On Sunday, 20 August 2017 10:39:51 BST Bill Kenworthy wrote:
> On 20/08/17 17:21, Alan McKinnon wrote:
> > On 20/08/2017 05:47, Bill Kenworthy wrote:
> >> Hi all,
> >> 
> >> 	I am getting random lockups on kernel 4.12.5.
> >> 
> >> Three intel hosts (atom, early i7, i7 haswell) - its worse after a
> >> suspend resume session.  Because these are in use Ive gone back to
> >> 4.9.34 which is stable.
> >> 
> >> I also have some VM's and an MS surface pro 4 which are stable on
> >> 4.12.5, 6 and 8) - confusing!
> >> 
> >> Is anyone else seeing this?
> >> 
> >> BillK
> > 
> > Neil's reply elsewhere to Ralph may have the smoking gun clue.
> > 
> > I'm seeing changes in 4.12 too and haven't bothered looking further as
> > 4.11 still works for me. My external monitors and USB keyboard & mouse
> > on laptops stopped working with 4.12 and other silliness which I forget.
> > 
> > My techie spidey-sense is telling me it all smells a lot like someone
> > tidied up .config and things moved around, so make oldconfig got confused.
> 
> Not to mention changing the bcache device numbering - instead of
> /dev/bacache0, /dev/bcache1 etc. its become /dev/bcache0, /dev/bcache16,
> /dev/bcache32, ... (offset of 16)
> 
> That bit me too ...
> 
> BillK

When running make oldconfig, which I prefer because it asks me to confirm 
settings for all new modules, Alan should make sure CONFIG_USB=y is set so.  
From what I recall the oldconfig default setting is 'not set', so user input 
is required.

Unfortunately, I have no idea why Bill's hard lockups occur.
-- 
Regards,
Mick