My system worked correctly with the mainline 4.4.68 kernel, so it
appears to be fixed upstream.

** Tags added: kernel-fixed-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

** Description changed:

- After upgrading from 4.4.0-63 to 4.4.0-64, X.org will no longer load my
- Radeon card and I am presented with a low-res fallback desktop.
+ After upgrading from Kernel 4.4.0-63 to 4.4.0-64, X.org will no longer
+ load my Radeon card and I am presented with a low-res fallback desktop.
  Reverting to the 4.4.0-63 kernel restores ability of X.org to load the
  Radeon driver.
- 
  
  I receive the following message in Xorg.0.log:
  
  [ 36.346] (EE) open /dev/dri/card0: No such file or directory
  
- 
  lspci shows this card installed:
  
  01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] 
Cedar [Radeon HD 5000/6000/7350/8350 Series]
- --- 
+ ---
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 
not found.
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 16.04
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=7c82e9d2-2425-42ea-a16f-6cf5e923ff43
  InstallationDate: Installed on 2014-01-31 (1200 days ago)
  InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016)
  IwConfig:
-  lo        no wireless extensions.
-  
-  eth2      no wireless extensions.
+  lo        no wireless extensions.
+ 
+  eth2      no wireless extensions.
  MachineType: Dell Inc. OptiPlex 990
  Package: linux (not installed)
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-64-generic 
root=/dev/mapper/xubuntu--vg-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-64.85-generic 4.4.44
  RelatedPackageVersions:
-  linux-restricted-modules-4.4.0-64-generic N/A
-  linux-backports-modules-4.4.0-64-generic  N/A
-  linux-firmware                            1.157.8
+  linux-restricted-modules-4.4.0-64-generic N/A
+  linux-backports-modules-4.4.0-64-generic  N/A
+  linux-firmware                            1.157.8
  RfKill:
-  
+ 
  Tags:  xenial
  Uname: Linux 4.4.0-64-generic x86_64
  UpgradeStatus: Upgraded to xenial on 2016-05-09 (372 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 09/10/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A07
  dmi.board.name: 06D7TR
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 6
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA07:bd09/10/2011:svnDellInc.:pnOptiPlex990:pvr01:rvnDellInc.:rn06D7TR:rvrA00:cvnDellInc.:ct6:cvr:
  dmi.product.name: OptiPlex 990
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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https://bugs.launchpad.net/bugs/1691174

Title:
  Kernel 4.4.0-64 fails to provide /dev/dri/card0 for Radeon card

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