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

[Bill Hayden]

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.

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1691174

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Bill Hayden (hayden-haydentech)]

apport information

[Bill Hayden (hayden-haydentech)]

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[Bill Hayden (hayden-haydentech)]

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[Bill Hayden (hayden-haydentech)]

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[Bill Hayden (hayden-haydentech)]

apport information

[Bill Hayden (hayden-haydentech)]

apport information

[Bill Hayden (hayden-haydentech)]

apport information

[Bill Hayden (hayden-haydentech)]

apport information

[Bill Hayden (hayden-haydentech)]

apport information

[Bill Hayden (hayden-haydentech)]

apport information

[Bill Hayden (hayden-haydentech)]

apport information

[Bill Hayden (hayden-haydentech)]

apport information

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream stable kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.4 stable kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.68

[Bill Hayden (hayden-haydentech)]

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

[Alexander (lamerman)]

I have similar bug with 4.13.0-25-generic.

lspci -k | grep -EA3 'VGA'
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Curacao XT / Trinidad XT [Radeon R7 370 / R9 270X/370X]
        Subsystem: ASUSTeK Computer Inc. Curacao XT / Trinidad XT [Radeon R7 370 / R9 270X/370X]
        Kernel modules: radeon, amdgpu
01:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde/Pitcairn HDMI Audio [Radeon HD 7700/7800 Series]

log:

[ 6.652] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[ 6.652] (II) FBDEV: driver for framebuffer: fbdev
[ 6.652] (II) VESA: driver for VESA chipsets: vesa
[ 6.653] (II) [KMS] drm report modesetting isn't supported.
[ 6.653] (EE) open /dev/dri/card0: No such file or directory
[ 6.653] (WW) Falling back to old probe method for modesetting
[ 6.653] (EE) open /dev/dri/card0: No such file or directory