Public bug reported:

When the power saving mode is on, the screen of my pc black out after 15
mins. While I press the key or click the mouse, the login interface
shows up, but after input the key pass, it still stuck on the login
page, and the desktop window didn't appear.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-29-generic 5.4.0-29.33
ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
Uname: Linux 5.4.0-29-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  norah     305119 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed May  6 23:39:20 2020
HibernationDevice: RESUME=UUID=ae9d7101-3e17-4133-ac4b-c4b858d77858
InstallationDate: Installed on 2017-09-02 (977 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 005: ID 0bda:818b Realtek Semiconductor Corp. RTL8192EU 
802.11b/g/n WLAN Adapter
 Bus 001 Device 004: ID 1532:0214 Razer USA, Ltd BlackWidow Ultimate 2016
 Bus 001 Device 003: ID 17ef:6019 Lenovo Lenovo Optical USB Mouse
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: LENOVO 90E8CTO1WW
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-29-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-29-generic N/A
 linux-backports-modules-5.4.0-29-generic  N/A
 linux-firmware                            1.187
RfKill:
 1: phy1: Wireless LAN
        Soft blocked: yes
        Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/24/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: M05KT54A
dmi.board.name: SKYBAY
dmi.board.vendor: LENOVO
dmi.board.version: NOK
dmi.chassis.type: 3
dmi.chassis.vendor: LENOVO
dmi.modalias: 
dmi:bvnLENOVO:bvrM05KT54A:bd02/24/2016:svnLENOVO:pn90E8CTO1WW:pvrYangTianM4900c-00:rvnLENOVO:rnSKYBAY:rvrNOK:cvnLENOVO:ct3:cvr:
dmi.product.family: YangTianM4900c-00
dmi.product.name: 90E8CTO1WW
dmi.product.sku: LENOVO_MT_90E8_BU_LENOVO_FM_YangTianM4900c-00
dmi.product.version: YangTianM4900c-00
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1877143

Title:
  When input the login password the log interface doesn't disappear and
  log into the desktop window

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