linux-kernel - Re: Crash caused by hid-rmi and no longer working touchscreen

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Message-ID: <20170410183802.GA39262@dtor-ws>
Date:   Mon, 10 Apr 2017 11:38:02 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Gabriele Mazzotta <gabriele.mzt@...il.com>, aduggan@...aptics.com,
        benjamin.tissoires@...hat.com,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-input@...r.kernel.org,
        Peter Hutterer <peter.hutterer@...-t.net>,
        Cameron Gutman <aicommander@...il.com>,
        Thorsten Leemhuis <linux@...mhuis.info>,
        Nick Dyer <nick@...anahar.org>,
        Christopher Heiny <cheiny@...aptics.com>
Subject: Re: Crash caused by hid-rmi and no longer working touchscreen

On Mon, Apr 10, 2017 at 03:18:03PM +0200, Jiri Kosina wrote:
> 
> [ a couple more people from "the other regression thread" added to CC ]
> 
> On Mon, 10 Apr 2017, Gabriele Mazzotta wrote:
> 
> > Hi,
> > 
> > I'm having troubles with hid-rmi using 4.11-rc6. I'm getting some
> > "rmi_hid_read_block: timeout elapsed" errors and ultimately the
> > crash you can see at the end of this mail. I will reply to this
> > mail with a full log that shows all the errors.
> > 
> > The problem seems to be caused by commit 279967a65b320d174a507498ae
> > ("HID: rmi: Handle all Synaptics touchpads using hid-rmi").
> > 
> > My laptop has a Synaptics touchpad and a Synaptics touchscreen.
> > Because of that commit, hid-rmi is used for both the devices, while
> > it has always been used only for the touchpad. Needless to say that
> > the touchscreen no longer works.
> > 
> > If I revert that commit, everything goes back to normal.
> 
> Alright, given this is a second regression cause by this switch, I suggest 
> to revert this one for 4.11 still, and work on fixing this properly for 
> 4.12.
> 
> If noone raises any objections (a few more people added to Cc), I'll queue 
> a 4.11-rc revert tomorrow.

Yes, we also have this:

	https://bugzilla.kernel.org/show_bug.cgi?id=195287

so reverting seems prudent at this time.

Thanks.

-- 
Dmitry