Xorg crashed with SIGABRT in OsAbort()

[Matteo Sis]

fails to boot with LDM

ProblemType: Crash
DistroRelease: Ubuntu 18.10
Package: xserver-xorg-core 2:1.20.1-3ubuntu1
ProcVersionSignature: Ubuntu 4.18.0-7.8-lowlatency 4.18.5
Uname: Linux 4.18.0-8-lowlatency x86_64
ApportVersion: 2.20.10-0ubuntu11
Architecture: amd64
CompositorRunning: None
CrashCounter: 1
Date: Tue Oct 2 18:09:16 2018
DistUpgraded: Fresh install
DistroCodename: cosmic
DistroVariant: ubuntu
ExecutablePath: /usr/lib/xorg/Xorg
ExtraDebuggingInterest: I just need to know a workaround
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series] [1002:15dd] (rev c8) (prog-if 00 [VGA controller])
   Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series] [1002:15dd]
InstallationDate: Installed on 2018-09-29 (3 days ago)
InstallationMedia: Ubuntu-Studio 18.10 "Cosmic Cuttlefish" - Beta amd64 (20180927.1)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcCmdline: /usr/lib/xorg/Xorg -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
ProcEnviron: PATH=(custom, no user)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-7-lowlatency root=UUID=323bc2b4-d3d7-4c76-8328-7251b2c39852 ro quiet splash
Signal: 6
SourcePackage: xorg-server
StacktraceTop:
 OsAbort ()
 ?? ()
 FatalError ()
 xf86PostProbe ()
 InitOutput ()
Title: Xorg crashed with SIGABRT in OsAbort()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

dmi.bios.date: 02/12/2018
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P4.70
dmi.board.name: AB350 Pro4
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP4.70:bd02/12/2018:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnAB350Pro4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: To Be Filled By O.E.M.
dmi.product.sku: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.94-1
version.libgl1-mesa-dri: libgl1-mesa-dri 18.2.1-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.2.1-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.20.1-3ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1build1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-3

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1673649, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.