[Bug 1900887] [NEW] Screensaver lock screen incomplete and doesn't work properly for mult-head setup.

[Kent Lion]

Public bug reported:

After upgrading to 20.04 on a dual monitor setup using multi-head
settings for each monitor, when I boot, the wallpaper defined for each
screen is properly displayed. When I log on, the wallpaper defined for
each screen is properly displayed in each workspace. However, when the
screensaver kicks in, the lock screen only uses the wallpaper from the
(portrait oriented) primary monitor, which doesn't fit too well on the
landscape oriented secondary monitor. Never had that problem in 18.04,
so I'm guessing the problem is that multi-head considerations were
forgotten when the screensaver was separated from the power manager for
20.04. I don't know what package the screensaver is part of.

Also, on the 18.04 startup login screen and screensaver lock screens,
moving the mouse between monitors causes the login dialog to move to the
screen that the mouse cursor is on. This does not occur with the 20.04
screensaver lock screen, though it does occur with the login screens, so
that's either an omission or a bug in the screensaver.

To reproduce the bug(s)/problems, on a dual monitor system set up so
that each monitor displays a different wallpaper when logged on and
logged off, and also from each other and in all workspaces, set the
screensaver to lock after 5 minutes or less and let it lock with the
mouse cursor left on the primary screen and then again with the mouse
cursor left on the secondary screen.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.28
ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
Uname: Linux 5.4.0-52-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: XFCE
Date: Wed Oct 21 13:07:21 2020
InstallationDate: Installed on 2019-11-29 (327 days ago)
InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: Upgraded to focal on 2020-10-20 (1 days ago)
VarLogDistupgradeXorgFixuplog:
 INFO:root:/usr/bin/do-release-upgrade running
 INFO:root:No xorg.conf, exiting

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 dist-upgrade focal screensaver

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https://bugs.launchpad.net/bugs/1900887

Title:
  Screensaver lock screen incomplete and doesn't work properly for mult-
  head setup.

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  After upgrading to 20.04 on a dual monitor setup using multi-head
  settings for each monitor, when I boot, the wallpaper defined for each
  screen is properly displayed. When I log on, the wallpaper defined for
  each screen is properly displayed in each workspace. However, when the
  screensaver kicks in, the lock screen only uses the wallpaper from the
  (portrait oriented) primary monitor, which doesn't fit too well on the
  landscape oriented secondary monitor. Never had that problem in 18.04,
  so I'm guessing the problem is that multi-head considerations were
  forgotten when the screensaver was separated from the power manager
  for 20.04. I don't know what package the screensaver is part of.

  Also, on the 18.04 startup login screen and screensaver lock screens,
  moving the mouse between monitors causes the login dialog to move to
  the screen that the mouse cursor is on. This does not occur with the
  20.04 screensaver lock screen, though it does occur with the login
  screens, so that's either an omission or a bug in the screensaver.

  To reproduce the bug(s)/problems, on a dual monitor system set up so
  that each monitor displays a different wallpaper when logged on and
  logged off, and also from each other and in all workspaces, set the
  screensaver to lock after 5 minutes or less and let it lock with the
  mouse cursor left on the primary screen and then again with the mouse
  cursor left on the secondary screen.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.28
  ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
  Uname: Linux 5.4.0-52-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.9
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Wed Oct 21 13:07:21 2020
  InstallationDate: Installed on 2019-11-29 (327 days ago)
  InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: dist-upgrade
  UpgradeStatus: Upgraded to focal on 2020-10-20 (1 days ago)
  VarLogDistupgradeXorgFixuplog:
   INFO:root:/usr/bin/do-release-upgrade running
   INFO:root:No xorg.conf, exiting

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