On Thu, 17 Dec 2020 at 14:39, Klaus Kusche <klaus.kusche@xxxxxxxxxxxxxxx> wrote: > > > Hello, > > On 17/12/2020 13:41, Ard Biesheuvel wrote: > >> 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). > > > > Hello Klaus, > > > > Please try reverting > > > > 4a568ce29d3f48df95919f82a80e4b9be7ea0dc1 > > > > "efi/x86: Add a quirk to support command line arguments on Dell EFI firmware" > > Thanks for the quick response. > > Efistub is *not* the culprit: > > With the patch reverted, the two efistub error messages are gone. > And with the two errormessages not occupying the display and my attention, > I noticed that the kernel actually came up for fractions of a second > before the display went dark. > > AMD radeon seems to be the culprit: > After unconfiguring it, the system comes up fine in text mode, > both with and without the efistub patch. > > And with the efistub patch applied, > dmesg actually shows an empty command line instead of the \x01, > as it should. > Thanks for reporting back, and good luck debugging the radeon driver :-)
