On Tue, Mar 12, 2024 at 09:57:06AM +0100, Jan Čermák wrote: > Hi Alan > > On 11. 03. 24 15:43, Alan Stern wrote: > > Well, at least this means you do have a way of using the device, even > > if it is rather awkward. It might even work on the Raspberry Pi machine. > > Still, I'm looking for a more permanent and robust solution. If it were only > a single device I'm using myself, I could come up with a workaround. > However, this is one of the very few available Z-Wave USB interfaces and > there are more users affected. So far we went with reverting the patches, > but that's surely not the way we want to go forward. I agree, this should be fixed if we can. I'm still puzzled about how commits you located could cause any difference in the device's behavior, given that they don't seem to cause any change's to the computer's behavior. > > The device is so non-responsive, I'm amazed it ever works at all. > > Judging by the usbmon traces, it doesn't look as if it would work on a > > Windows system. > > > > Actually, if you have access to a computer running Windows or Mac OSX > > and you can try out the device on that computer, it would be good to > > get the equivalent of a usbmon trace (something like a Wireshark > > capture log would do). If those systems manage to do something that > > Linux doesn't, we ought to know what it is. > > Fredrik (one of the original reporters) is following this conversation, here > [1] are logs from his machine with some details in the ticket [2]. He also > wonders why the initialization doesn't work only on USB2 ports but works on > USB3 if the initialization code is shared between those two. Good. I've been quite busy recently, but I'll look at the logs when there is time. The USB-2 and USB-3 drivers do share some initialization code, but not all of it. The first couple of steps are quite different: With a USB-2 controller they are handled by the kernel driver, but with a USB-3 controller they are handled directly by the controller's hardware with no software influence. Alan Stern > Also, if needed, I can get more logs from the X220 I was using for my usbmon > traces - I believe I have an HDD with Windows 7 install lying somewhere. > > Regards, > Jan > > > [1] https://github.com/home-assistant/operating-system/files/14563813/usbPcap1_USB2-port.txt > [2] https://github.com/home-assistant/operating-system/issues/2995#issuecomment-1989329739
