I initially posed this as Question #188982, but now decided to report it as it seems to persist and no definitive answers as to the cause were found. I was apprehensive about reporting at first mainly because this doesn't seem to occur on my other (Precise-running) computers. It is however 100% reproducible on this one (i.e. the flood occurs on each creation of an Xorg log, though I don't know what triggers individual lines).
My Xorg log is flooded with lines about reusing xkmfile:
jani@saegusa:~$ grep "XKB: reuse xkmfile /var/lib/xkb/server-" /var/log/Xorg.0.log | tail
[ 391.894] (II) XKB: reuse xkmfile /var/lib/xkb/server-5CBD5B10CEC815928ACEFB86BAB14051BA0C83FF.xkm
[ 391.901] (II) XKB: reuse xkmfile /var/lib/xkb/server-5CBD5B10CEC815928ACEFB86BAB14051BA0C83FF.xkm
[ 391.906] (II) XKB: reuse xkmfile /var/lib/xkb/server-5CBD5B10CEC815928ACEFB86BAB14051BA0C83FF.xkm
[ 391.909] (II) XKB: reuse xkmfile /var/lib/xkb/server-5CBD5B10CEC815928ACEFB86BAB14051BA0C83FF.xkm
[ 391.914] (II) XKB: reuse xkmfile /var/lib/xkb/server-5CBD5B10CEC815928ACEFB86BAB14051BA0C83FF.xkm
[ 391.919] (II) XKB: reuse xkmfile /var/lib/xkb/server-5CBD5B10CEC815928ACEFB86BAB14051BA0C83FF.xkm
[ 391.922] (II) XKB: reuse xkmfile /var/lib/xkb/server-5CBD5B10CEC815928ACEFB86BAB14051BA0C83FF.xkm
[ 391.926] (II) XKB: reuse xkmfile /var/lib/xkb/server-5CBD5B10CEC815928ACEFB86BAB14051BA0C83FF.xkm
[ 391.929] (II) XKB: reuse xkmfile /var/lib/xkb/server-5CBD5B10CEC815928ACEFB86BAB14051BA0C83FF.xkm
[ 391.933] (II) XKB: reuse xkmfile /var/lib/xkb/server-5CBD5B10CEC815928ACEFB86BAB14051BA0C83FF.xkm
jani@saegusa:~$ grep "XKB: reuse xkmfile /var/lib/xkb/server-" /var/log/Xorg.0.log | wc -l
1507
(Interestingly I now notice that the number of those lines seems to be constant: the above was copy+paste from terminal just now, and when I posed Question #188982 on 2012-02-27, the result was 1507 also.)
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: x11-xkb-utils 7.6+4
Uname: Linux 3.3.0-030300rc4-generic x86_64
.tmp.unity.support.test.0:
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
CheckboxSubmission: 09ae689090491ca53449589269e4bfd8
CheckboxSystem: edda5d4f616ca792bf437989cb597002
CompizPlugins: [core,bailer,detection,composite,opengl,decor,resize,compiztoolbox,place,gnomecompat,regex,grid,mousepoll,snap,move,wall,imgpng,vpswitch,session,unitymtgrabhandles,animation,fade,workarounds,expo,scale,ezoom,unityshell]
CompositorRunning: None
Date: Tue Mar 13 22:21:23 2012
DistUpgraded: Log time: 2011-11-20 23:52:49.660633
DistroCodename: precise
DistroVariant: ubuntu
DkmsStatus:
virtualbox, 4.1.8, 3.2.0-18-generic, x86_64: installed
virtualbox, 4.1.8, 3.3.0-030300rc4-generic, x86_64: installed
EcryptfsInUse: Yes
GraphicsCard:
Advanced Micro Devices [AMD] nee ATI RS780 [Radeon HD 3200] [1002:9610] (prog-if 00 [VGA controller])
Subsystem: ASUSTeK Computer Inc. Device [1043:82f1]
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
MachineType: System manufacturer System Product Name
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.3.0-030300rc4-generic root=UUID=bf0f4d7e-d08c-4aad-8143-b6e3b16049d6 ro quiet splash radeon.audio=1 vt.handoff=7
SourcePackage: x11-xkb-utils
UpgradeStatus: Upgraded to precise on 2012-03-13 (0 days ago)
dmi.bios.date: 08/12/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2101
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A78-EM
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2101:bd08/12/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A78-EM:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz 1:0.9.7.0+bzr3035-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.30-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.1-0ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.1-0ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.99.901+git20120126-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2
Yeah, it's just the xkb cache notification messages. For the most part innocuous, but 1507 lines is a bit much...