Confirming this option is enabled for Trusty and Utopic, creating tasks
there. Currently, the discussion is still ongoing, but the primary bug
seems to be that DMA requests for order 0 pages are being passed into
CMA which makes no sense and triggers the issue. We are expecting a
patch for that to be pushed upstream shortly.
** Also affects: linux (Ubuntu Trusty)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Utopic)
Importance: Medium
Status: Triaged
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https://bugs.launchpad.net/bugs/1362261
Title:
CONFIG_DMA_CMA causes ttm performance problems/hangs
Status in “linux” package in Ubuntu:
Triaged
Status in “linux” source package in Trusty:
New
Status in “linux” source package in Utopic:
Triaged
Bug description:
The x86_64 kernels have CONFIG_DMA_CMA enabled, this causes extrem
hangs of at least the RADEON driver
full discussion is here: http://lists.freedesktop.org/archives/dri-
devel/2014-August/065842.html
ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: linux-image-3.16.0-10-generic 3.16.0-10.15
ProcVersionSignature: Ubuntu 3.16.0-10.15-generic 3.16.1
Uname: Linux 3.16.0-10-generic x86_64
ApportVersion: 2.14.6-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: aschultz 2224 F.... pulseaudio
/dev/snd/controlC1: aschultz 2224 F.... pulseaudio
CurrentDesktop: XFCE
Date: Wed Aug 27 18:57:02 2014
HibernationDevice: RESUME=UUID=702fb398-84d9-4e93-9b4b-980323bf2d53
MachineType: Hewlett-Packard HP EliteBook 8560w
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.16.0-10-generic
root=UUID=9a10044a-a505-4049-b794-a0ab87709daa ro rootflags=subvol=@ quiet
splash init=/lib/systemd/systemd vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.16.0-10-generic N/A
linux-backports-modules-3.16.0-10-generic N/A
linux-firmware 1.132
SourcePackage: linux
UpgradeStatus: Upgraded to utopic on 2014-07-21 (37 days ago)
dmi.bios.date: 07/15/2013
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68SVD Ver. F.42
dmi.board.name: 1631
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 01.3D
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias:
dmi:bvnHewlett-Packard:bvr68SVDVer.F.42:bd07/15/2013:svnHewlett-Packard:pnHPEliteBook8560w:pvrA0001D02:rvnHewlett-Packard:rn1631:rvrKBCVersion01.3D:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook 8560w
dmi.product.version: A0001D02
dmi.sys.vendor: Hewlett-Packard
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