linux-kernel - Re: 2.6.21-rc1: known regressions (part 2)

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Date:	Tue, 27 Feb 2007 11:59:22 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Pavel Machek <pavel@....cz>, Adrian Bunk <bunk@...sta.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Michael S. Tsirkin" <mst@...lanox.co.il>,
	Thomas Gleixner <tglx@...utronix.de>, linux-pm@...ts.osdl.org,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	Daniel Walker <dwalker@...sta.com>
Subject: Re: 2.6.21-rc1: known regressions (part 2)

On Tue, Feb 27 2007, Ingo Molnar wrote:
> 
> * Jens Axboe <jens.axboe@...cle.com> wrote:
> 
> > > > x60 doesn't resume from S2R either, it doesn't matter if 
> > > > CONFIG_NO_HZ is set or not though. 2.6.20 worked fine.
> > > 
> > > It somehow works for me. As long as I do not play with bluetooth and 
> > > suspend to disk...
> > 
> > It locks solid here on resume, going back to 2.6.20 makes it work 
> > perfectly again. In between 2.6.20 and 2.6.21-rc1 some ACPI change 
> > broke resume, but that got fixed. Some other change later snuck in 
> > that broke it AGAIN for me, sigh.
> > 
> > I don't use bluetooth nor suspend to disk.
> 
> resume is stock on my T60 too. So you mean v2.6.21-rc1 vanilla works 
> fine? Do you know a commit ID that works for sure? I'd like to bisect 

Nope, 2.6.21-rc1 vanilla does not work. 2.6.20 works. 2.6.20-gitX worked
until some acpi change broke it, the below patch fixed that for me. That
got merged in a later 2.6.20-gitY, but then some other patch broke it
again so that 2.6.21-rc1 is broken. Not much luck there :-)

So it looks like:

- c5a7156959e89b32260ad6072bbf5077bcdfbeee broke 2.6.20-git
- f3ccb06f3b8e0cf42b579db21f3ca7f17fcc3f38 should fix that.
- Something later than f3ccb06f3b8e0cf42b579db21f3ca7f17fcc3f38 broke it
  again.

> this, but this way i might just find that ACPI change that got already 
> fixed later on (and then got re-broken).

Yeah, it gets trickier. I'll try
f3ccb06f3b8e0cf42b579db21f3ca7f17fcc3f38 now and see if that works, then
bisect to 2.6.21-rc1 to find the other offender. I hope the other
offender didn't get added before
f3ccb06f3b8e0cf42b579db21f3ca7f17fcc3f38, we'll see :-)

-- 
Jens Axboe

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