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. -- 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/1691174 Title: Kernel 4.4.0-64 fails to provide /dev/dri/card0 for Radeon card Status in linux package in Ubuntu: Confirmed Bug description: 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. 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 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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