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

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Date:	Tue, 19 Aug 2008 13:55:58 -0400
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Randy Dunlap <rdunlap@...otime.net>,
	Aivils Stoss <aivils@...net.lv>, stern@...land.harvard.edu,
	lud <linux-usb@...r.kernel.org>,
	Samuel Thibault <samuel.thibault@...-lyon.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	linuxconsole-dev@...ts.sourceforge.net
Subject: Re: PROBLEM: USB keyboards works only 4 per PC host port

On Tue, Aug 19, 2008 at 05:23:07PM +0200, Jiri Kosina wrote:
> On Tue, 19 Aug 2008, Randy Dunlap wrote:
> 
> > > 2.6.22-1-mepis-smp
> > > Quite stable. Have oops sometime inside evdev. Support up to 16 
> > > USB keyboards, where 4 hubs are plugged into PC and 4 keyboards on
> > > each hub. Any hub cascade support only 4 keyboards, where 5th or more
> > > is registered but don't send input events. Oops inside evdev , when
> > > USB keyboard unplugged. No slow down even all USB keyboards does
> > > not work properly. My be this one support more than 16 keyboards, but
> > > i don't have PC USB ports enough.
> > Has the evdev oops been reported and/or fixed? I think that we would 
> > prefer to fix that soonish.
> 
> We haven't seen the respective oops yet, or have I missed it?
> 
> I'd bet it is fixed in newer kernels by patches that introduce proper 
> locking into evdev code.
> 

If evdev (or any other part of the input sybsystem) still oopses in
2.6.26 and 2.6.27 I would like to see that oops very much.

-- 
Dmitry
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