Bug#605275: EeePC 1005HAG still freezes when probing the builtin 3G modem
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
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