[Bug 1876753] [NEW] Thinkpad T430 Power Cycles instead of rebooting

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After installing Xubuntu 20.04, Thinkpad T430 does not reboot properly
any more.

Expected behavior: Power LED and HDD stay on, System reboots.

Actual behavior: System switches off (including power LED and HDD which
leads to emergency head parking and loud click noise) and switches back
on after 5 seconds.

Problem occurs with Xubuntu 20.04 and Ubuntu 20.04 even when booted from
live USB medium. It also occurs with Mainline Kernel 5.6.7 which I
installed for testing.

It does not occur with several live media used for testing (Xubuntu
18.04, Windows 10, Manjaro 20, MX 19) or when rebooted from within GRUB2
on my Xubuntu installation.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-28-generic 5.4.0-28.32
ProcVersionSignature: Ubuntu 5.4.0-28.32-generic 5.4.30
Uname: Linux 5.4.0-28-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  david      1954 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
Date: Mon May  4 17:58:49 2020
HibernationDevice: RESUME=none
InstallationDate: Installed on 2020-05-01 (3 days ago)
InstallationMedia: Xubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: LENOVO 2351BH6
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-28-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-28-generic N/A
 linux-backports-modules-5.4.0-28-generic  N/A
 linux-firmware                            1.187
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/07/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: G1ETC2WW (2.82 )
dmi.board.asset.tag: Not Available
dmi.board.name: 2351BH6
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrG1ETC2WW(2.82):bd08/07/2019:svnLENOVO:pn2351BH6:pvrThinkPadT430:rvnLENOVO:rn2351BH6:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.family: ThinkPad T430
dmi.product.name: 2351BH6
dmi.product.sku: LENOVO_MT_2351
dmi.product.version: ThinkPad T430
dmi.sys.vendor: LENOVO

** Affects: grub (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: amd64 apport-bug focal
-- 
Thinkpad T430 Power Cycles instead of rebooting
https://bugs.launchpad.net/bugs/1876753
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