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I upgraded from 13.10 to 14.04 and now after a while the complete OS freezes. I can't even go into TTY1 - TTY6. I have to use REISUB to restart my machine.

Most of the time, it freezes when I use Firefox (Aurora) and play some music videos and surf through the internet. Flash is not installed. Although it also freezes sometimes, when I do not use Firefox at all.

Are there any logs, which are helpful and provide them for you, since the reason for the freeze could be anything at all?

This is my hardware (hope it helps in any way):

  • Intel® Core™ i7-3770
  • ASUS GTX660TI-DC2-OG-2GD5 (no special driver is installed, just the default one)
  • ASUS P8Z77-V LX
  • Corsair DIMM 8 GB DDR3-1600 Kit
  • Samsung 830series 2,5" 256 GB (Windows is installed here)
  • Seagate ST31000524AS 1 TB (3/4 are reserved for files; 1/4 is for Ubuntu (16GB swap included))

Edit 01: Last time it froze, I watched a video and the sound kept playing, so I guess something with my displays; LG IPS235P-BN or my graphic card is wrong?

Edit 02: Seems like there is a problem with my audio settings/setup. If I don't watch any videos/listen to any music, Ubuntu runs like a charm.

When the system froze, I executed these commands from my Android phone:

sudo killall Xorg
sudo killall firefox
sudo killall chrome

But neither of those worked.

The logs from /var/log/syslog can be found here.

The complete kern.log file(1.4GB!) is filled with these 3 lines:

May 10 20:32:46 m01 kernel: [11846.172008] nouveau E[  PGRAPH][0000:01:00.0] TRAP ch 4 [0x027f996000 compiz[2206]]
May 10 20:32:46 m01 kernel: [11846.172020] nouveau E[  PGRAPH][0000:01:00.0] GPC3/TPC0/MP trap: MULTIPLE_WARP_ERRORS
May 10 20:32:46 m01 kernel: [11846.172030] nouveau E[  PGRAPH][0000:01:00.0] GPC3/TPC1/MP trap: MULTIPLE_WARP_ERRORS
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closed as off-topic by Braiam, bain, Mahesh, psusi, Eric Carvalho Jul 5 '14 at 1:59

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Bug reports and problems specific to development version of Ubuntu should be reported on Launchpad so that developers can see, track and fix these issues." – Braiam, bain, Mahesh
If this question can be reworded to fit the rules in the help center, please edit the question.

Could you check if there's anything useful in /var/log/syslog? The log contains timestamps so note the time before reproducing to easily find the corresponding lines. – Louis Matthijssen May 6 '14 at 20:33
@LouisMatthijssen these are the logs. I deleted the file and waited till it freezes again, so they should be pretty accurate. – Niklas May 7 '14 at 17:24
can you ssh into the machine when it does this? – crasic May 10 '14 at 17:18
@crasic Do you mean to remote logon? – Niklas May 10 '14 at 17:29
@Niklas yes, it will help determine if the system is still working but Xorg is unresponsive to your keyboard and your attempts to switch runlevels or is actually in a hard crash. If you can log in, you would also probably be able to fix it temporarily if you can log in and sudo killall Xorg to force X to reset. – crasic May 10 '14 at 17:38
up vote 3 down vote accepted

You have hit a bug in Nouveau. You can try updating to a mainline kernel (How do I add the mainline kernel PPA?), or install the Nvidia proprietary drivers (Ubuntu 14.04 install NVIDIA driver). It would probably help to get the bug fixed if you report it to or the Nouveau mailing list.

Your system also has Intel integrated graphics, so another option would be to disable the Nvidia card.

share|improve this answer
I installed the appropriate drivers from NVIDIA and let you know, how they work. – Niklas May 13 '14 at 19:13
@Niklas Did the Nvidia drivers fix the problem? – bain May 14 '14 at 22:22
Seems like it did, but I wanna wait one or two days more and see if really everything is okay. – Niklas May 15 '14 at 7:13
just hit this bug, kind of annoying as I am only using the nouveau drivers due to a bug with the NVIDIA ones not allowing me to use 3 screens :( – Horse Jul 15 '14 at 11:57
@Horse Report it to the Nouveau project. The more people who report these bugs to the developers and help to diagnose, the quicker the bugs will be fixed. – bain Jul 15 '14 at 12:11

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