No video during boot process with kernel 5.11

[Maciej Mo]

Kubuntu beta 21.04 installed on disk, upgraded from Kubuntu 20.10. After booting with kernel 5.11 (linux-image-5.11.0-13) if I will reboot the system, or shutdown and boot again external monitor (connected via displayport) is not waking up until SDDM is loaded - screen is turned off while grub is displayed and during whole boot process, it turns on right after SDDM is loaded and login screen appears.
This problem happens only when kernel 5.11 is in use - when I reconfigured grub so that kernel 5.8 is loaded by default and reboot system with this kernel loaded on next boot monitor is turned on propery right after turning on pc. Also after rebooting from Windows 10 (dual-boot machine) monitor works normally, so it seems that only kernel 5.11 is behaving this way.

The same situation is observed after reboting pc from Kubuntu 21.04 beta live session.

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: linux-image-5.11.0-13-generic 5.11.0-13.14
ProcVersionSignature: Ubuntu 5.11.0-13.14-generic 5.11.7
Uname: Linux 5.11.0-13-generic x86_64
ApportVersion: 2.20.11-0ubuntu61
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: maciej 1315 F.... pulseaudio
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Sun Apr 4 21:00:42 2021
InstallationDate: Installed on 2021-03-18 (16 days ago)
InstallationMedia: Kubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
MachineType: Intel(R) Client Systems NUC10i7FNH
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.11.0-13-generic root=UUID=8999c1ac-5d51-4b21-93be-ea474ed43db5 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.11.0-13-generic N/A
 linux-backports-modules-5.11.0-13-generic N/A
 linux-firmware 1.196
SourcePackage: linux
UpgradeStatus: Upgraded to hirsute on 2021-04-02 (1 days ago)
dmi.bios.date: 03/03/2021
dmi.bios.release: 5.16
dmi.bios.vendor: Intel Corp.
dmi.bios.version: FNCML357.0050.2021.0303.2141
dmi.board.asset.tag: Default string
dmi.board.name: NUC10i7FNB
dmi.board.vendor: Intel Corporation
dmi.board.version: K61360-305
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 35
dmi.chassis.vendor: Intel Corporation
dmi.chassis.version: 2.0
dmi.ec.firmware.release: 3.9
dmi.modalias: dmi:bvnIntelCorp.:bvrFNCML357.0050.2021.0303.2141:bd03/03/2021:br5.16:efr3.9:svnIntel(R)ClientSystems:pnNUC10i7FNH:pvrK61081-306:rvnIntelCorporation:rnNUC10i7FNB:rvrK61360-305:cvnIntelCorporation:ct35:cvr2.0:
dmi.product.family: FN
dmi.product.name: NUC10i7FNH
dmi.product.sku: BXNUC10i7FNH
dmi.product.version: K61081-306
dmi.sys.vendor: Intel(R) Client Systems

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

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