linux-kernel - Re: Dell XPS13 does not suspend with Linux 4.10-rc3

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Date:   Wed, 11 Jan 2017 10:36:22 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     Jan Niehusmann <jan@...dor.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thorsten Leemhuis <linux@...mhuis.info>,
        Daniel Blueman <daniel@...ra.org>,
        Len Brown <len.brown@...el.com>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Alexander Usyskin <alexander.usyskin@...el.com>
Subject: Re: Dell XPS13 does not suspend with Linux 4.10-rc3

On Wed, Jan 11, 2017 at 09:53:38AM +0100, Paul Menzel wrote:
> Dear Linux folks,
> 
> 
> On 01/10/17 23:24, Jan Niehusmann wrote:
> > On Tue, Jan 10, 2017 at 09:43:31PM +0100, Jan Niehusmann wrote:
> > > And I bisected the issue to commit 7279b238ba, "mei: send OS type to the
> > > FW"
> > 
> > Indeed, just disabling the FIXUP implemented by that commit fixes
> > suspend for me, with 4.10.0-rc3. Btw, this is on a Thinkpad x201s.
> > 
> > (For the addressees newly added to cc, it seems like the mentioned
> > commit breaks suspend to ram on Dell XPS13 and Thinkpad x201s)
> > 
> > --- a/drivers/misc/mei/bus-fixup.c
> > +++ b/drivers/misc/mei/bus-fixup.c
> > @@ -406,3 +406,3 @@ static struct mei_fixup {
> >         MEI_FIXUP(MEI_UUID_WD, mei_wd),
> > -       MEI_FIXUP(MEI_UUID_MKHIF_FIX, mei_mkhi_fix),
> > +//     MEI_FIXUP(MEI_UUID_MKHIF_FIX, mei_mkhi_fix),
> >  };
> > 
> > 
> > I don't know what this may break, as the description of 7279b23 just
> > says:
> > "This workaround was added to support other broken OS and we need to
> > follow here."
> > 
> > Unless there is a better justification, I think the commit should be
> > reverted, for now.
> 
> Somebody else already created the bug 192051 in the Linux Kernel Bug Tracker
> [1].

There's a fix for this in my tree to go to Linus for 4.10-rc4.

thanks,

greg k-h