Re: USB mouse and keyboard disconnected

[Mark Fletcher <mark27q1@gmail.com>]

On Thu, Nov 03, 2016 at 06:18:59PM +0200, Martin T wrote:
> Hi,
> 
> looks like the problem is either with ehci_pci or ehci_hcd because if
> I do "modprobe -rv ehci_pci" and "modprobe -v ehci_pci", then both
> keyboard and mouse start to work. "ehci_hcd" is used by "ehci_pci":
> 
> ehci_pci               12512  0
> ehci_hcd               69837  1 ehci_pci
> 
> 
Random thought -- if ehci_pci is already loaded for some other device 
early in the boot process, in a way that doesn't require the ehci_hcd 
module, and then udev detects the keyboard and mouse, determines it 
needs ehci_pci... and concludes all is well because that module is 
already loaded... But the ehci_hcd piece isn't.... And then removing it 
and re-loading it looks at the dependencies again in the light of all 
the hardware udev is aware of by that stage, and so loads the 
sub-module, and the keyboard and mouse start working...

OR, perhaps less far-fetched, could your running kernel somehow have 
access to 2 versions of the ehci_pci module, one with a dependency on 
ehci_hcd and one not? And at boot it is picking up the wrong one and 
when you run modprobe from the command line it is picking up the other?

Mark