Re: problem in swsusp with usb-serial convertor attached

[Greg KH <greg@kroah.com>]

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On Fri, Jan 20, 2006 at 12:30:36PM +0530, rasmit.ranjan@wipro.com wrote:
> hi,
>     In my system Linux-2.6.13.3 swsusp works properly.

Have you tried 2.6.15?  And enabled CONFIG_USB_SUSPEND?

> Now one usb-serial convertor device is attached to my system. I manually
> loaded the driver for the device and attached the device to my system.At
> this stage swsusp works properly. But my device is not in use. So resume
> works properly.
> Now i opened minicom terminal for ttyUSB0 and ttyS0 ( now my device is
> in use ) and suspend my system. My system got suspended but did not get
> resumed and showed the follwing messages on screen.
>  
> usb 1-1: USB disconnect,address 4
> usb 1-1: usb_disable_device nuking all URBs
> usb 1-1: unregistering interface 1-1:1.0
> rasmit 1-1:1.0 device disconnected
> usb 1-1:1.0 : hot plug
>  
> My device was connected to 1-1:1.0
> The driver for usb-serial convertor does not have suspend/resume
> functions.

Which usb-serial driver are you using for this device?

> Is it happening because of the driver does not handle suspend/resume or
> for any other reason ?

None of the usb-serial drivers handle suspend/resume natively, they rely
on the usb core to do a disconnect and reconnect, which will probably
cause your terminal to be disconnected, like you see.

So, I guess everything is working properly :)

thanks,

greg k-h

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