Thanks that does seem to be an old EDID v1.3 with no defined bit depth.
But there are some vendor-specific blocks there that do advertise
support for 10bpc and 12bpc.
In this case I think it's correct to try and default to 10bpc or 12bpc.
It's probably only the cable or dongle letting it down. I wonder if such
limited cable bandwidth is something we can detect in software?...
Imagine (or please test) what a newer monitor with an EDID v1.4 would
do. If that reported more definite support for 10bpc then it would be
even more correct to try and default to 10bpc. But we would also need
more intelligent logic (somewhere) that detects when the desired
bandwidth isn't being achieved due to cable or dongle problems.
** Changed in: xorg-server (Ubuntu)
Importance: Undecided => Medium
** Changed in: xorg-server (Ubuntu)
Status: Incomplete => Triaged
** Changed in: oem-priority
Status: Incomplete => New
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Also affects: mutter (Ubuntu)
Importance: Undecided
Status: New
** Changed in: mutter (Ubuntu)
Importance: Undecided => Medium
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1890772
Title:
Some external 4K monitor is not working properly
Status in OEM Priority Project:
New
Status in linux package in Ubuntu:
New
Status in mutter package in Ubuntu:
New
Status in xorg-server package in Ubuntu:
Triaged
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.
---
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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