linux-kernel - Re: Lenovo X240 (haswell) suspend-to-ram hangs on 3-14.0-rc2

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Date:	Fri, 14 Feb 2014 21:46:25 +0800
From:	Jeff Chua <jeff.chua.linux@...il.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Peter Hurley <peter@...leysoftware.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Dave Airlie <airlied@...hat.com>
Subject: Re: Lenovo X240 (haswell) suspend-to-ram hangs on 3-14.0-rc2

On Fri, Feb 14, 2014 at 1:28 AM, Takashi Iwai <tiwai@...e.de> wrote:
> At Thu, 13 Feb 2014 12:14:58 -0500,  Peter Hurley wrote:
> Apparently there's no maintainer but I've cc'ed people who might
> have a clue about this.

Peter ... thanks for pointer.

> On Fri, Feb 14, 2014 at 1:28 AM, Takashi Iwai <tiwai@...e.de> wrote:
> Is it a Intel+Nvidia hybrid?  If so, does it happen even with
> CONFIG_VGA_SWITCHEROO=n?

It's not Intel+Nvidia. It's Intel Core i7-4600U 2.1 GHz, Intel HD Graphics 4400.

I checked my config. CONFIG_VGA_SWITCHEROO is not set.

On Fri, Feb 14, 2014 at 5:21 AM, Theodore Ts'o <tytso@....edu> wrote:
> For what it's worth, I have a the X240's bigger brother --- a T540p
> (with intel graphics and the 3k panel) running 3.14-rc2, and
> suspend-to-ram is working without any problems on my laptop.

Interesting. Perhaps it's the USB options. I had these set to "y"

CONFIG_USB_XHCI_HCD=y
CONFIG_USB_EHCI_HCD=y
CONFIG_USB_EHCI_ROOT_HUB_TT=y
CONFIG_USB_EHCI_TT_NEWSCHED=y
CONFIG_USB_EHCI_PCI=y

Again, These same config works find on X230. It's very strange. The
same hard disk (SSD) can suspend-to-ram on the X230 but not on the
X240. The X230 has i7-3520M vs X240 i7-4600U.

I've even tried with all the USB set to "n" and still couldn't S2D.
May be the graphic?

Thanks,
Jeff
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