Linux Symposium, July 13th - 17th, 2009, Montreal, Canada
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July 13-17, 2009

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What to do when suspend does not work on your box

Rafael J. Wysocki (rjw@sisk.pl)

Although suspend has generally been improving recently, there still is a number of machines on which it does not work at all or which require specific workarounds or kernel command line options to be set for it to work. Unfortunately, some of these workarounds and kernel command line options are not documented very well and it sometimes is difficult to find out which of them are necessary for given system. We will discuss the suspend-related kernel command line switches and user space workarounds that can be applied and show how to find a suitable workaround for given system, if there is any. I am also going to show how to narrow a suspend failure down to a specific subsystem or device driver and what to do to provide kernel developers with debugging information that will allow them to fix the problem. Finally, I am going to give some hints about getting help on debugging suspend issues.



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