lkml.org 
[lkml]   [2008]   [May]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectProblems 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


\
 
 \ /
  Last update: 2008-05-15 18:35    [W:0.058 / U:0.052 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site