An old thread, I know but I've experienced similar problems.

After upgrade from Ubuntu 14.04.3 to 16.04.1 with Xmonad window manager
certain undesirable symptoms began to arise.  Of course, fglrx was be
removed and the xserver-xorg-driver-ati(?) graphics driver was installed
instead. In 14.04 I was running the proprietary driver for the Intel
part of the hybrid card. After upgrading some icons appear very large
while others are normal. The laptop also runs about fifteen degC hotter.
This is the most troubling aspect as it is detrimental to the health of
the machine.

I reverted to Ubuntu 14.04.3 with linux-image-xxx-lts-wily as the latest
combination of Ubuntu and linux kernel compatible with fglrx.  All very
well until dirtyCOW arose, as this kernel is no longer supported.

Question:  Is this problem related to the others mentioned in this
thread?  Has there been a resolution since July 2016?

The following information may help:

Output of lspci  -mm | grep VGA is:

00:01.0 "VGA compatible controller" "Advanced Micro Devices, Inc.
[AMD/ATI]" "Richland [Radeon HD 8650G]" "Hewlett-Packard Company"
"Richland [Radeon HD 8650G]"

Output of sudo lshw -C video is

  *-display UNCLAIMED     
       description: VGA compatible controller
       product: Richland [Radeon HD 8650G]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 1
       bus info: pci@0000:00:01.0
       version: 00
       width: 32 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list
       configuration: latency=0
       resources: memory:d0000000-dfffffff ioport:5000(size=256) 
memory:f0400000-f043ffff
  *-display UNCLAIMED
       description: Display controller
       product: Sun XT [Radeon HD 8670A/8670M/8690M / R5 M330]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci@0000:01:00.0
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi cap_list
       configuration: latency=0
       resources: memory:e0000000-efffffff memory:f0300000-f033ffff 
ioport:4000(size=256) memory:f0340000-f035ffff

Output of lspci -nnk | grep -i vga -A3 is

00:01.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. 
[AMD/ATI] Richland [Radeon HD 8650G] [1002:990b]
    DeviceName: RICHLAND (990B)
    Subsystem: Hewlett-Packard Company Richland [Radeon HD 8650G] [103c:1985]
    Kernel modules: radeon


Am I right in understanding that though the radeon kernel module is loaded it 
is not being used? If so, what must I do to use it?

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-ati in Ubuntu.
https://bugs.launchpad.net/bugs/1080350

Title:
  1002:9552 [Compaq Presario CQ61-320EG Notebook PC] CPU Overheating
  with ATI driver Radeon HD Mobility graphics

Status in xserver-xorg-driver-ati:
  Invalid
Status in xserver-xorg-video-ati package in Ubuntu:
  Triaged

Bug description:
  Ever since upgrading from Maverick (with GNOME Classic) to Precise
  (using Unity 2D since using the default Unity makes the situation
  worse) my note book regularly overheats with normal usage:

  I've been regularly using:
  echo low | sudo tee /sys/class/drm/card0/device/power_profile

  I've am also using psensor to warn me if the temperature rises above
  92°.  When 'idle' the temperature is at about 80°.  If the CPU is used
  (merely starting eclipse and letting all the the startup validation
  processes finish) it quickly rises to 88°.  If the usages is sustained
  (rebuilding a java project) the temperature oscillates between 95° and
  98°.  If I do anything else that adds to the load (ie. if the
  temperature is >98° for short period of time), the system freezes, but
  the everything remains on, fans and CPU temperature stays up.  I need
  to turn off the notebook by keeping the power button pressed.

  Note that this system overheats /with/ the low power profile.

  Here are some general stats about this system, please let me know, if
  I can provide further information:

  This started after the upgrading from Maverick.  I'm currently running
  Precise with the 2D Unity desktop.

  WORKAROUND: sudo apt-get -y install gnome-applets && sudo cpufreq-
  selector --cpu=0 --governor=powersave && sudo cpufreq-selector --cpu=1
  --governor=powersave

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: xserver-xorg-video-radeon 1:6.14.99~git20111219.aacbd629-0ubuntu2
  ProcVersionSignature: Ubuntu 3.2.0-33.52-generic 3.2.31
  Uname: Linux 3.2.0-33-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.0.1-0ubuntu14
  Architecture: amd64
  CompizPlugins: 
[core,bailer,detection,composite,opengl,decor,compiztoolbox,grid,resize,snap,vpswitch,move,mousepoll,wall,place,imgpng,gnomecompat,unitymtgrabhandles,regex,session,animation,fade,workarounds,scale,expo,ezoom,unityshell]
  CompositorRunning: None
  Date: Sun Nov 18 14:30:50 2012
  DistUpgraded: 2012-04-29 09:57:42,118 DEBUG enabling apt cron job
  DistroCodename: precise
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes,
  GraphicsCard:
   Advanced Micro Devices [AMD] nee ATI RV710 [Mobility Radeon HD 4300 Series] 
[1002:9552] (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:3652]
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  MachineType: Hewlett-Packard Presario CQ61 Notebook PC
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-33-generic 
root=/dev/mapper/vg--hostname-lv--ubuntu ro vga=795 quiet splash vt.handoff=7
  SourcePackage: xserver-xorg-video-ati
  UpgradeStatus: Upgraded to precise on 2012-04-29 (203 days ago)
  dmi.bios.date: 10/10/2009
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: F.07
  dmi.board.name: 3652
  dmi.board.vendor: Quanta
  dmi.board.version: 42.14
  dmi.chassis.type: 10
  dmi.chassis.vendor: Quanta
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvrF.07:bd10/10/2009:svnHewlett-Packard:pnPresarioCQ61NotebookPC:pvr0392100000210D10000020000:rvnQuanta:rn3652:rvr42.14:cvnQuanta:ct10:cvrN/A:
  dmi.product.name: Presario CQ61 Notebook PC
  dmi.product.version: 0392100000210D10000020000
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.7.8-0ubuntu1.4
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.32-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.4-0ubuntu0.2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.4-0ubuntu0.2
  version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.8
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1.2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.14.99~git20111219.aacbd629-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20111201+b5534a1-1build2
  ---
  .tmp.unity.support.test.0:

  ApportVersion: 2.12.7-0ubuntu6
  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
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroRelease: Ubuntu 14.04
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] RV710/M92 [Mobility Radeon HD 
4330/4350/4550] [1002:9552] (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:3652]
  InstallationDate: Installed on 2014-01-09 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140109)
  MachineType: Hewlett-Packard Presario CQ61 Notebook PC
  MarkForUpload: True
  Package: xserver-xorg-video-ati 1:7.2.0-0ubuntu10
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-1-generic 
root=UUID=dcaf769c-8952-4172-96d9-da86251503c1 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-1.16-generic 3.13.0-rc7
  Tags:  trusty ubuntu reproducible compiz-0.9
  Uname: Linux 3.13.0-1-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 05/17/2010
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: F.15
  dmi.board.name: 3652
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 42.15
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvrF.15:bd05/17/2010:svnHewlett-Packard:pnPresarioCQ61NotebookPC:pvr0392100000210D10000020000:rvnHewlett-Packard:rn3652:rvr42.15:cvnHewlett-Packard:ct10:cvrN/A:
  dmi.product.name: Presario CQ61 Notebook PC
  dmi.product.version: 0392100000210D10000020000
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.50-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.0.1-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.0.1-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.14.5-1ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu10
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.907-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.10-1ubuntu1
  xserver.bootTime: Thu Jan  9 19:07:18 2014
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.14.5-1ubuntu2
  xserver.video_driver: radeon

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