Re: USB problems in 2.2.14pre9

Tom Rini [off-list ref] Wrote:

On Fri, 21 Jan 2000, Stephen Edie wrote:

quoted

Oh yes, I am using a USB keyboard right now.  It seems to happen whenever
more than three keys are simultaneously down...  When the fourth key is
pressed, it isn't reported.  At this point, releasing any of the four keys
causes duplicated key strokes to be reported.  Strange.

Using a more current stack (2.3.40) I can use up to 6 keys (ie press 'em
one after another and the last pressed one works) and the 7th is ignored.

I reported this several months ago. It has affected all kernels with the
new USB driver (post 2.2.6). I believe it is a side effect of the
USB-ADB translation. In effect you only get 2-key rollover instead of
n-key rollover. Haven't seen that since the 70's :)

It will be interesting to see if the 2.3.40 kernel works better. Judging
by Tom's comment, it looks like it's now 6-key rollover ;)

It's REAL easy to get the bad behavior by typing cd<space>
I ALWAYS get cdcd with this sequence. (note that the c and d keys aren't
released before the space is hit). It appears I'm not the ONLY one who types
like this....

Bob
--
Robert E. Brose II    N0QBJ
http://www.jriver.com/~bob/
bob@kunk.jriver.com

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bob@kunk.jriver.com wrote:

It will be interesting to see if the 2.3.40 kernel works better. Judging
by Tom's comment, it looks like it's now 6-key rollover ;)

It's REAL easy to get the bad behavior by typing cd<space>
I ALWAYS get cdcd with this sequence. (note that the c and d keys aren't
released before the space is hit). It appears I'm not the ONLY one who types
like this....

I type cd like that too....I get the cdcd or the cdc a lot too....you're not
alone!! :-)

--Nelson Abramson

--
"Every time you get a dialog box you don't understand, you ought to get a nickel
 from Microsoft, and every time it crashes, you should get a dollar.  That would
 make Bill Gates homeless and me a rich man." --Ben Schneiderman, University of
Maryland computer science professor
Courtesy of 1984: http://www.1984-online.com/facts.html


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