Don’t worry: I stick with “real” DP. Is this still in scope? Anyway I am
still able to connect via HDMI and check if the bug still exists.

Am 22. Februar 2021 06:57:38 MEZ schrieb Daniel van Vugt 
<1915...@bugs.launchpad.net>:
>Please don't try "DP connected via usb" because that would introduce a
>new set of potential bugs that would confuse the issue here. Or if you
>do start using "DP connected via usb" then we should close this bug and
>open new ones.
>
>-- 
>You received this bug notification because you are subscribed to the bug
>report.
>https://bugs.launchpad.net/bugs/1915382
>
>Title:
>  external Monitor shows »No Signal« after dpms sleep
>
>Status in xorg-server package in Ubuntu:
>  New
>
>Bug description:
>  My external Monitor connected via HDMI is behaving strange and my
>  educated guess is it is related to dpms.
>
>  Plugging in the monitor it will show »No Signal« although recognized
>  by `xrandr`. I would have to boot my machine with the monitor plugged
>  in to make it work. When going to standby (screen blanks after lock,
>  then screen goes to standby) the monitor is switched on (LED is going
>  white) and shortly after it will show the no-signal-message. `xrandr`
>  claims the monitor to be existent. Unplugging and replugging does not
>  help. Same happens when logging out to greeter. Strange in so far as
>  when booting up, the greeter is okay with the monitor.
>
>  When issuing `xset -dpms` the behaviour changes and the monitor will
>  enter sleep and come back as expected when locking the session.
>
>  Console (tty1-6) is available though at all times.
>
>  (I generated the bug report with dpms set off accidentally)
>
>  ProblemType: Bug
>  DistroRelease: Ubuntu 20.04
>  Package: xorg 1:7.7+19ubuntu14
>  ProcVersionSignature: Ubuntu 5.4.0-65.73-generic 5.4.78
>  Uname: Linux 5.4.0-65-generic x86_64
>  ApportVersion: 2.20.11-0ubuntu27.16
>  Architecture: amd64
>  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
>  CasperMD5CheckResult: skip
>  CompositorRunning: None
>  CurrentDesktop: Regolith:GNOME-Flashback:GNOME
>  Date: Thu Feb 11 09:51:33 2021
>  DistUpgraded: Fresh install
>  DistroCodename: focal
>  DistroVariant: ubuntu
>  ExtraDebuggingInterest: Yes
>  GraphicsCard:
>   Intel Corporation UHD Graphics [8086:9bc4] (rev 05) (prog-if 00 [VGA 
> controller])
>     Subsystem: Dell Device [1028:09c3]
>  InstallationDate: Installed on 2021-02-10 (0 days ago)
>  InstallationMedia: Regolith 20.04.0 1.4.1 LTS amd64 (20200511)
>  MachineType: Dell Inc. Precision 7550
>  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-65-generic 
> root=/dev/mapper/vgregolith-root ro quiet splash vt.handoff=7
>  SourcePackage: xorg
>  UpgradeStatus: No upgrade log present (probably fresh install)
>  dmi.bios.date: 07/15/2020
>  dmi.bios.vendor: Dell Inc.
>  dmi.bios.version: 1.3.2
>  dmi.board.name: 090NVT
>  dmi.board.vendor: Dell Inc.
>  dmi.board.version: A01
>  dmi.chassis.type: 10
>  dmi.chassis.vendor: Dell Inc.
>  dmi.modalias: 
> dmi:bvnDellInc.:bvr1.3.2:bd07/15/2020:svnDellInc.:pnPrecision7550:pvr:rvnDellInc.:rn090NVT:rvrA01:cvnDellInc.:ct10:cvr:
>  dmi.product.family: Precision
>  dmi.product.name: Precision 7550
>  dmi.product.sku: 09C3
>  dmi.sys.vendor: Dell Inc.
>  version.compiz: compiz N/A
>  version.libdrm2: libdrm2 2.4.102-1ubuntu1~20.04.1
>  version.libgl1-mesa-dri: libgl1-mesa-dri 20.2.6-0ubuntu0.20.04.1
>  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
>  version.xserver-xorg-core: xserver-xorg-core 2:1.20.9-2ubuntu1.2~20.04.1
>  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
>
>To manage notifications about this bug go to:
>https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1915382/+subscriptions

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https://bugs.launchpad.net/bugs/1915382

Title:
  external Monitor shows »No Signal« after dpms sleep

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1915382/+subscriptions

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