Well, well, now I'm responding to myself ....
I think I tracked down the source of all this pain. It is the USB Controller: Intel Corp. 82371SB PIIX3 USB [Natoma/Triton II] (rev 01). I searched SpeedTouch mailing list for this one and found a few messages from people having problems with this host controller (I must have been blind I did not discovered them earlier). One of them (http://www.mail-archive.com/[EMAIL PROTECTED]/msg03622.html) even says a line about 0xFF sequences.
There seems to be a workaround in userspace driver by adding delay into read procedure though it affects the connection speed. Haven't tested it yet.
So now the question stands: Is there any way to get this buggy host controller work under Linux? I suppose that easiest thing to do would be to buy a new USB card. But I don't like this solution much because Windows can harness the controller without problems. Does anyone knows what causes problems with this specific controller in Linux?
Best regards,
Andrej
Andrej Kristofic wrote:
Hi.
I experience quite weird behaviour when trying to use SpeedTouch USB ADSL modem.
I'm able to establish connection and everything is going fine. But after some time
(not periodically) the connection locks up. Further investigation showed that packets
leave machine without problems but responses are not received. I'm able to reproduce
this "locked up" state by downloading test file stuffed with 0xFF bytes. This is weird
because when I try to download file containing 0x00 everything is fine. It seems that
certain combination of received bits (or bytes ?) causes the connection to lock up.
I tried both available drivers for modem (userland and kernel one) with same results.
As far as I can tell, this is not hardware problem - I'm able to use the modem under
Win98SE without problem.
In the end of mail I post the log of USB communication. I can't see any errors there, it looks like that
data are simply not received neither by modem driver nor the usb HCI driver.
Any ideas where the problem can be ? I'm fighting this for quite a long time but still losing.
My configuration:
HW:
Pentium 133Mhz, 64MB RAM,
motherboard with Intel 82430VX chipset,
USB Controller: Intel Corp. 82371SB PIIX3 USB [Natoma/Triton II] (rev 01)
Alcatel Speedtouch USB DSL modem
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