Re: [PATCH] Input: psmouse - disable automatic probing of BYD touchpads

On Sat, Nov 12, 2016 at 11:39 AM, Pali Rohár [off-list ref] wrote:

On Saturday 12 November 2016 20:15:45 Dmitry Torokhov wrote:

quoted

BYD automatic protocol detection is extremely unreliable and is often
triggers false positives on regular mice, Sentelic touchpads, and
other devices. BYD has several documents that have recommended
detection sequence, but they conflict with each other and, as far as
I can see, still would not produce unique enough output to reliably
differentiate BYD from other PS/2 devices.

OEMs sourcing BYD devices also do not do us any favors by not
supplying any reasonable DMI data and instead leaving turds like "To
Be Filled By O.E.M." in place of vendor data, or "System Serial
Number" as serial number.

...

quoted

      echo -n "byd" > /sys/bus/serio/devices/serio1/drvctl

I agree, if we cannot detect BYD devices correctly without breaking
other non-BYD devices then detection must be done by user...

So you can add my Reviewed-by: Pali Rohár to this patch.

Anyway, BYD show Linux as supported OS for their devices. It is really
rude from BYD that they show Linux as supported OS, but Linux driver is
reverse-engineered by community and they do not want to cooperate and at
least provide some useful documentation for detection...

I am not even sure they have a good way of detecting their devices.
The Windows model is that vendor supplies OEM with their driver and it
just works (I do not think these devices have external PS/2 ports so
there is no concern with mis-detection).

Thanks.

-- 
Dmitry