On Thu, Jun 21, 2007 at 11:45:36AM -0400, Alan Stern wrote: > On Thu, 21 Jun 2007, Mattia Dongili wrote: > > > > The log shows suspicious behavior on the part of the Sony UMH-U09 > > > device, the first one in your ehci-only list above. When it was > > > suspended it apparently disconnected itself from the USB bus, thereby > > > triggering a wakeup signal. If at all possible, try unplugging the USB > > > cable to that device and then see what happens when you suspend. > > > > wow, spotted! > > > > This device is an express card (SD/MMC reader). Do you have any > > suggestion to make suspend work without any workarounds? > > You mean, do I have any suggestion about how to make the card reader > behave properly? No. That needs more than a software change... :-) ok than we are on the broken HW case... > > I mean, all of this started by enabling wakeup on the ehci controller > > USB1 S3 disabled pci:0000:00:1d.0 > > USB2 S3 disabled pci:0000:00:1d.1 > > USB3 S3 disabled pci:0000:00:1d.2 > > USB4 S3 disabled pci:0000:00:1d.3 > > USB7 S3 enabled pci:0000:00:1d.7 > > > > and this was triggered when trying to understand if enabling wakeup by > > default on PCI devices was good or not (and the patch itself was > > responsible or not for problems). > > So, from my POV it's either not good or there has to be some way of > > dealing with disconnecting devices on suspend. > > There _is_ a way: Disable wakeup on that USB controller. > > > Just to simplify, in this situation, if I had an usb mouse attached to > > this usb controller and removed the mouse while suspended, would the > > laptop wakeup? > > If the USB controller was enabled for wakeup and was working correctly, > it would wake up the laptop. USB wakeup events are defined as: new > connection, disconnection, overcurrent, plus any wakeup requests > received from devices on the USB bus. > > > If so that's not what I most probably want. :) > > Maybe we should change the kernel so that the default wakeup setting > for USB controllers is disabled. Then people would have to enable > wakeup explicitly if they wanted to be able to start up their system by > typing on a USB keyboard, for instance. Don't know, I guess this could be easy automated in userspace actually. But if connect/disconnect are wakeup events my vote goes to default to disabled for usb controllers and manage selective enable with some nice userspace tool. Not that my opinion counts that much :) > > > You also ought to be able to prevent this immediate resume by disabling > > > wakeup on the EHCI controller. For example: > > > > > > echo disable >/sys/bus/usb/devices/usb5/power/wakeup > > > echo disable >/sys/bus/usb/devices/usb5/../power/wakeup > > > > that doesn't seem to work very well (on -rc5 at least): > > $ echo disable > /sys/bus/usb/devices/usb2/power/wakeup > > echo: write error: invalid argument > > > > The only value that seems to be accepted is 0 but reading the value > > gives always "enabled". > > Whoops, yes, it should be "disabled" instead of "disable". And of > course you have to use the correct USB bus number in the path -- I > wrote usb5 because that was the bus number of the EHCI controller in > your log. yes, sorry. That device is usb2 with uhci and becomes usb5 with ehci loaded. -- mattia :wq! _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
