linux-kernel - Re: Linux 3.7-rc3

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Date:	Fri, 02 Nov 2012 22:40:25 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	David Airlie <airlied@...ux.ie>
Subject: Re: Linux 3.7-rc3

On Friday, November 02, 2012 10:07:10 PM Daniel Vetter wrote:
> On Fri, Nov 2, 2012 at 9:25 PM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
> > On Mon, Oct 29, 2012 at 5:10 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> >>
> >> Unfortunately, s2disk is broken with this one and previous -rc.  In the
> >> majority of cases it just hangs the machine during hibernation, although
> >> sometimes it returns to user space reporting freezing problems, suspicions
> >> RCU usage and similar stuff, pretty much without any useful debug information.
> >
> > Ugh. I was hoping that we'd get more reports on this, right now
> > there's not enough information to even make a guess about what's up.
> >
> > I also note that no actual i915 people were cc'd, despite your
> > graphics driver suspect. Adding Daniel and Dave (one of the millions)
> > to the cc since they probably do have lkml but probably don't react
> > unless something gets pointed out.
> >
> > Daniel/Dave, do you have any reports of hibernation failing (or VT
> > switching problems) with i915 after 3.6?
> 
> Not that I've heard of. We did though rewrite the entire modeset
> sequence driving code in i915 for 3.7, removing massive amounts of
> hacks and stupid "let's disable/enable things harder" code simply
> because the old code couldn't keep track of the hw state well enough.
> So I wouldn't be surprised at all if that unearthed a hidden bug
> somewhere, but we've also added ridiculous amounts of self-checks. And
> thus far they caught all issues due to that rework (and some ancient
> bugs on top) when either the i915 driver or the bios did something
> nefarious ...
> 
> I've rechecked the git log and otherwise there's nothing else which
> pops up that would fit VT-switching/hibernate going bad but the
> modeset rework.

Can you point me to a range of commits worth checking?

Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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