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** Changed in: mutter (Ubuntu)
Status: New => Incomplete
** Tags added: displaylink
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https://bugs.launchpad.net/bugs/1873401
Title:
xorg lock-up on GPU hotplug
Status in mutter package in Ubuntu:
Incomplete
Bug description:
Discovered when testing EVDI-backed screen
(https://github.com/DisplayLink/evdi).
While adding new device /dev/dri/cardX xorg locks, it can be observed by the
cursors that stop blinking or menus not responding. Sometimes it is just a
short (1-2 sec.) pause, but sometimes (hard to state the exact reproduction
rate, rather rarely) the screen stops completely.
Interestingly enough, if using HW cursor, it moves fine. Keyboard is at least
partially functional, as it's possible to "bail out" to tty with C-A-Fx and
kill the session. Anything else is difficult to check, as nothing really
happens on the screen, it just remains frozen.
When adding 4 GPUs at once (e.g. via config in /etc/modprobe.d according to
https://support.displaylink.com/knowledgebase/articles/1843660-screen-freezes-after-opening-an-application-only).
Haven't checked other numbers yet, to be done soon.
The problem occurs, when adding the devices, not enabling their associated
screens/reading EDID or anything like that.
Also, to be checked with UDL, similar behaviour is expected, but due to the
fact that it adds only a single device at a time reproducing "complete" freeze
might be difficult.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xserver-xorg-core 2:1.20.8-2ubuntu2
ProcVersionSignature: Ubuntu 5.4.0-24.28-generic 5.4.30
Uname: Linux 5.4.0-24-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Fri Apr 17 09:24:35 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
Intel Corporation 4th Gen Core Processor Integrated Graphics Controller
[8086:0416] (rev 06) (prog-if 00 [VGA controller])
Subsystem: Dell 4th Gen Core Processor Integrated Graphics Controller
[1028:060d]
Subsystem: Dell GK107GLM [Quadro K1100M] [1028:060d]
InstallationDate: Installed on 2020-04-16 (0 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200415)
MachineType: Dell Inc. Dell Precision M3800
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-24-generic
root=UUID=e0a7aba8-1c09-4367-9d6b-c74b73017fb4 ro quiet splash vt.handoff=7
SourcePackage: xorg-server
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/25/2018
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A12
dmi.board.name: Dell Precision M3800
dmi.board.vendor: Dell Inc.
dmi.board.version: A12
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias:
dmi:bvnDellInc.:bvrA12:bd05/25/2018:svnDellInc.:pnDellPrecisionM3800:pvrA12:rvnDellInc.:rnDellPrecisionM3800:rvrA12:cvnDellInc.:ct8:cvrNotSpecified:
dmi.product.name: Dell Precision M3800
dmi.product.sku: Dell Precision M3800
dmi.product.version: A12
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2
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+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
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