Alan Stern wrote:
Have you seen this patch?
http://marc.theaimsgroup.com/?l=linux-usb-devel&m=112439094723976&w=2
This started quite a bit of extracurricular activity (I installed the
patch and enumeration started in 2.6.12.3; previously it would _never_
get that far). This led Alan to ask me to set CONFIG_USB_DEBUG=y, which
I had unset due to odd behavior when previously trying various kernel
parameters.
At that point I decided to update the kernel again to 2.6.12.5, which
turns out to have caused some confusion.
My first unpatched run with 2.6.12.5 led to two enumeration failures,
so I set about partially applying a newer version of the patch as
requested by Dave Brownell. Enumeration worked erratically with various
values, and I started to get suspicious. So I backed out the patch and
tried 2.6.12.5 all on its lonesome a few more times, and sure enough,
it would enumerate.
More pissed or embarrassed? Hard to say.
Whatever changed between .3 and .5 got it to that state, and adding
lines from the patch made little if any difference.
I should have tested the raw kernel more thoroughly, but as luck would
have it my first tries were complete failures. Now I rarely see
complete failure.
So I have no idea if the patch is useful, at least as regards the
problem I'm seeing.
I did try various other USB2 devices on the port in question, and all
failed, including one another Linux user swears is very reliable.
I do have dmesg output from insertion of the device (16K), an attempt
to mount (16K) and unplugging after failure (another 16K). I also have
the output from /var/log/debug from that session (~540 lines in 62K).
If there is a good reason to post them, I will. If anyone just wants
the files forwarded, please let me know.
My sincere apology for the haphazard testing of 2.6.12.5 giving the
impression the patch (rather than the kernel) was getting through
enumeration. However, the good news is, it _is_ getting through
enumeration most times now.
Still, nothing USB2 mounts on that port unless I use 2.4.x, in which
case anything will.
As always, let me know if I can screw up anything else in a helpful
way...
Dave North
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