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

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Message-ID: <alpine.LNX.1.10.0808191721560.18058@jikos.suse.cz>
Date:	Tue, 19 Aug 2008 17:23:07 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Randy Dunlap <rdunlap@...otime.net>
cc:	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, 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.

-- 
Jiri Kosina
SUSE Labs
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