lkml.org 
[lkml]   [2018]   [Apr]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Sony Vaio VGN-CS31S touch sensor buttons breaking touchpad
On Mon, Apr 02, 2018 at 10:39:59PM +0200, Ondrej Zary wrote:
> On Sunday 01 April 2018 23:21:55 Ondrej Zary wrote:
> > Hello,
> > I got a Sony Vaio VGN-CS31S laptop with Synaptics touchpad that exhibits
> > weird behavior. It seems to work until I touch the "Touch Sensor Buttons"
> > bar above the keyboard - then the buttons start to act weirdly: click or
> > remain pressed (sometimes it breaks even without touching the bar).
> >
> > It seems to be a known problem with VGN-CS series:
> > https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-synaptics/+bug
> >/774877 https://wiki.freegeekvancouver.org/article/Laptop_Troubleshooting
> > (mentions nasty partial workaround: psmouse.resetafter=1)
> >
> > Many models of the VGN-CS series have the Touch Sensor Buttons:
> > ftp://124.40.41.224/PUB/MANUALS/SWT/Z009/Z009690111.PDF
> >
> > From the hardware side (can be found in MBX-196 Quanta GD2 schematic), the
> > touch bar is a separate PS/2 device connected to third PS/2 port of the EC
> > (Embedded Controller) WPC775L. The touchpad is on the 1st PS/2 port, 2nd
> > port is unused. However, the i8042 does not seem to support multiplexing,
> > the firmware probably combines the data internally somehow.
>
> Good news: it supports multiplexing but i8042_nomux is set because of:
> /*
> * Most (all?) VAIOs do not have external PS/2 ports nor
> * they implement active multiplexing properly, and
> * MUX discovery usually messes up keyboard/touchpad.
> */
> .matches = {
> DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
> DMI_MATCH(DMI_BOARD_NAME, "VAIO"),
> },
> in drivers/input/serio/i8042-x86ia64io.h
> (How can this be modified to exclude VGN-CS series?)

I guess we'd need a whitelist for MUXes, because older VAIOs would
behave really really badly when one tried to probe for active
multiplexing...

If you enable MUX, does it survive suspend/resume?

Thanks.

--
Dmitry

\
 
 \ /
  Last update: 2018-04-02 23:06    [W:0.064 / U:1.412 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site