linux-kernel - Re: Suspend on Lenovo 3000 V200

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Date:	Mon, 7 Apr 2008 10:44:29 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	nikosapi <me@...osapi.org>
Cc:	linux-acpi@...r.kernel.org, Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>
Subject: Re: Suspend on Lenovo 3000 V200 - Linux 2.6.25rc8

On Monday, 7 of April 2008, nikosapi wrote:
> On April 6, 2008 19:23:36 Rafael J. Wysocki wrote:
> > On Monday, 7 of April 2008, nikosapi wrote:
> > > On April 6, 2008 16:21:57 Rafael J. Wysocki wrote:
> > > > On Sunday, 6 of April 2008, Nick Nobody wrote:
> > > > > Hello,
> > > >
> > > > Hi,
> > > >
> > > > > I'm trying to get suspend working properly on my Lenovo 3000 V200.
> > > > > I'm using Linux 2.6.25rc8 and the latest xf86-video-intel. Before I
> > > > > was using kernel-2.6.23.15-137.fc8, xorg-x11-drv-i810-2.1.1-8.fc8 and
> > > > > suspend worked perfectly.
> > > > >
> > > > > The laptop will go to sleep properly but it doesn't seem to enjoy
> > > > > waking up. When it starts up it will either display a black screen
> > > > > and remain frozen or I will end up at a virtual term login prompt but
> > > > > when I put in my username it never prompts me for my password.
> > > > >
> > > > > The only way to get suspend working reasonably well is to first
> > > > > hibernate and then suspend. After a hibernation suspend seems to work
> > > > > fine :S
> > > > >
> > > > > I'm a real noob when it comes to figuring out these sort of things,
> > > > > so any pointers on things I could try would be much appreciated.
> > > > >
> > > > > Here's what s2ram has to say about my hardware:
> > > > > Machine is unknown.
> > > > > This machine can be identified by:
> > > > >     sys_vendor   = "LENOVO"
> > > > >     sys_product  = "07642CU"
> > > > >     sys_version  = "LENOVO3000 V200"
> > > > >     bios_version = "65ET32WW (1.06 )"
> > > > >
> > > > > Here's the output of dmidecode: http://pastebin.ca/973442
> > > >
> > > > Can you try to run "echo mem > /sys/power/state" instead of s2ram and
> > > > see if the symptoms are the same?
> > > >
> > > > Also, please try reverting commit
> > > > 7c0ea45be4f114d85ee35caeead8e1660699c46f (reproduced below for
> > > > conveninence) and see if that helps.
> > > >
> > > > Thanks,
> > > > Rafael
> > > >
> > > > ---
> > > > commit 7c0ea45be4f114d85ee35caeead8e1660699c46f
> > > > Author: Zhao Yakui <yakui.zhao@...el.com>
> > > > Date:   Tue Mar 11 16:56:47 2008 +0800
> > > >
> > > >     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>
> > > >
> > > > diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
> > > > index 12cce69..ace958c 100644
> > > > --- a/drivers/acpi/video.c
> > > > +++ b/drivers/acpi/video.c
> > > > @@ -713,7 +713,7 @@ static void acpi_video_device_find_cap(struct
> > > > acpi_video_device *device)
> > > >
> > > >  	kfree(obj);
> > > >
> > > > -	if (device->cap._BCL && device->cap._BCM && device->cap._BQC &&
> > > > max_level
> > > >
> > > > > 0){ +	if (device->cap._BCL && device->cap._BCM && max_level > 0) {
> > > >
> > > >  		int result;
> > > >  		static int count = 0;
> > > >  		char *name;
> > > > --
> > > > To unsubscribe from this list: send the line "unsubscribe linux-acpi"
> > > > in the body of a message to majordomo@...r.kernel.org
> > > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > >
> > > Hello Rafael,
> > >
> > > I tested with that patch and the problem persists, when the laptop
> > > resumes it locks up (with a black screen). If I add acpi_apic_instance=2
> > > acpi_osi=Linux as kernel boot options (as suggested by my dmesg) when it
> > > resumes I get back to a virtual term but I'm not able to log in. After
> > > entering my username it just hangs there.
> >
> > Can you please test if the 2.6.24.4 kernel works, then?
> >
> > Rafael
> > --
> 
> What a coincidence, I upgraded to kernel-2.6.24.4-64.fc8 this afternoon. 
> Suspend and hibernate work perfectly, even my wifi led works ;)
> 
> Could it be an error I made while configuring the 2.6.25rc8 kernel? Or maybe 
> some other software that needs to be upgraded?

Most probably, there's a regression in the kernel.

Since the issue seems to be 100% reproducible for you, could you please carry
out a bisection to find the commit that broke things for you?

Rafael
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