On Sun, Dec 20, 2009 at 02:36:58PM +0100, Ruud Linders wrote: > > Hello, > > After upgrading to 2.6.32 I experienced strange behavior with a > usb-serial device. I have an application running to capture 433Mhz RF > transmissions using RF-receiver (from rfxcom.com) which has an built-in > serial-2-usb ftdi chip, connected to an older Dell laptop. After > programming the RF receive mode on startup of application, the device > will be sending messages (few bytes) whenever it receives some valid RF > data, nothing is transmitted anymore from the PC side. > > This has been running fine without problems for over a year, > occasionally upgrading to latest kernel, that's until I upgraded from > 2.6.31 to 2.6.32. > > I'm seeing that serial data seems to get buffered somehow, nothing is > received on the laptop for tens of minutes, even stranger is that moving > the (usb-)mouse seems to trigger something and all the "buffered" serial > data is suddenly received in a burst. That sounds like an interrupt issue, if you run 'usbmon' can you see the data coming in large chunks like this? > Problem gets worse when there are other activities going on and less > notable when the laptop is more or less idle. Wierd, again, it sounds like an interrupt thing, not a usb-specific thing. Care to file an acpi bug in bugzilla.kernel.org to work with them to get it resolved? thanks, 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
