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

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Message-ID: <20080318230538.GA1686@elf.ucw.cz>
Date:	Wed, 19 Mar 2008 00:05:38 +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)

Hi!

> > 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...?

No, this commit was not responsible, but CONFIG_ACPI_VIDEO *is*
responsible for the "X has no backlight after lid close/open".
								Pavel
-- 
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