> Given that sort of issue, switching cables could matter too. Not > all "old" cables are evidently capable of handling high speed > signals.
That as actually one of the first things I tried when I encountered the problems. I tried 5 diffent cables, all marked with "USB 2.0 compatible". 4 of them produced nearly the same kind and level of resets/disconnects. One was really bad and produced a lot more erros. I've thrown it into the trashcan as soon as I found out. > You can tell NEC 0.95 vs 1.0 by the part number, as I recall. 720100 being > a 0.95 part, and I don't have a 1.0 version. The 0.95 is pretty solid > under Linux. Just found out that we have a Adaptec-brand controller using a EHCI 1.0 NEC chip in one of the servers at work: kernel: ehci_hcd 0000:00:0e.2: EHCI Host Controller kernel: ehci_hcd 0000:00:0e.2: irq 5, pci mem 0xdffffe00 kernel: ehci_hcd 0000:00:0e.2: new USB bus registered, assigned bus number 1 kernel: ehci_hcd 0000:00:0e.2: USB 2.0 initialized, EHCI 1.00, driver 26 Oct 2004 00:0e.2 USB Controller: NEC Corporation USB 2.0 (rev 04) (prog-if 20 [EHCI]) Subsystem: Adaptec: Unknown device 091e Flags: bus master, medium devsel, latency 64, IRQ 5 Memory at dffffe00 (32-bit, non-prefetchable) [size=256] Capabilities: [40] Power Management version 2 The website of our dealer says it has a NEC D720100AS1 chip on it. But I doubt that since NEC says 720100 is EHCI 0.95 and 720101 is EHCI 1.0 (http://www.necel.com/usb/en/index.html). Is the output of the linux ehci driver reliable or can the vendor easily fake that? I'll take a look at the chip itself tomorrow... It is more expensive (40 euros) compared to the via/ali boards I tried (about 10 euros). I have no problems paying more if I pay for a good board/chip and not just for the brandname... Probably I'm going to mail order one of those controllers (my local dealer doesn't have them). And another thing: we don't have any problems with backup to a usb-ide on this server at work, even with a genesys usb-ide chip... Kind regards, Gerd ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel