linux-kernel - Re: [PATCH 4.1 026/159] Input: synaptics - fix handling of disabling gesture mode

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Message-ID: <20150929125356.GA9452@kroah.com>
Date:	Tue, 29 Sep 2015 14:53:56 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Josh Boyer <jwboyer@...oraproject.org>
Cc:	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	Nick Bowler <nbowler@...conx.ca>,
	Gabor Balla <gaborwho@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Benjamin Tissoires <btissoir@...hat.com>
Subject: Re: [PATCH 4.1 026/159] Input: synaptics - fix handling of disabling
 gesture mode

On Tue, Sep 29, 2015 at 08:27:14AM -0400, Josh Boyer wrote:
> On Sat, Sep 26, 2015 at 4:54 PM, Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> > 4.1-stable review patch.  If anyone has any objections, please let me know.
> >
> > ------------------
> >
> > From: Dmitry Torokhov <dmitry.torokhov@...il.com>
> >
> > commit e51e38494a8ecc18650efb0c840600637891de2c upstream.
> >
> > Bit 2 of the mode byte has dual meaning: it can disable reporting of
> > gestures when touchpad works in Relative mode or normal Absolute mode,
> > or it can enable so called Extended W-Mode when touchpad uses enhanced
> > Absolute mode (W-mode). The extended W-Mode confuses our driver and
> > causes missing button presses on some Thinkpads (x250, T450s), so let's
> > make sure we do not enable it.
> >
> > Also, according to the spec W mode "... bit is defined only in Absolute
> > mode on pads whose capExtended capability bit is set. In Relative mode and
> > in TouchPads without this capability, the bit is reserved and should be
> > left at 0.", so let's make sure we respect this requirement as well.
> >
> > Reported-by: Nick Bowler <nbowler@...conx.ca>
> > Suggested-by: Gabor Balla <gaborwho@...il.com>
> > Tested-by: Gabor Balla <gaborwho@...il.com>
> > Tested-by: Nick Bowler <nbowler@...conx.ca>
> > Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> I believe Dmitry is going to revert this commit very shortly.  See
> 
> http://www.spinics.net/lists/linux-input/msg41176.html
> 
> You might want to leave this one out of both 4.2.y and 4.1.1y.

I prefer to wait for stuff like this to hit Linus's tree to keep in
sync, bugs at all at times.

thanks,

greg k-h
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