linux-kernel - Re: Suspend on Lenovo 3000 V200

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Date:	Sun, 6 Apr 2008 22:21:57 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Nick Nobody" <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 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;
--
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