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authorAlan Stern <stern@rowland.harvard.edu>2007-05-04 11:52:20 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2007-07-12 16:29:47 -0700
commit0458d5b4c9cc4ca0f62625d0144ddc4b4bc97a3c (patch)
tree8b1fcb4f063ef4aa6f2e3cd41a60d986a1e432d4 /Documentation/power
parentce7cd137fced114d49178b73d468b82096a107fb (diff)
USB: add USB-Persist facility
This patch (as886) adds the controversial USB-persist facility, allowing USB devices to persist across a power loss during system suspend. The facility is controlled by a new Kconfig option (with appropriate warnings about the potential dangers); when the option is off the behavior will remain the same as it is now. But when the option is on, people will be able to use suspend-to-disk and keep their USB filesystems intact -- something particularly valuable for small machines where the root filesystem is on a USB device! Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation/power')
-rw-r--r--Documentation/power/swsusp.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt
index 5b8d6953f05..152b510d1bb 100644
--- a/Documentation/power/swsusp.txt
+++ b/Documentation/power/swsusp.txt
@@ -393,6 +393,9 @@ safest thing is to unmount all filesystems on removable media (such USB,
Firewire, CompactFlash, MMC, external SATA, or even IDE hotplug bays)
before suspending; then remount them after resuming.
+There is a work-around for this problem. For more information, see
+Documentation/usb/persist.txt.
+
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
suspend to disk (and resume) is much slower on 2.6.16 compared to