On Monday 02 April 2018 23:05:29 Dmitry Torokhov wrote: > 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? Yes, suspends and resumes fine. (Suspend takes 20-25 seconds after the HDD stops but it's the same regardless of MUX.) -- Ondrej Zary -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
