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[mik047 <1097178@xxxxxxxxxxxxxxxxxx>]

affects me too.. I have NVIDIA® Quadro® K2100M Graphics 2GB GDDR5 on my
config. While installing ubuntu, it complains of following..

nouveau E [DRM] failed to idle channel 0xcccc0000 [DRM]
xhci_hcd 0000:00:14.0: HC died: cleaning up
INFO: rcu_sched detected stails on CPUs/tasks: {  2} (detected by 0, t=150002 jiffies, g=324, c=323, q=0)
BUG: soft lockup - CPU#0 stuck for 22s! [khubd:74]
BUG: soft lockup - CPU#0 stuck for 22s! [scsi_id:1042]
...series of the last two lines....
INFO: task kworker/2:1:83 blocked for more than 120 seconds.
Tainted: G W 3.16.0.30-generic #40~04.1-Ubuntu
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message
...again the above message continues randomly starting from INFO: rcu_sched .......

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https://bugs.launchpad.net/bugs/1097178

Title:
  nouveau failed to idle channel 0xcccc0000

Status in linux-lts-raring package in Ubuntu:
  Invalid

Bug description:
  Hi,

  With Kernel 3.7.* and 3.8rc1 and rc2 I have this error
  Jan  8 09:05:21 pcpoil kernel: [407794.764008] nouveau E[    1442] failed to idle channel 0xcccc0000
  Jan  8 09:05:23 pcpoil kernel: [407796.764446] nouveau W[PCIEGART][0000:01:00.0] flush timeout, 0x00000002
  Jan  8 09:05:25 pcpoil kernel: [407798.764540] nouveau W[PCIEGART][0000:01:00.0] flush timeout, 0x00000002
  Jan  8 09:05:27 pcpoil kernel: [407800.764586] nouveau W[PCIEGART][0000:01:00.0] flush timeout, 0x00000002
  Jan  8 09:05:27 pcpoil kernel: [407800.768002] [sched_delayed] sched: RT throttling activated

  The system become instable, and I need to reboot.

  It was working fine with kernel 3.5

  Kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline on Ubuntu 12.10
  VGA : 01:00.0 VGA compatible controller: NVIDIA Corporation NV43 [GeForce 6600 GT] (rev a2)

  dpkg -l |grep nouveau
  libdrm-nouveau1a:amd64 2.4.40+git20130104.baf0a7da-0ubuntu0ricotz~quantal  amd64
  libdrm-nouveau2:amd64 2.4.40+git20130104.baf0a7da-0ubuntu0ricotz~quantal  amd64
  xserver-xorg-video-nouveau 1:1.0.6+git20130107.8f934fad-0ubuntu0sarvatt~quantal  amd64

  uname -a
  Linux pcpoil 3.7.0-7-generic #15-Ubuntu SMP Sat Dec 15 16:34:25 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux


  Best regards,

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