[amdgpu] 2nd display stopped working

[Robert C Jennings]

The 2nd display (attached to DVI) has stopped being detected but is used by bios and grub (output ceases once the spinning boot animation starts). I was away for a week but it was working prior to leaving. I've notices that Xorg.0.log shows DVI-D-0 disconnected where the 2nd monitor should be.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-14.17-generic 5.4.18
Uname: Linux 5.4.0-14-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu18
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Mon Mar 9 06:13:23 2020
DistUpgraded: 2020-01-31 09:33:31,151 DEBUG Running PostInstallScript: './xorg_fix_proprietary.py'
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] [1002:67df] (rev cf) (prog-if 00 [VGA controller])
   Subsystem: XFX Pine Group Inc. Radeon RX 470 [1682:9470]
InstallationDate: Installed on 2017-04-21 (1052 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Beta amd64 (20170404)
MachineType: Micro-Star International Co., Ltd. MS-7A34
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-14-generic root=UUID=1bf886cb-50ea-4487-a660-07d91bbb51fc ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: Upgraded to focal on 2020-01-31 (37 days ago)
dmi.bios.date: 01/23/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.M0
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: B350 TOMAHAWK (MS-7A34)
dmi.board.vendor: Micro-Star International Co., Ltd.
dmi.board.version: 1.0
dmi.chassis.asset.tag: To be filled by O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Micro-Star International Co., Ltd.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.M0:bd01/23/2019:svnMicro-StarInternationalCo.,Ltd.:pnMS-7A34:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnB350TOMAHAWK(MS-7A34):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: MS-7A34
dmi.product.sku: To be filled by O.E.M.
dmi.product.version: 1.0
dmi.sys.vendor: Micro-Star International Co., Ltd.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.100-4
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.0-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 20.0.0-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.20.7-2ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20190815-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
xserver.bootTime: Mon Oct 15 10:44:00 2018
xserver.configfile: default
xserver.errors:
 open /dev/dri/card0: No such file or directory
 open /dev/dri/card0: No such file or directory
 Screen 0 deleted because of no matching config section.
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:

xserver.version: 2:1.20.1-3ubuntu2

[Robert C Jennings (rcj)]

The log shows "open /dev/dri/card0: No such file or directory" but it does exist:

$ ls -l /dev/dri/card0
crw-rw----+ 1 root render 226, 0 Mar 9 06:12 /dev/dri/card0

Unplugging the display from DVI-D-0 and plugging it back in does not result in showing up in xrandr output.

[Robert C Jennings (rcj)]

Attaching the 2nd display via DisplayPort rather than DVI allows me to use it again, so I happen to have a solution, but not everyone may be so lucky.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Timo Aaltonen (tjaalton)]

"stopped being detected" after what

[Sebastien Bacher (seb128)]

Thank you for the bug report. The issue is too specific/didn't get enough report to be targetted as rls issue at the moment but would still be a nice one to get look at/debugged/resolved