According to your XorgLog.txt it looks like the choice of 75Hz is coming
from the AMDGPU driver:
[ 97.816] (II) AMDGPU(0): Modeline "3840x1600"x75.0 566.25 3840
4016 4104 4400 1600 1607 1617 1716 +hsync -vsync (128.7 kHz eP)
However the AMDGPU driver is also confused by the monitor's aspect
ratio, which might be the problem:
[ 97.816] (WW) AMDGPU(0): Output HDMI-A-0: Strange aspect ratio (879/366),
consider adding a quirk
[ 97.816] (WW) AMDGPU(0): Output HDMI-A-0: Strange aspect ratio (879/366),
consider adding a quirk
[ 97.816] (WW) AMDGPU(0): Output HDMI-A-0: Strange aspect ratio (879/366),
consider adding a quirk
Does the same monitor work when plugged into an Intel or Nvidia GPU?
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Summary changed:
- Screen flickering on ultra wide
+ [amdgpu + nvidia PCI passthrough] Screen flickering on ultra wide
** Tags added: amdgpu nvidia radeon
** Also affects: xserver-xorg-video-amdgpu (Ubuntu)
Importance: Undecided
Status: New
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
** Changed in: xserver-xorg-video-amdgpu (Ubuntu)
Status: New => Incomplete
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Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1811863
Title:
[amdgpu + nvidia PCI passthrough] Screen flickering on ultra wide
Status in xorg-server package in Ubuntu:
Incomplete
Status in xserver-xorg-video-amdgpu package in Ubuntu:
Incomplete
Bug description:
I'm running 18.04 including all updates on an LG 38WK95C at
3840x1600@75. I'm experiencing constant flickering on screen when
setting the refresh rate to 75Hz in settings. When I set to refresh
rate to 60Hz, the flicking is gone.
When enabeling freesync in the monitor's settings, the 60Hz isn't
available and the only choices are 29.99Hz or 75Hz, which again causes
flickering.
This looks like the same issue in bug #1749975.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7.1
ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
Uname: Linux 4.15.0-43-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Tue Jan 15 16:43:10 2019
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
DkmsStatus:
amdgpu, 18.50-708488, 4.15.0-43-generic, x86_64: installed
nvidia, 415.25, 4.15.0-29-generic, x86_64: installed
nvidia, 415.25, 4.15.0-43-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
NVIDIA Corporation Device [10de:1f02] (rev a1) (prog-if 00 [VGA controller])
Subsystem: Micro-Star International Co., Ltd. [MSI] Device [1462:3734]
Advanced Micro Devices, Inc. [AMD/ATI] Polaris12 [1002:699f] (rev c7)
(prog-if 00 [VGA controller])
Subsystem: Micro-Star International Co., Ltd. [MSI] Lexa PRO [Radeon RX
550] [1462:8a90]
InstallationDate: Installed on 2019-01-02 (12 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64
(20180725)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-43-generic
root=UUID=9ac85046-be6e-411d-a51c-10b221c750d0 ro splash quiet iommu=1
amd_iommu=on vt.handoff=1
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/18/2018
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.80
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.:bvrP1.80:bd12/18/2018: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.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 2.4.91-2
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~18.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~18.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
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