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
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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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