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[Radoslaw <1326567@xxxxxxxxxxxxxxxxxx>]

Thanks Christopher but I think my problem is pretty the same as in this
bug report. Looking at the source code provided with Ubuntu 14.04
distribution it seems the reason is just some debug logging switched on
in the kernel file:

linux-source-3.13.0/drivers/gpu/drm/radeon/radeon_display.c

There is radeon_crtc_page_flip function that contains:

	DRM_DEBUG_DRIVER("flip-ioctl() cur_fbo = %p, cur_bbo = %p\n",
			 work->old_rbo, rbo);

The command is called unconditionally. Solution seems to be simply
removing or commenting out above line.

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https://bugs.launchpad.net/bugs/1326567

Title:
  [Asus M4A88T-M] problem with drm:drm_mode_addfb and
  drm:radeon_crtc_page_flip

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  My kern log is full of literally millions of entries like this:

  Jun  1 07:51:05 atkinson-phenomIIx4 kernel: [119346.952590] [drm:drm_mode_addfb], [FB:58]
  Jun  1 07:51:05 atkinson-phenomIIx4 kernel: [119346.952610] [drm:radeon_crtc_page_flip], flip-ioctl() cur_fbo = ffff8803de155400, cur_bbo = ffff880407586000
  Jun  1 07:51:05 atkinson-phenomIIx4 kernel: [119346.952632] [drm:radeon_crtc_page_flip], flip-ioctl() cur_fbo = ffff8803de155400, cur_bbo = ffff880407586000

  
  I have found places where other have the problem.  But none seem to fix the problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-27-generic 3.13.0-27.50
  ProcVersionSignature: Ubuntu 3.13.0-27.50-generic 3.13.11
  Uname: Linux 3.13.0-27-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  oatkinson   3117 F.... pulseaudio
   /dev/snd/controlC1:  oatkinson   3117 F.... pulseaudio
   /dev/snd/controlC0:  oatkinson   3117 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Jun  4 16:21:04 2014
  HibernationDevice: RESUME=UUID=17c46ec6-2541-4e10-9ec2-258d229f3bd8
  InstallationDate: Installed on 2011-08-19 (1020 days ago)
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-27-generic root=UUID=3a8918dc-2e21-42ab-8e62-106b9b8f895e ro vesafb.invalid=1 drm.debug=0xe nopat plymouth:debug
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-27-generic N/A
   linux-backports-modules-3.13.0-27-generic  N/A
   linux-firmware                             1.127.2
  RfKill:
   
  SourcePackage: linux
  StagingDrivers: zram
  UpgradeStatus: Upgraded to trusty on 2014-04-18 (47 days ago)
  dmi.bios.date: 12/23/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2403
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: M4A88T-M
  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.:bvr2403:bd12/23/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A88T-M:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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