| title: | Re USB gt Serial gt Modem 2 4 vs 2 6 Ke |
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On Tuesday 16 November 2004 11:55am, Jed S. Baer wrote:
On Tue, 16 Nov 2004 02:24:34 -0400 Marr wrote:
On Monday 15 November 2004 04:56pm, Jed S. Baer wrote:
Also, by using an approprate level of squinting and other
enhancements, I have detected the "send data" LED flickering
oh-so-faintly when I hit[RETURN] in minicom, so it appears that data
is indeed going up to my ISP(and this is why I prefer external modems
-- das blinkenlights are still useful). Im beginning to think this is
not a USB problem. But that leaves me wondering what to look at next.
Jed,
I was preparing a response to your earlier email when I saw this. It
seems to me that my reply wont be pertinent unless/until you determine
if this is really a USB problem or not.
Im guessing that your machine has no RS-232 port or youd have tried
the simple test of eliminating the Belkin F5U103 USB/RS-232 adapter.
Short of borrowing a plug-in RS-232 card and/or some Linux-compatible
USB modem, or trying some other distro with 2.6.9 (or above), Im
without ideas. :^(
Well, I have 4 things needing serial ports. USB is the bane of my
existence. : But support for legacy hardware on the part of mobo
manufacturers is fast going away. My current mobo has only one serial
port, and at the very least I need to have my modem and UPS connected --
its tough, but Im doing without the X10 control dongle :). Also, all the
PCI slots are full -- there are only 3 of them, so adding a serial card or
internal modem isnt possible.
At this point, I dont know what to try next. Its tough to point fingers
at pppd or chat, because it works fine with ttyS0. It might be that either
of those programs is doing something with the tty settings that makes
usbserial or belkin_sa go haywire.
So it sounds like youve already tried disconnecting the UPS and hooking the
modem up to the RS-232 serial port for some short-term testing, right?
Those 2 modules werent getting loaded in your earlier report, so I assumed
that they were built into the kernel. You might want to build a kernel with
those 2 things as modules, then you could turn on debugging for those modules
as you unsuccessfully had tried earlier. Armed with that info, you might be
better equipped to pose a question on Linux-USB-Devel.
Maybe a line analyzer would provide
some clues, except that if I could afford one of those, Id just buy a new
mobo with more capacity.
Im hesitant to put the UPS on the USB/Serial adapter, until I feel better
about it being a reliable interface.
I dont know what sort of UPS youre using, but Ive successfully (on a
short-term basis) used my APC Back-UPS Pro 650 UPS with both my Belkin
F5U109 and my IOGear GUC232A USB/RS-232 adapters. See the apcupsd project
( www.apcupsd.com www.apcupsd.com ) for details. The manual (PDF and online HTML) was
recently updated by the maintainer, in part because of some of my brief
additions about this topic.
The last-ditch "solution" is to buy a USB external modem. The vast
majority of those are software modems. The controller modems are about
twice the price. Regrettably, I need to avoid spending any money I dont
have to.
Basically, I have evidence, now, which conflicts as to whether this is a
USB problem. But Im at a point where I dont know what to try next. If
there really is a bug somewhere in the USB toolchain, Id like to find it,
rather than just shrug and try something else.
I feel your pain. :^) Its very possible that the belkin_sa module is the
culprit, but Im somewhat surprised to know that it worked well in 2.4.18 and
not in 2.6.9. Sorry that I cannot be of more help here. :^(
Bill Marr
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