This also happens with the kernel in xubuntu-22.04-beta-desktop- amd64.iso, so it will block me upgrading that machine to Jammy when it's released.
Is there anything I can do to help? I'm not familiar with debugging kernel drivers, but I'm a competent general developer, and I'm prepared to put in some effort if given some guidance on where to start. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-signed-oem-5.14 in Ubuntu. https://bugs.launchpad.net/bugs/1967123 Title: Hang on boot after 'fb0: switching to inteldrmfb from EFI VGA' Status in linux-signed-oem-5.14 package in Ubuntu: New Bug description: 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed-oem-5.14/+bug/1967123/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
