[Bug 1944060] Re: Black Screen after Session Unlock from Suspend

[Matthew Wendel]

*** This bug is a duplicate of bug 1911055 ***
    https://bugs.launchpad.net/bugs/1911055

This bug was discovered as duplicate - the issue persisted while the P50
was suspended & resumed while in a docking station (probably prime-
select using 'ondemand'). This is GPU driver related.

** This bug has been marked a duplicate of bug 1911055
   [modeset][nvidia] suspend/resume broken in nvidia-460 : Display engine push buffer channel allocation failed

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https://bugs.launchpad.net/bugs/1944060

Title:
  Black Screen after Session Unlock from Suspend

Status in ubuntu-meta package in Ubuntu:
  New

Bug description:
  Ubuntu Release: Ubuntu 20.04.3 LTS
  Installation Style: Minimal (selected during GUI install) (Untested against full installation style)
  Patient System Hardware Information: Lenovo ThinkPad P50 (Xenon) - Intel HD Graphics + NVIDIA Quadro M2000M (NVIDIA Prime enabled w/proprietary drivers) (GPU is not suspected to be the issue)

  Expected Behavior:
  1) Suspend the system into sleep mode. 2) Awake the system to be greeted by lock screen. 3) Type in password, press enter. 4)GNOME validates password successfully. 5) Resume user desktop session.

  Actual Behavior:
  1) Suspend the system into sleep mode. 2) Awake the system to be greeted by lock screen. 3) Type in password, press enter. 4)GNOME validates password successfully. 5) GNOME lock screen freezes - spinner stops moving but mouse cursor and keyboard are responsive (can switch TTYs). After GNOME lock screen freeze, if you switch out of TTY2 (default for GUI), and back into it, a black screen is shown. If you attempt to login via TTY1, you are switched to the black screen session in TTY2.

  Solution / Workaround:
  This behavior can be avoided by installing the "gnome-scrensaver" package. Something in this package is required by GNOME in order to successfully resume this system from suspend, even though no screen saver settings were configured after installing it.

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