After letting my desktop locked for 10 days, I found it frozen, with root filesystem 100% full. Apparently, /var/log/kern.log and /var/log/syslog have received more than 60'000 times per second the following line :

Jan 3 07:35:56 hostname kernel: [1091871.858753] nouveau 0000:03:00.0: fifo: PBDMA0: 04000000 [ACQUIRE] ch 2 [007f9a3000 Xorg[2915]] subc 0 mthd 001c data 00001004

This is with:

  • Ubuntu 16.04 LTS
  • linux-image-generic: 4.4.0
  • xserver-xorg-video-nouveau: 1:1.0.12

What can we do with it?

  • I'd think stopping the excessive logging might be an idea, was that the only problem? – Xen2050 Jan 4 '18 at 12:01
  • Yes, that's the only thing I noticed. – samb Jan 4 '18 at 12:52

That version of the nouveau driver seems to be buggy with my graphic card when the Desktop is in power saving (or at least with the screensaver). https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1474538

That second option worked for me, so all I did was :

sudo apt-get install --install-recommends linux-generic-hwe-16.04 xserver-xorg-hwe-16.04

and reboot on the latest kernel & newer nouveau driver.

  • linux-image-generic: 4.10.0
  • xserver-xorg-video-nouveau-hwe-16.04 : 1.0.14

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