Hi! > I have a PCMCIA card hosting a USB port. I am facing some > problems while trying to suspend my laptop to disk . Given below are > some of my observations: > > 1. With kernel 2.6.15.4, my system does not get suspended to disk with > the PCMCIA card plugged in. I went through the mailing list and found a > mail thread desribing the same. > http://lists.infradead.org/pipermail/linux-pcmcia/2006-January/003123.ht > ml > > This seems to be the breakage in resume path and not fixed in 2.6.15.4. > So the final thing is, I have to remove my PCMCIA card before trying to > suspend my system to disk. > > 2. With the kernel 2.6.16.28, the above breakage seems to be fixed. So I > tried suspending my system to disk with my PCMCIA card plugged in but > without any device connected to the USB port of the PCMCIA card. This > works fine. My system responds fine, suspends to disk properly and > resumes back as well. > > 3. Now I try a step ahead and tried suspending the system to disk with > the PCMCIA card plugged in as well as a USB speaker/webcam connected to > the USB port of PCMCIA card. This also works fine. My system is > suspended and resumed properly. > > 4. Now again going a step ahead. I plugged in my PCMCIA card, then I > connected a USB speaker to the USB port of the card and started playing > a song. Now I suspended the system to disk while the transfer was in > progress( song was being played). But this time my system hangs. This > happens with other isochronous devices like webcam and bulk device like > USB key as well. So suspend to disk fails if any USB transfer is in > progress ( through the USB port of my PCMCIA card). > > I tried debugging the problem and used kdb to find out the reason. For > all the devices I found out the following thing : > > The system hangs in following path: usb_disconnect --> > usb_disable_device --> put_device. > After put_device the system hangs. As I was in kdb mode I could not save > the stack trace. > > Is it a known kernel problem with 2.6.16.28 ? Please suggest. Reproduce it with 2.6.18, then it is bugzilla time, or post to linux-usb mailing list. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
