Public bug reported:
Regression with Ryzen 3 2200G, UEFI Asrock B450 Pro4 motherboard and
55-75 Hz monitor.
Booting Xubuntu 19.10 live iso with safe graphics options did give a
stable desktop display, but
xubuntu@xubuntu:~$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1920 x 1080, current 1920 x 1080, maximum 1920 x 1080
default connected 1920x1080+0+0 0mm x 0mm
1920x1080 77.00*
xubuntu@xubuntu:~$
The monitor is only supposed to have a maximum vertical refresh rate of
75 Hz. Xrandr reports 77 Hz as the only choice. The monitor reports 60
Hz, not that I trust the monitor.
Swapping monitors and running many reboots the situation seems to be...
Old versions of Ubuntu (Bionic and Dingo) can handle the hardware.
Standard boot sometimes gives a blank screen.
Standard boot sometimes gives a badly pixelated display
(Ctl-Alt-F6, Ctl-Alt-F7 temporarily improves it).
Connecting a 144 Hz monitor convinces something (the firmware?)
that fast refreshes are OK on a slow monitor, or at least it fails to
reread and abide by the slow monitor's limitations when swapping back.
Something, I don't know what, convinces the computer to run the display
at 60 Hz, sometimes.
The motherboard has three video ports; DP, HDMI and VGA (using an onboard
DP? to VGA converter chip). The fast monitor has DP, HDMI and VGA ports,
but I only experimented with the DP connection. The slow monitor has VGA and
DVI-D ports. I experimented with VGA to VGA and HDMI via a passive adapter
to DVI. When running in the badly pixelated mode xorg seems to think that
the VGA port is "DP-1".
ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: xorg 1:7.7+19ubuntu12
ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
Uname: Linux 5.3.0-18-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu8
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperVersion: 1.427
CompositorRunning: None
CurrentDesktop: XFCE
Date: Sun Oct 20 00:17:34 2019
DistUpgraded: Fresh install
DistroCodename: eoan
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
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]
LiveMediaBuild: Xubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/username.seed
quiet splash nomodeset ---
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/02/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P3.40
dmi.board.name: B450 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.:bvrP3.40:bd07/02/2019:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnB450Pro4: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 2.4.99-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 19.2.1-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.5+git20191008-0ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-1ubuntu1
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: Sat Oct 19 23:52:52 2019
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: 2:1.20.5+git20191008-0ubuntu1
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug eoan ubuntu
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https://bugs.launchpad.net/bugs/1848900
Title:
blank display with Eoan Ermine live DVD on Rysen 2200G
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