOR:17:DP-3] status updated from 2 to 2 Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.446023] [drm:output_poll_execute], [CONNECTOR:20:VGA-1] Probing... Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.446025] Got to nouveau_connector_detect Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.446026] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:238 - Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.446027] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:247 - Detecting DDC Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.449954] [drm] nouveau 0000:01:00.0: nouveau_connector_detect:249 - DDC not detected! Nov 7 20:07:16 Precision-M4600-JRYQKQ1 kernel: [ 646.449955] [drm:output_poll_execute], [CONNECTOR:20:VGA-1] status updated from 2 to 2 Roger R. Cruz -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-nouveau in Ubuntu. https://bugs.launchpad.net/bugs/926714 Title: continuous jerky mouse movements while using nouveau driver in 12.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/926714/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
