From mboxrd@z Thu Jan 1 00:00:00 1970 From: Uwe Geuder Subject: [PATCH] PM / hibernate/resume: clarify documentation Date: Mon, 29 Jun 2015 23:35:05 +0300 Message-ID: <87lhf2p81y.fsf@e6510-131.site> References: <87pp4gq0bl.fsf@e6510-131.site> <87mvzip8gz.fsf@e6510-131.site> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from gw03.mail.saunalahti.fi ([195.197.172.111]:38933 "EHLO gw03.mail.saunalahti.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753490AbbF2UfM (ORCPT ); Mon, 29 Jun 2015 16:35:12 -0400 In-Reply-To: <87mvzip8gz.fsf@e6510-131.site> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: "Rafael J. Wysocki" , Len Brown , Pavel Machek , linux-pm@vger.kernel.org it was not the whole truth that kernel mode cannot be used with swap on LVM Signed-off-by: Uwe Geuder --- Documentation/power/swsusp.txt | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt index f732a83..8cc17ca 100644 --- a/Documentation/power/swsusp.txt +++ b/Documentation/power/swsusp.txt @@ -410,8 +410,17 @@ Documentation/usb/persist.txt. Q: Can I suspend-to-disk using a swap partition under LVM? -A: No. You can suspend successfully, but you'll not be able to -resume. uswsusp should be able to work with LVM. See suspend.sf.net. +A: Yes and No. You can suspend successfully, but the kernel will not be able +to resume on its own. You need an initramfs that can recognize the resume +situation, activate the logical volume containing the swap volume (but not +touch any filesystems!), and eventually call + +echo -n "$major:$minor" > /sys/power/resume + +where $major and $minor are the respective major and minor device numbers of +the swap volume. + +uswsusp works with LVM, too. See http://suspend.sourceforge.net/ Q: I upgraded the kernel from 2.6.15 to 2.6.16. Both kernels were compiled with the similar configuration files. Anyway I found that -- 1.8.4.5