[Bug 1890772] Re: No signal on 4K 60Hz DisplayPort monitor by default, until "max bpc" is lowered to 8

** Changed in: gnome-control-center
Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1890772

Title:
No signal on 4K 60Hz DisplayPort monitor by default, until "max bpc"
is lowered to 8

Status in gnome-control-center:
Fix Released
Status in HWE Next:
Fix Released
Status in Linux:
Unknown
Status in Mutter:
New
Status in OEM Priority Project:
Fix Released
Status in X.Org X server:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in mutter package in Ubuntu:
Won't Fix
Status in xorg-server package in Ubuntu:
Invalid

Bug description:
The bug is originated from,
https://bugs.launchpad.net/somerville/+bug/1887915/
https://bugs.launchpad.net/somerville/+bug/1886778

It has some problem when user connect to external 4K monitor with refresh rate 60.
The problem can be solved by lower the bpc, or lower the refresh rate.

`xrandr --output DP-3 --set "max bpc" 8`

Would like to open this bug to open discussion for enhancing user
experience.

existed upstream bug:
- https://gitlab.freedesktop.org/drm/intel/-/issues/1890

---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.4
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
DistUpgraded: Fresh install
DistributionChannelDescriptor:
 # This is the distribution channel descriptor for the OEM CDs
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-focal-amd64-20200502-85+fossa-samwell-tgl+X42
DistroCodename: focal
DistroRelease: Ubuntu 20.04
DistroVariant: ubuntu
DkmsStatus: nvidia, 440.100, 5.6.0-1021-oem, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation Device [8086:9a49] (rev 01) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:09fc]
   Subsystem: Dell GP107M [GeForce MX350] [1028:09fc]
InstallationDate: Installed on 2020-08-07 (0 days ago)
InstallationMedia: Ubuntu 20.04 "Focal" - Build amd64 LIVE Binary 20200502-05:58
Package: xorg 1:7.7+19ubuntu14 [origin: unknown]
PackageArchitecture: amd64
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.6.0-1021-oem root=UUID=41be2253-410a-4ef7-a096-4193a58efdbd ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.6.0-1021.21-oem 5.6.19
Tags: third-party-packages focal ubuntu
Uname: Linux 5.6.0-1021-oem x86_64
UnreportableReason: This is not an official Ubuntu package. Please remove any third party package and try again.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.2
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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