Re: [ 12/75] USB: EHCI: work around silicon bug in Intels EHCI controllers

Alan Stern
2013-03-19T21:00:46Z

On Tue, 19 Mar 2013, Sven Joachim wrote:

> On 2013-03-19 21:10 +0100, Alan Stern wrote:
>
> > On Tue, 19 Mar 2013, Sven Joachim wrote:
> >
> >> > In what way is resume broken?
> >>
> >> The kernel comes back, but the screen is black. Manually switching VT's
> >> is possible, and if I type something I can see it on the screen, but
> >> there is no response and the cursor does not blink. It looks as if the
> >> VT is not switched backed on resume, and userspace tasks are not
> >> restarted. Sysrq combinations apparently work, but produce no output.
> >
> > Are there any other problems? For example, even before you do a
> > suspend, if you type Alt-SysRq-W do you see any processes listed?
>
> No.
>
> > There was another report on the linux-usb mailing list today of this
> > same patch causing the khubd task to hang. I'm thinking that you might
> > be facing a similar problem.
>
> Maybe, but before the suspend everything seems to be normal.

Just out of curiosity, does the patch posted here:

http://marc.info/?l=linux-usb&m=136361874807411&w=2

make any difference?

Alan Stern