On Fri, 5 Apr 2013, Paul Menzel wrote: > Dear Linux USB folks, > > > using Debian Wheezy/testing with Linux 3.2.39-2 and > uswsusp 1.0+20110509-3, I see the following problem similar to the one > described in some Ubuntu forum from 2009 [1] or a question from 2012 to > Ask Ubuntu [2]. > > Running `pm-hibernate` and `s2disk`, sometimes everything works, but > very often, it does not snapshot the system but just stalls. > > Looking for splash system... none > s2disk: Snapshotting system > > Comparing the loaded modules listed in `/var/log/pm-suspend.log`, it > turns out that the module `usb-storage` is the problem. Unloading this > before hibernating, by doing for example > > $ echo "MODULES_SUSPEND=usb-storage" >> /etc/pm/config.d/60-modules > > the problem cannot be reproduced anymore. > > I attach some more information at the end of the message. > > Do you know if such a problem was fixed in later Linux kernels? How > should that be debugged? You should start by running a later Linux kernel; that will answer your first question right away. For further testing, you should build the kernel with CONFIG_USB_DEBUGGING enabled and see what the dmesg log says following a failed attempt to hibernate. You may also want to try running usbmon (see Documentation/usb/usbmon.txt) during the hibernation attempt. It might provide some useful information. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
