linux-kernel - Re: PROBLEM: USB keyboards works only 4 per PC host port

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Date:	Thu, 14 Aug 2008 18:49:48 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Aivils Stoss <aivils@...net.lv>, lud <linux-usb@...r.kernel.org>
Cc:	Samuel Thibault <samuel.thibault@...-lyon.org>,
	linux-input@...r.kernel.org, jkosina@...e.cz,
	linux-kernel@...r.kernel.org,
	linuxconsole-dev@...ts.sourceforge.net
Subject: Re: PROBLEM: USB keyboards works only 4 per PC host port

On Sun, 10 Aug 2008 04:08:37 +0100 Aivils Stoss wrote:

> On Saturday 09 August 2008 11:42:26 am Samuel Thibault wrote:
> > Aivils Stoss, le Fri 08 Aug 2008 07:02:24 +0100, a écrit :
> > > I suppose this is Linux kernel bug because i test keyboards under
> > > Windows, which support any schema of cascading of usb hubs.
> >
> > On the very same machine and hubs?
> 
> Yes, on same machine. Under Windows i don't have evdev interface,
> checked only how keypress go to console.
> Of course to repeat a try You must have at least 5 keyboards and
> 1 7-port or 2 4-port hubs and kernel 2.6.22 and above. I allways
> got result - 5th, 6th, 7th keyboard does not send events to console
> or evdev.


[adding linux-usb mailing list]

Hi,

I finally got 5 USB keyboards together along with 2 hubs.
I daisy-chained the hubs and connected 1 keyboard to the hub that is
on the notebook computer USB port, then I connected 4 keyboards to the
second hub.  They all worked for me, meaning that I can type on all of
them and have their characters show up on my console.

I'm testing with 2.6.7-rc2.
'usbtree' output of the USB subsystem is attached.


---
~Randy
Linux Plumbers Conference, 17-19 September 2008, Portland, Oregon USA
http://linuxplumbersconf.org/

View attachment "usb-kbds.txt" of type "text/plain" (1868 bytes)