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.
Then again I tested the above with kernel 2.6.18. Here suspend to disk
works fine with bulk transfer in progress but system hangs when
isochronous transfer in progress.
Is the path for suspend to disk is still broken for some cases like
suspendind to disk while transfer is in progress ? Anyone please
suggest.
Thanks,
Rasmit.
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