On Thu, Jun 13, 2002, Bret Waldow <bwaldow@xxxxxxxxxxxxxx> wrote: > This problem has elements of USB, video, Handspring Visor, IBM Thinkpad, > maybe SuSE, and maybe kernel version. > > I have an IBM T21 Thinkpad with the IBM USB Ultracam. I am running SuSE > 7.3 (kernel 2.4.10). I am using the SuSE supplied kernel source, and I > copied ultracam.c from SuSE 2.4.16 kernel source, and applied Karl's > Ultracam patch. The only configuration change I made from SuSE supplied > was to add module support for the Ultracam. Make, modules, etc. all > goes fine, and I am running on the resulting kernel. > > With this, the Ultracam works fine. I added it to modules.conf (in > place of the bttv), and it works great. > > Now I turn my attention to my Handspring Visor Prism with the USB sync > cradle. It starts to sync, then fails partway through consistently. A > bit of hair pulling, reading, more hair, and I try an experiment - > instead of uhci.o, I load the usb-uhci.o module. Now the Visor syncs > without complaint, consistently. > > But loading the Ultracam driver locks the system hard. Only a power off > gets out of it (thanks for journaling files systems). > > Go back to uhci, Ultracam works, Visor fails partway through sync. > > It seems to me that there's some improper usage of the USB calls > somewhere, in visor or ultracam, or more likely somewhere in the USB > driver chain - uhci and usb-uhci are supposed to provide the same > services aren't they? The difference is supposed to be due to the > interface to the underlying hardware, yes? uhci and usb-uhci are just different implementations of the same exact hardware and API. > In any case, I don't have anywhere near enough knowledge of the > internals of the USB device support to know what to do where. I can > think of kludges to get around it - but I thinking there might be > something significant implemtation-wise someone want's to look at. > > Maybe I just need to use the 2.4.16 kernel. > > I'd be happy to supply more info, try experiments, learn more about the > systems. Please let me know. 2.4.10 is pretty old, but I suspect SuSE has applied atleast some USB patches. It's difficult to tell which ones they did apply. 2.4.19-pre10 has the best drivers for both uhci and usb-uhci. I know that a problem with syncing Visor's with uhci was fixed a while ago, but that may have been after 7.3 was released. I would atleast try to find a newer SuSE kernel and try that. JE
