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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