USB Error on ThinkPad Convertible (was: Re: Sculpt 20.11 - Blank Screen On ThinkPad Convertible)

Christian Helmuth christian.helmuth at
Wed Jan 20 10:26:17 CET 2021

Hello John,

thanks for your efforts to pin down the issue. It's unfortunate that
usb_drv just dies on your Yoga because it's essential for report_dump
to work.

On Tue, Jan 19, 2021 at 22:28:33 CET, John J. Karcher wrote:
> [core] Warning: unresolvable exception 13, pd 'init -> drivers -> usb_drv',
> thread 'ep', cpu 0, ip=0x1005afc sp=40bfe7c0 bp=0x1410a450 no signal handler

This message tells us that usb_drv raised a General Protection Fault,
which can have many (fatal) reasons in the driver [1]. In the past,
the cause was often  misaligned pointer (incl. the stack pointer) in
combination with FPU/SSE instructions, but it would be a wild guess in
your case and also does not help to pin down the location in code.

Could you share some more information about the hardware specs of the
Yoga? For example with a Live Linux

  sudo lspci -vvvnn
  sudo lsusb -vvv
  sudo lshw  -sanitize

Also, I suggest to move the bug hunt to a dedicated issue on GitHub [2].


Christian Helmuth
Genode Labs · · /ˈdʒiː.nəʊd/

Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden
Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth

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