Hi Ulrik, On Thu, Mar 19, 2015 at 11:05:46PM +0100, ulrik.debie-os@xxxxxxxxx wrote: > Hi all, > > I looked at the bugzilla bugreport on > https://bugzilla.kernel.org/show_bug.cgi?id=84491 > "Elantech touchpad does not work on Asus TransformerBook Flip 500" > > There are problems reported on two variants: > Asus TransformerBook Flip TP500LN > Asus TP500LN > > George (in CC:) helped me to investigate on his hardware what happened > by trying a few patches and reporting what happens. > > It seems that the absolute mode setting somehow gets cancelled after the > elantech drivers initializes. This results in relative motion packets > coming in, elantech driver not recognizing them and consequentially > "lost sync at byte 6" messages. > > When one, after the psmouse driver is loaded, does the following: > echo 1 > /sys/devices/platform/i8042/serio4/reg_07 > ,the touchpad will work like a charm until suspend2ram. After a > suspend2ram, another echo is required. > > This exact same value is written during initialization of v4 hardware. > As a test, I even read it back in elantech_set_absolute_mode after > writing and at that moment in the driver the value 1 is read. > > But when one performs the read later on the commandline of reg_07, value > 0 is read, so probably for a reason unknown to me, the value goes to > 0 because of some timeout or serio communiation. > > I also tried putting elantech_set_input_params call in front of > elantech_set_absolute_mode, but that didn't help either. > > Also the suspend2ram seems to result in the same thing. > > Anyone an idea why this reg_07 1 value could become a 0 between the time > the function elantech_set_absolute_mode during loading of the psmouse > module and the time when reading the value from sysfs from the > command line ? Hmm, so after Elantech code has done with the init you see the correct value in r7? Psmouse driver does [re]set scale, rate and resolution after protocol has been initialized, maybe that confuses Elantech in the same fashion as it does Focaltech? Thanks. -- Dmitry -- 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
