Public bug reported:
I'm running Ubuntu 20.04 with HWE kernels. The 5.11 kernel stream has
been working fine for me (and supported the network device on my
reasonably recent PC, which 20.04's default kernel didn't). But the 5.13
and 5.14 kernels all hang on boot.
If I edit the GRUB boot commands to let me see the boot messages, the
hang occurs immediately after printing the message
[ 1.044456] fb0: switching to inteldrmfb from EFI VGA
I can boot this kernel fine if I add 'nomodeset' to the kernel command
line. But then I get unusably low screen resolution. Instead, my
workaround is to manually select a 5.11 kernel from the GRUB menu on
every boot.
I'm not able to provide a full set of kernel messages from a failed boot
attempt, because of course the kernel doesn't boot to a point where I
can save them to a file. But I attach a screenshot of the last screenful
of messages before the hang, in case those are useful. I'll also attach
dmesg logs from a successful boot of the 5.14 kernel with nomodeset, and
from a boot of the 5.11 kernel which gives me full functionality.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.14.0-1031-oem 5.14.0-1031.34
ProcVersionSignature: Ubuntu 5.11.0-46.51~20.04.1-generic 5.11.22
Uname: Linux 5.11.0-46-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
Date: Wed Mar 30 12:47:47 2022
InstallationDate: Installed on 2013-06-01 (3223 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
SourcePackage: linux-signed-oem-5.14
UpgradeStatus: Upgraded to focal on 2020-08-31 (575 days ago)
modified.conffile..etc.default.apport: [modified]
mtime.conffile..etc.default.apport: 2013-06-02T15:20:08.886312
** Affects: linux-signed-oem-5.14 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
** Attachment added: "kernelcrash.jpeg"
https://bugs.launchpad.net/bugs/1967123/+attachment/5574747/+files/kernelcrash.jpeg
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https://bugs.launchpad.net/bugs/1967123
Title:
Hang on boot after 'fb0: switching to inteldrmfb from EFI VGA'
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