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SubjectRe: 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.


commit 7c0ea45be4f114d85ee35caeead8e1660699c46f
tree 0822ef23606a733e00bbf75d3e218b1e92abdd78
parent 2f44bbb495dd3e6d0209eff2257438ab9c570e5b
author Zhao Yakui <> Tue, 11 Mar 2008 16:56:47
committer Len Brown <> Tue, 11 Mar 2008 22:20:19

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
the optional object. So the _BQC object is ignored when the
backlight device
is registered in ACPI video driver.

Signed-off-by: Zhao Yakui <>
Signed-off-by: Zhang Rui <>
Signed-off-by: Len Brown <>

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
(cesky, pictures)
pomozte zachranit klanovicky les:

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