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[Launchpad Bug Tracker <1474538@xxxxxxxxxxxxxxxxxx>]

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nouveau fills /var/log/kern.log and /var/log/syslog with _very_ frequent messages when the molecule xscreensaver is running.
This is a big problem as it prevents me from letting my machine do anything overnight (with the screenlock on).

I haven't tested other screensavers and don't appear to get messages
otherwise. Here is an excerpt:

====================8< CUT HERE 8<=================================================================
$ tail -n 3000 kern.log.1 | head -n 50
Jul 10 18:02:35 dioo-XPS kernel: [114893.357149] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.406261] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.406269] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.420442] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.420447] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.479210] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.479217] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.568349] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.568356] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.622806] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.622813] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.637217] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.637221] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.695836] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.695843] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.784309] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.784316] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.838180] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.838187] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.853754] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.853759] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.913521] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.913528] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.977242] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.977249] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114894.068780] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114894.068788] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114894.122599] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114894.122606] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114894.137025] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114894.137030] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114894.195675] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114894.195682] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:36 dioo-XPS kernel: [114894.284069] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:36 dioo-XPS kernel: [114894.284078] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:36 dioo-XPS kernel: [114894.339830] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:36 dioo-XPS kernel: [114894.339837] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:36 dioo-XPS kernel: [114894.353411] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:36 dioo-XPS kernel: [114894.353416] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:36 dioo-XPS kernel: [114894.412188] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:36 dioo-XPS kernel: [114894.412204] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:36 dioo-XPS kernel: [114894.501906] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:36 dioo-XPS kernel: [114894.501913] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:36 dioo-XPS kernel: [114894.558826] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:36 dioo-XPS kernel: [114894.558831] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:36 dioo-XPS kernel: [114894.570001] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:36 dioo-XPS kernel: [114894.570006] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:36 dioo-XPS kernel: [114894.628831] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:36 dioo-XPS kernel: [114894.628839] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:36 dioo-XPS kernel: [114894.717193] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
====================8< CUT HERE 8<==================================================================

Both log files are actually 99GiB (they'd be bigger, but at that point
my / partition was full). Both files contain almost 975M lines each
(which is quite a lot for a file that gets rotated daily!)

I run a minimal system (log in to the console, start i3 with startx) and
I have a keybinding to launch a xscreensaver (specifically the molecule
screensaver from xscreensaver-gl-extra).

I had no problem under Ubuntu 15.04 32 bits, but for work-related
reasons, I had to downgrade to 14.04 (64 bits).

Both the default kernel (I don't remember which version it was) and
3.19.0-22 exhibit the problem.

$ lspci -nn | grep VGA
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation Device [10de:1286] (rev a1)

I am not sure if this is relevant, but I have three screens all
connected to the nVidia card.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.19.0-22-generic 3.19.0-22.22~14.04.1
ProcVersionSignature: Ubuntu 3.19.0-22.22~14.04.1-generic 3.19.8-ckt1
Uname: Linux 3.19.0-22-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
Date: Tue Jul 14 15:31:42 2015
InstallationDate: Installed on 2015-07-03 (10 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
SourcePackage: linux-lts-vivid
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty
-- 
nouveau driver fills syslog when running xscreensaver (molecule)
https://bugs.launchpad.net/bugs/1474538
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