@Michael -- the fix you propose for the issue was applied to 14.04 in the upstream stable update v3.13.3, the commit below:
commit 318729d307dc565a1c44bb02a8710b5a4f0b4037 Author: Alex Deucher <[email protected]> Date: Sat Jan 11 10:55:55 2014 -0500 drm/radeon: disable dpm on BTC commit 919cf555c04e16dafb1fba56904eb23889a812c3 upstream. That commit (and v3.13.3 in general) are contained in the Ubuntu 3.13.0-10.30 upload, which would imply that fix was in the kernel in the -release pocket, in Ubuntu 3.13.0-24.46, and it cirtainly seems to be correctly applied there. That said it does appear some other fixes have been applied in this area which may well have reenabled it for some of these cards. It appears some further investigation is needed, to determine why the fixes for this have not worked and to feed this back to stable. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1297464 Title: 1002:6739 14.04 randomly reboots Status in “linux” package in Ubuntu: Triaged Status in “linux” source package in Trusty: New Bug description: I've noticed after installing Ubuntu 14.04 on my computer, that a DPM issue exists. DPM needs to be disabled by default like in kernel 3.14 so that the live CD or desktop session does not instantly reboot the machine. WORKAROUND: Edit grub.cfg on the bootable flash drive and adding radeon.dpm=0 to the boot options, along with cd'ing to /target/etc/default and editing grub with the same change before rebooting after installation to bypass it. --- ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ubuntu 2789 F.... pulseaudio /dev/snd/controlC1: ubuntu 2789 F.... pulseaudio CasperVersion: 1.340 CurrentDesktop: Unity DistroRelease: Ubuntu 14.04 IwConfig: eth0 no wireless extensions. lo no wireless extensions. LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) MachineType: System manufacturer System Product Name Package: linux (not installed) ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=(loop)/casper/vmlinuz.efi root=UUID=E3B4-EDF6 debian-installer/language=en keyboard-configuration/layoutcode=us iso-scan/filename=/username-14.04-desktop-amd64.iso boot=casper file=/cdrom/preseed/username.seed noprompt quiet splash radeon.dpm=0 -- ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9 RelatedPackageVersions: linux-restricted-modules-3.13.0-24-generic N/A linux-backports-modules-3.13.0-24-generic N/A linux-firmware 1.127 RfKill: Tags: trusty Uname: Linux 3.13.0-24-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 06/17/2010 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 2102 dmi.board.asset.tag: To Be Filled By O.E.M. dmi.board.name: M4A79XTD EVO 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.:bvr2102:bd06/17/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A79XTDEVO:rvrRevX.0X:cvnChassisManufacture:ct3:cvrChassisVersion: dmi.product.name: System Product Name dmi.product.version: System Version dmi.sys.vendor: System manufacturer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1297464/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
