Hello, I like to report and may be help to resolve this problem, it is not 100% sure where the bug is, but it causes a crash of the basic Linux USB stack (with out any vendor specific module loaded!) -- I am the developer of the SignalRanger-MK2 based modules (see links below). The vendor claims the Product MK2 is officially USB-2.0 certified. Also strange is, the bug/crash only seam to happen on AMD based systems -- see below for a list. Also I found this behavior not new and happening for quiet some time -- not really kernel version dependent at all. What I found (without any of my own kernel modules/driver even loaded) -- the basic USB (2.0) base layer of Linux crashes as the point of USB unregistering (unplug) of the MK2. If it crashes, it's badly, at times a instant reboot happens or it is kind of stuck/totally frozen with need of hardware reset. I never found any (for me) use full information in the kernel logs. This strangely happens only on some PC hardware (chips sets/mainboards) -- may be a USB chipset bug/issue -- I found in particular this happens ** Randomly (about 1 out of 3 unplugs) on my office workstation -- a Quad AMD Opteron, 64 bit Linux ** Consistently at every unplug on my home computer -- a AMD X4-Phenom, 64 bit Linux, Gigabyte MA790GP-UD4H ** Luckily never happened on three of our Core-Duo Intel based machines we use at the Lab for data aqcisition, 64-bit Linux :-) ** Also my Thinkpad T61 never crashed (Intel) Looks like some how AMD system are effected only. Now, the newest device "MK3-Pro" dose NOT generate this issue on my home machine (X4-Phenom) at all any longer :-) As far as I can tell. I just now tested several plugin-in /-out cycles -- all fine! I am in good close contact with the company SoftdB making these SignalRanger boards and we are interested in resolving this issue -- they would be willing to provide a board for testing -- only I have no clue where to start and whom to contact -- that is why I write this report here. Please advice what can be done. Further Informations: http://sranger.sourceforge.net/ (Kernel modules) http://gxsm.sourceforge.net/ (Software using it) USB Device vendor: http://www.softdb.com/ (go to DSP Division) best regards -Percy ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Dr. Percy Zahl Center for Functional Nanomaterials WWW:http://www.cfn.bnl.gov Brookhaven National Laboratory ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Please avoid sending me Word or PowerPoint attachments. Seehttp://www.gnu.org/philosophy/no-word-attachments.html Find my public pgp key here:http://keyserver2.pgp.com/ .^. /V\ //G\\ Visit Gxsm now! Unlimited and free SPM+ software: /(XSM)\ -----> http://gxsm.sf.net <------ ^^-^^ -- 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
