linux-kernel - Re: suspend slow in 2.6.25-rc6 (was Re: Suspend and hibernation patchset against -rc6)

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Date:	Tue, 18 Mar 2008 23:52:03 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	David Brownell <david-b@...bell.net>, Greg KH <greg@...ah.com>,
	Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Shaohua Li <shaohua.li@...el.com>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	Johannes Berg <johannes@...solutions.net>
Subject: Re: suspend slow in 2.6.25-rc6 (was Re: Suspend and hibernation
	patchset against -rc6)

On Tue 2008-03-18 10:31:28, Linus Torvalds wrote:
> 
> 
> On Tue, 18 Mar 2008, Pavel Machek wrote:
> >
> > On Tue 2008-03-18 14:06:42, Pavel Machek wrote:
> > > 
> > > Confirmed, suspend slowness is in 2.6.25-rc6, too. It takes 15 seconds
> > > to suspend/resume, while 2.6.24 takes 9. Thinkpad x60.
> > 
> > IIRC 2.6.25-rc5 was "fast".
> 
> Can you bisect it? There's only 343 commits between -rc5 and -rc6,
> so it 

It will take a while. My .git directory is 7G, and I'd like to do a
backup before playing with git.

git gc does not exist here, so I guess I need to update git, too :-(.

> should not take too long to check which commit it is. Even if it should 
> take 9 reboots to bisect it entirely, going just five or six will likely 
> narrow it down sufficiently that we can probably guess fairly well what 
> it's about.

Hmm, it gets weirder. 2.6.25-rc5 was fast, and had small problem with
backlight hotkeys did not work.

2.6.25-rc6 has backlight hotkeys somehow working, but closing/opening lid in X
kills the backlight, making machine unusable.

Hmm...

commit 7c0ea45be4f114d85ee35caeead8e1660699c46f
tree 0822ef23606a733e00bbf75d3e218b1e92abdd78
parent 2f44bbb495dd3e6d0209eff2257438ab9c570e5b
author Zhao Yakui <yakui.zhao@...el.com> Tue, 11 Mar 2008 16:56:47
+0800
committer Len Brown <len.brown@...el.com> Tue, 11 Mar 2008 22:20:19
-0400

    ACPI: Ignore _BQC object when registering backlight device

    According to acpi spec , the objects of  _BCL and _BCM are
required if
    integrated LCD is present and supports brightness level .The _BQC
is
    the optional object. So the _BQC object is ignored when the
backlight device
    is registered in ACPI video driver.

    http://bugzilla.kernel.org/show_bug.cgi?id=10206

    Signed-off-by: Zhao Yakui <yakui.zhao@...el.com>
    Signed-off-by: Zhang Rui  <rui.zhang@...el.com>
    Signed-off-by: Len Brown <len.brown@...el.com>


when did this go in? Pretty recently, right? And that means that ACPI
backlight driver is now used on machines where it was not used
before...?
								Pavel
-- 
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