We too are having long term problems with a spontaneous USB
disconnect hanging khubd. The only way to fix is a reboot. The
hardware is VIA EPIA 1GHz Nehemiah running a stock 2.6.14.3 kernel
with latest 117 test VIA bios. It's not a specific USB driver problem
as is occurs with various USB devices (pen drive, FX2, etc). All are
ehci devices. It's not power, connector, cable or grounding related.
The disconnects only happen running Linux, running Win2K or WinXP
never sees a spontaneous disconnect. The problem also takes from 4 to
36 hours to occur. This is the important part of trying to reproduce
the disconnect, you must leave the ehci device connected for a long
time, sometimes for up to two days. System load does not matter. The
issue is that same with all versions of kernels that we have tried up
to the current 2.6.14.3.
I'm looking for help in discovering why the disconnect happens and
possible solutions. We can do the grunt work here, I'm just looking
for pointers from the Linux USB experts on where look and what to
start looking for.
From what I gather in praying to google over the last six months,
many VIA chipset Linux users are seeing hints of this problem. We
have some systems that never disconnect (rare), some that disconnect
quickly (also rare), some that take much longer (the rest). All the
systems are have identical hardware, identical software.
Thanks
Scott
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