DPM support is broken in radeon APUs with HD 8000 radeon chips

[NothingMuchHereToSay]

Using Ubuntu 14.04 amd64 with Kernel's 3.13 and 3.14, DPM (Dynamic Power Management) support is broken on my Radeon 8670D APU chip. What happens is that when my PC boots, it shows the login screen for a second then immediately reboots on its own, I do however have encryption enabled on Ubuntu.

Manually disabling DPM support by adding "radeon.dpm=0" in "/etc/default/grub" in the section "GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" fixes this problem, but I would like to have better power management enabled for better performance of my chip.

Specs: MSI FM2-A75IA-E53 motherboard, 16GB DDR3 RAM, AMD A10-6700T APU.

The version of the driver 'radeon' is: 1:7.3.0-1ubuntu3.1

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xserver-xorg-video-radeon 1:7.3.0-1ubuntu3.1
Uname: Linux 3.14.2-031402-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Sat May 31 01:02:52 2014
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 fglrx, 14.10.1006, 3.13.0-24-generic, x86_64: built
 fglrx, 14.10.1006, 3.13.0-27-generic, x86_64: built
 virtualbox, 4.3.10, 3.13.0-24-generic, x86_64: installed
 virtualbox, 4.3.10, 3.13.0-27-generic, x86_64: installed
ExtraDebuggingInterest: No
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Richland [1002:999c] (prog-if 00 [VGA controller])
   Subsystem: Micro-Star International Co., Ltd. [MSI] Device [1462:7792]
InstallationDate: Installed on 2014-05-07 (23 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: MSI MS-7792
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.14.2-031402-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash radeon.dpm=0 vt.handoff=7
SourcePackage: xserver-xorg-video-ati
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/10/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: V2.2
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: FM2-A75IA-E53 (MS-7792)
dmi.board.vendor: MSI
dmi.board.version: 1.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: MSI
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV2.2:bd07/10/2013:svnMSI:pnMS-7792:pvr1.0:rvnMSI:rnFM2-A75IA-E53(MS-7792):rvr1.0:cvnMSI:ct3:cvr1.0:
dmi.product.name: MS-7792
dmi.product.version: 1.0
dmi.sys.vendor: MSI
version.compiz: compiz 1:0.9.11+14.04.20140423-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Fri May 30 01:13:38 2014
xserver.configfile: default
xserver.devices:
 input Power Button KEYBOARD, id 6
 input Power Button KEYBOARD, id 7
 input Logitech Unifying Device. Wireless PID:1025 MOUSE, id 8
 input Logitech USB Keyboard KEYBOARD, id 9
 input Logitech USB Keyboard KEYBOARD, id 10
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.15.1-0ubuntu2
xserver.video_driver: radeon

[NothingMuchHereToSay (nothingmuchhere-deactivatedaccount)]

There's a fix released for this bug, how do I close it and what do I mark it as? Invalid or fix committed?

https://bugs.freedesktop.org/show_bug.cgi?id=72921

[madbiologist (me-again)]

As you said, this is fixed by the BAPM (Balanced Average Power Management) support which has been added to the upstream 3.16 kernel.

For other people following this bug, a PPA of the 3.16-rc4 kernel can be found at http://kernel.ubuntu.com/~kernel-ppa/mainline/ and instructions on how to install and uninstall it are available at https://wiki.ubuntu.com/Kernel/MainlineBuilds

For now, I think that Fix Committed is appropriate, and Fix Released once Ubuntu 14.10 "Utopic Unicorn" is released in October.