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Date: Thu, 15 May 2008 12:33:15 -0400 From: Bill Nottingham <notting@...hat.com> To: linux-kernel@...r.kernel.org Subject: Problems with suspend and USB storage I've been testing suspend/hibernate with various USB devices under 2.6.25.2. Test box is a Thinkpad T60 (uhci, ehci). The results are somewhat dismal. Using USB as a hibernate device: - A directly connected USB stick works OK as a hibernate device - A directly connected USB hard drive works OK as a hibernate device - A USB stick connected via an ExpressCard reader does not - it appears to just not be there when the hibernate code attemps to write the data. On resume (from either hibernate or suspend from RAM): - Any 'in use' USB storage, whether it be as swap (a hibernate device), or a mounted filesystem, immediately generates errors on resume. It appears the filesystem and/or swap tasks are woken up before the actual USB device - it enumerates the disks after the errors have already been thrown. - As a consequence, the USB devices shift their device names - Using USB_PERSIST has no effect on this problem - This appears to happen for all USB connection types (hard drive, stick, via ExpressCard reader.) Is there any way to get sane behavior out of suspend/resume with USB storage? Bill -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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