On Sun, Feb 26, 2012 at 05:38:46PM +0100, Maik Zumstrull wrote: > Hi there, > > this is a re-report because not everyone loves Bugzilla. > > tl;dr: Because of a conflict on a TTY lock, opening the builtin USB 3G > modem of the EeePC 1005HAG takes up to 10s. > > Previously reported as: > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=605275 > https://bugzilla.kernel.org/show_bug.cgi?id=23962 > > On all tested Debian kernel images from around 2.6.36 all the way to > 3.2.6, this netbook freezes for several seconds four times after > booting or returning from standby. The trigger has shown to be > ModemManager probing the builtin GSM/UMTS modem. The underlying issue > can be triggered without ModemManager with a minimal C program that > opens the device the same way ModemManager does (included in Bugzilla > report). The most problematic call is: > open("/dev/ttyUSB1", O_RDWR | O_EXCL | O_NOCTTY | O_NONBLOCK); > > The lsusb output for the affected device is: I don't see any long delay in your kernel log messages. What exactly is stalling so long? Is the device stuck doing something? If you enable debugging for usb and/or the driver, what does the kernel log show? What driver is bound to this device, the option one? greg k-h -- 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
