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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 19:29:47 -0400
commit0458d5b4c9cc4ca0f62625d0144ddc4b4bc97a3c (patch)
tree8b1fcb4f063ef4aa6f2e3cd41a60d986a1e432d4 /Documentation/power/swsusp.txt
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>
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diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt
index 5b8d6953f05e..152b510d1bbb 100644
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+++ b/Documentation/power/swsusp.txt
@@ -393,6 +393,9 @@ safest thing is to unmount all filesystems on removable media (such USB,
393Firewire, CompactFlash, MMC, external SATA, or even IDE hotplug bays) 393Firewire, CompactFlash, MMC, external SATA, or even IDE hotplug bays)
394before suspending; then remount them after resuming. 394before suspending; then remount them after resuming.
395 395
396There is a work-around for this problem. For more information, see
397Documentation/usb/persist.txt.
398
396Q: I upgraded the kernel from 2.6.15 to 2.6.16. Both kernels were 399Q: I upgraded the kernel from 2.6.15 to 2.6.16. Both kernels were
397compiled with the similar configuration files. Anyway I found that 400compiled with the similar configuration files. Anyway I found that
398suspend to disk (and resume) is much slower on 2.6.16 compared to 401suspend to disk (and resume) is much slower on 2.6.16 compared to