On Tue, 12 Oct 2010, Florian Echtler wrote: > Hello everyone, > > I've just installed Ubuntu 10.10 (64bit) with a 2.6.35 kernel on my > Lenovo T410s. This laptop has a N-Trig DuoSense digitizer which works > fine with hid_ntrig, however, as soon as this driver is loaded or was > loaded previously, suspend stops working. > > When the driver is loaded, the laptop immediately wakes up again after > the suspend attempt. When the driver has been unloaded, the laptop > suspends properly, but hangs on wakeup. > > dmesg shows: > > usbhid 2-1.8:1.1: suspend error -5 > pm_op(): usb_dev_suspend+0x0/0x20 returns -5 > PM: Device 2-1.8 failed to suspend async: error -5 > PM: Some devices failed to suspend > > The bug has already been reported to kernel bugzilla [1], however, there > hasn't been any recent activity. I'd like to help pin this bug down, it's > the only annoyance in an otherwise flawlessly working machine. Therefore, > I'd be glad for some starting points as to how to debug this. It would be good to start by finding out where the -EIO error comes from. One likely candidate is where drivers/hid/usbhid/hid-core.c:hid_suspend() calls usbhid_wait_io(). Is that the source of the error? Does the wait_event_timeout() call actually time out? Since the posted dmesg log was made without CONFIG_PRINTK_TIME, we can't see if there really was a 10-second delay. Or does the error come from the hid->driver->suspend() call instead? 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
