linux-kernel - Re: 2.6.35 suspend regression (bisected)

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Message-Id: <201007272103.38448.rjw@sisk.pl>
Date:	Tue, 27 Jul 2010 21:03:38 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Roberto Oppedisano <roberto.oppedisano@...il.com>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.35 suspend regression (bisected)

On Tuesday, July 27, 2010, Roberto Oppedisano wrote:
>   On 26/07/2010 00:35, Sam Ravnborg wrote:
> > On Mon, Jul 26, 2010 at 12:18:14AM +0200, Rafael J. Wysocki wrote:
> >> On Sunday, July 25, 2010, Roberto Oppedisano wrote:
> >>> My HP6730B (x86_64 kernel, uptodate lubuntu Lucid installed) fails to suspend
> >>> on recent git kernels, the screen goes black (backlight on) and stays there forever.
> >>>
> >>> Here's what I found from a bisect.
> >>>
> >> Does it work if you revert that commit?
> > Roberto wrote:
> >
> >>> Alas reverting that single commit on current linux/master does not
> >>> solve the issue so it could be that I did something wrong... anyway
> >>> here the log of the bisect:
> > So I guess not...
> [resending due to lklm reject... gmail defaults to html email, sorry for 
> duplicate emails]
> 
> I did bisect again and I did get a different result:
> 
> c1518f12bab97a6d409a25aaccb02dc8895800f3 is the first bad commit
> 
> git bisect start
> # good: [e40152ee1e1c7a63f4777791863215e3faa37a86] Linus 2.6.34
> git bisect good e40152ee1e1c7a63f4777791863215e3faa37a86
> # bad: [1a041a23da7c77b53c71fe11b4f940388bee37b1] Merge branch 
> 'x86-fixes-for-linus' of 
> git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
> git bisect bad 1a041a23da7c77b53c71fe11b4f940388bee37b1
> # good: [7f02ab3ce3c7e093c414fcbd93bdc591cc4419d0] Merge 
> git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6
> git bisect gdinf ood 7f02ab3ce3c7e093c414fcbd93bdc591cc4419d0
> # good: [7839ec78214ecf477cc9e2862233b8d9fcf4ec58] gpiolib: document 
> that names can contain printk format specifiers
> git bisect good 7839ec78214ecf477cc9e2862233b8d9fcf4ec58
> # bad: [e620d1e39aa33b43bed96aa7f2ebbc88914aed58] Merge branch 
> 'v4l_for_2.6.35' of 
> git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6
> git bisect bad e620d1e39aa33b43bed96aa7f2ebbc88914aed58
> # good: [021fad8b706849c091f6e682bc5df3ce4f9ab4d7] Merge branch 
> 'x86-fixes-for-linus' of 
> git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
> git bisect good 021fad8b706849c091f6e682bc5df3ce4f9ab4d7
> # good: [d4376802999d478a103868d7e7b1f473e4a387af] Merge branch 
> 'fix/asoc' into for-linus
> git bisect good d4376802999d478a103868d7e7b1f473e4a387af
> # good: [d7940b04fa441b06b69f05faef43c5fb2156ab72] Merge 
> git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6
> git bisect good d7940b04fa441b06b69f05faef43c5fb2156ab72
> # good: [5c331fc8c19e181bffab46e9d18e1637cdc47170] V4L/DVB: dvb-core: 
> Fix ULE decapsulation bug
> git bisect good 5c331fc8c19e181bffab46e9d18e1637cdc47170
> # good: [a094c0afc3515aaf962dd0793f3b23fe67e6b192] Merge 
> git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6
> git bisect good a094c0afc3515aaf962dd0793f3b23fe67e6b192
> # good: [2a0ab2cd73c26835e635ed4e3868f983519048fb] drbd: Reduce verbosity
> git bisect good 2a0ab2cd73c26835e635ed4e3868f983519048fb
> # good: [1abec4fdbb142e3ccb6ce99832fae42129134a96] block: make 
> blk_init_free_list and elevator_init idempotent
> git bisect good 1abec4fdbb142e3ccb6ce99832fae42129134a96
> # good: [bd62307b20ff864c48541e46c3ee2bb9cc330f64] V4L/DVB: ivtv: Avoid 
> accidental video standard change
> git bisect good bd62307b20ff864c48541e46c3ee2bb9cc330f64
> # bad: [c1518f12bab97a6d409a25aaccb02dc8895800f3] Merge branch 
> 'rc-fixes' of 
> git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6
> git bisect bad c1518f12bab97a6d409a25aaccb02dc8895800f3
> # good: [cbab05f041a4cff6ca15856bdd35238b282b64eb] gconfig: fix build 
> failure on fedora 13
> git bisect good cbab05f041a4cff6ca15856bdd35238b282b64eb
> 
> Trying to revert that commit gives:
> 
> $ git bisect reset
> $ git revert c1518f12bab97a6d409a25aaccb02dc8895800f3
> fatal: Commit c1518f12bab97a6d409a25aaccb02dc8895800f3 is a merge but no 
> -m option was given.
> 
> How am I supposed to proceed now ? (sorry I'm a git newbie)

The bisect turned up a merge, which means it probably didn't really converge
for you.

Do you use a camera driver?

Rafael
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