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

[John J. Karcher]

On 1/20/21 4:26 AM, Christian Helmuth wrote:
> 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].

Added as ticket #3997, with the above command outputs attached.

  Thanks!

   John J. Karcher
   devuser at alternateapproach.com