Re: Dell Latitude E7470 touchpad status

[Ben Gamari <ben@smart-cactus.org>]

[-- Attachment #1: Type: text/plain, Size: 1813 bytes --]

Pali Rohár <pali.rohar@gmail.com> writes:

> On Wednesday 25 May 2016 12:38:15 Allen_Hung@Dell.com wrote:
>> 
>> I got responds from Alps and they confirmed that the Alps devices in
>> Dell systems are speaking in protocol V8. The devices that speak in
>> protocol V9 are using different ASIC hardware and they are not used
>> in Dell systems..
>> 

Thanks Allen!

>
> Hi Allen, thank you for confirmation.
>
> Ben, V8 protocol is supported by linux kernel since version 4.1. Do you
> have needed version?

Yes, I have been running 4.5 and 4.6.

> If yes and your touchpad does not work, please compile psmouse.ko in
> debug mode and send us dmesg output. Maybe there can be something
> interesting...
>
As I mentioned earlier, the device is certainly not recognized as an
ALPS device,

     [  367.097253] input: ImPS/2 BYD TouchPad as /devices/platform/i8042/serio1/input/input21

If I `rmmod psmouse; modprobe psmouse dyndbg==pm` I find this,

    [  714.520655] psmouse: psmouse serio1: cypress_ps2: send extension cmd 0x00, [0 0 0 0]
    [  714.748482] psmouse: psmouse serio1: cypress_ps2: Command 0x00 response data (0x): 00 00 14
    [  714.781858] psmouse: psmouse serio1: alps: E6 report: 00 00 64
    [  714.804749] psmouse: psmouse serio1: alps: E7 report: 73 03 28
    [  714.830829] psmouse: psmouse serio1: alps: EC report: 73 01 13
    [  714.833568] psmouse: psmouse serio1: alps: Likely not an ALPS touchpad: E7=73 03 28, EC=73 01 13
    [  714.860923] psmouse: psmouse serio1: elantech: unexpected magic knock result 0x00, 0x02, 0x64.
    [  714.947527] psmouse: psmouse serio1: byd: BYD touchpad detected
    [  715.869113] input: ImPS/2 BYD TouchPad as /devices/platform/i8042/serio1/input/input24

This seems like quite a hint.

Cheers,

- Ben

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 472 bytes --]