I think different from #32.
To adding a GUI configure bpc is a long-term plan.

Before that,the default behavior should be designed to get the best user 
experience.
As we all know, there're lot of hardware components on the pipline of display 
path(e.g. socket, converter, dongle, cable, monitor)

With any lower quality component on the pipeline, dark screen or function lost 
is not acceptable.
It should be better to provide lower default bpc than dark user's screen.

Afterall, user can adjust the bpc by command in short-term or by UI in 
long-term plan.
But if we just dark user's screen, user mostly thinks the hardware is broken or 
Ubuntu provides poor compatibility(if they compare the same component to 
Windows).

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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 OEM Priority Project:
  New
Status in linux package in Ubuntu:
  Confirmed
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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