From: mahesh <mahesh_chelen@yahoo.com>
To: linux-kernel@vger.kernel.org
Subject: Re: PROBLEM: PS/2 keyboard does not work with 2.6.15
Date: Sat, 4 Feb 2006 07:01:47 +0000 (UTC) [thread overview]
Message-ID: <loom.20060204T075631-490@post.gmane.org> (raw)
In-Reply-To: d120d5000601090954k3e35c3c7n31d4d6796ac760bf@mail.gmail.com
Dmitry Torokhov <dmitry.torokhov <at> gmail.com> writes:
On 1/9/06, Alan Stern <stern <at> rowland.harvard.edu> wrote:
> On Mon, 9 Jan 2006, Dmitry Torokhov wrote:
>
> > > It would be nice to know which part of the usb-handoff code causes the
> > > problem.
> >
> > Well, it's not handoff code causing problems per se, it's just that it
> > does not look like it performs handoff. If it did then disabling USB
> > legacy emulation in BIOS would have no effect, right?
>
> On the other hand, if the BIOS worked correctly then the ps/2 port would
> have no problems regardless of whether USB legacy emulation was on or off.
> Given that the keyboard works during bootup, I see only two possibilities:
>
> The USB handoff code somehow causes the BIOS to mess up the
> state of the 8042;
>
> The 8042 driver interacts badly with the firmware when USB
> legacy emulation is on, and the USB handoff code doesn't
> successfully turn off legacy emulation.
>
> My earlier suggestion was an attempt to test the first possibility. The
> second is harder to test because it implies problems in both the 8042
> driver and the USB handoff code.
>
My experience is that USB legacy emulation in BIOS + ACPI works as
long as you do not touch it and gets terribly confused if someone
tries to actually use i8042 (like enable active multiplexing mode with
4 AUX ports). As soon as BIOS takes its dirty hands off i8042
everything works fine.
The problem it seems that when usb-handoff code was moved from pci
quirks and enabled inconditionally something happened so it stopped
doing handoff.
Dmitry
hi
I experienced same problem, but after complilng latest kernel the problem is
rectified. So I think problem with kernel 2.6.11,13 ..could be rectified by
compiling with a higher version of kernel.
regd
mahesh
next prev parent reply other threads:[~2006-02-04 11:30 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-05 13:58 PROBLEM: PS/2 keyboard does not work with 2.6.15 Martin Bretschneider
2006-01-05 14:37 ` Dmitry Torokhov
2006-01-06 7:21 ` Jan Engelhardt
2006-01-06 16:29 ` Martin Bretschneider
2006-01-06 19:00 ` Jesper Juhl
2006-01-08 21:23 ` Martin Bretschneider
2006-01-08 22:19 ` Dmitry Torokhov
2006-01-09 9:50 ` Martin Bretschneider
2006-01-09 6:26 ` Dmitry Torokhov
2006-01-09 15:32 ` Alan Stern
2006-01-09 16:50 ` Dmitry Torokhov
2006-01-09 17:23 ` Alan Stern
2006-01-09 17:54 ` Dmitry Torokhov
2006-01-09 20:08 ` Martin Bretschneider
2006-02-04 7:01 ` mahesh [this message]
2006-01-10 7:43 ` Vojtech Pavlik
2006-01-10 15:12 ` Alan Stern
2006-01-10 15:28 ` Vojtech Pavlik
2006-01-10 15:37 ` Dmitry Torokhov
2006-01-11 0:01 ` Jan Rekorajski
2006-01-11 0:19 ` Pete Zaitcev
2006-01-11 15:26 ` Alan Stern
2006-01-11 16:01 ` Jan Rekorajski
2006-01-11 19:57 ` Pete Zaitcev
[not found] ` <161717d50601101019k34a901a8x37fb28187a609490@mail.gmail.com>
[not found] ` <d120d5000601101225h32b44f7eobae654056cf0318c@mail.gmail.com>
[not found] ` <161717d50601101419q373cde76y6b374f1ae289ca22@mail.gmail.com>
[not found] ` <d120d5000601101425g576f8fd3kc9de80a4b320c3bf@mail.gmail.com>
2006-01-11 2:45 ` Dave Neuer
2006-01-09 18:36 ` Martin Bretschneider
2006-01-09 19:09 ` Alan Stern
2006-01-09 6:10 Leonid
2006-01-14 14:20 Walt H
2006-01-14 17:09 ` Alan Stern
2006-01-14 19:27 ` Walt H
2006-01-15 15:45 ` Alan Stern
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