On Thu, 17 Dec 2020 at 13:37, Klaus Kusche <klaus.kusche@xxxxxxxxxxxxxxx> wrote: > > > Hello, > > tried to boot 5.10.1 (my first attempt to boot a 5.10.x). > > Displays > > EFI stub: WARNING: [Firmware Bug]: LoadOptions is an EFI_LOAD_OPTION descriptor > EFI stub: WARNING: [Firmware Bug]: Using OptionalData as a workaround > > for one or two seconds on the notebook display. > > Then, the notebook display becomes completely black > and the notebook does not boot and does not react to anything > (hard poweroff needed). > > 5.9.15 works fine. > > Of course, this could be some other change 5.9 --> 5.10, > but I think Efistub is the first suspect. > > Directly booting from UEFI to linux, no bootloader. > > Dell Precision Mobile 7740, > dmidecode says BIOS version 1.7.0, 01/07/2020. > > My kernel has *no* command line arguments at all > or at least, it should not have any > (fully static kernel with no modules or initrd, > all kernel parameters configured into the kernel). > > In 5.9.15, dmesg displays only a \x01 for the command line. > > Next step? > Is there sonething to try out? > Are there any patches I should reverse-apply? > Should I open a bug at buzilla.kernel.org? > > Thanks for any help! > Hello Klaus, Please try reverting 4a568ce29d3f48df95919f82a80e4b9be7ea0dc1 "efi/x86: Add a quirk to support command line arguments on Dell EFI firmware" If this fixes things, I will let Arvind come back to you with more detailed questions about your use case, although I suspect it may have something to do with not having a command line at all. Thanks, Ard.
