Thinkpad t480s elantech touchpad device is not recognized: unknown touchpad firmware (firmware v.0x7f3001)

Wed May 29 17:17:26 UTC 2019

Hi Andrey,

I don't know much about drivers but I would suggest reposting to X11 
list since it's as much related to drivers as it's to the GUI (and 
freebsd-drivers doesn't seem to be very active).

GrzegorzJ

On 16/05/2019 22:40, Andrey Kosachenko wrote:
> Hi,
>
> Recently I've replaced my t410 with t480s model.
> Before ordering the device I found positive feedback in terms of 
> FreeBSD compatibility (pages like 
> https://wiki.freebsd.org/Laptops/Thinkpad_T480)
>
> Apparently device is equipped with newer clickpad+trackpoint device 
> which is not recognized by 12R properly:
>
> FreeBSD beastie.intra 12.0-RELEASE-p3 FreeBSD 12.0-RELEASE-p3 #2 
> r347114M: Sun May 12 00:08:31 EEST 2019 
> root at beastie.intra:/usr/obj/usr/src/amd64.amd64/sys/BEASTIE-EVDEV amd64
>
> Attempts to enable hw.psm.synaptics_support or(and) 
> hw.psm.elantech_support didn't help either. Though  trackpoint works 
> just fine after enabling hw.psm.trackpoint_support
>
> instead touchpad is recognized as generic PS/2 mouse (relevant strings 
> from dmesg)
>
> ===
> May 11 22:39:41 beastie kernel: atkbd0: [GIANT-LOCKED]
> May 11 22:39:41 beastie kernel:   Unknown touchpad hardware (firmware 
> v.0x7f3001)
> May 11 22:39:41 beastie kernel: psm0: <PS/2 Mouse> irq 12 on atkbdc0
> May 11 22:39:41 beastie kernel: psm0: [GIANT-LOCKED]
> May 11 22:39:41 beastie kernel: psm0: model Generic PS/2 mouse, device 
> ID 0
> ===
>
> I was pretty much happy working with the device in general and with 
> the tuouchpad in particular (as a simple mouse). Even got accustomed 
> to the absence of double-finger scroll capability (which I could 
> simulate via holding mid-button+swipe on touchpad) and 
> triple-finger-tap as a midle-button-click). The only thing that I 
> failed to workaround was accidental palm touches which is really 
> painful and makes keyboard usage unbearable. Eventually I tried to 
> seek for normal solution.
>
> Lenovo site sujests for t480s devices "ELAN UltraNav Driver for 
> Windows 10 64-bit - ThinkPad T480s (Type 20L7, 20L8)" driver. Which 
> made me think it is elantech (not synaptics). Looking through the psm 
> sources quickly led me to the point where a very simple modification 
> and recompilation of the kernel helped to recognize touchpad properly. 
> In particular:
>
> ===
> [silent at beastie][/usr/src]svnlite diff sys/dev/atkbdc/psm.c
> Index: sys/dev/atkbdc/psm.c
> ===================================================================
> --- sys/dev/atkbdc/psm.c        (revision 347114)
> +++ sys/dev/atkbdc/psm.c        (working copy)
> @@ -6929,7 +6929,7 @@
>  {
>         static const int ic2hw[] =
>         /*IC: 0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f */
> -           { 0, 0, 2, 0, 2, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0 };
> +           { 0, 0, 2, 0, 2, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 };
>         static const int fw_sizes[][3] = {
>                 /* FW.vers  MaxX  MaxY */
>                 { 0x020030, 1152,  768 },
> ===
>
> I.e. after that simple modification system started to recognize fw 
> version:
>
> ===
> [silent at beastie][/usr/src]dmesg | egrep psm
> psm0: <PS/2 Mouse> irq 12 on atkbdc0
> psm0: [GIANT-LOCKED]
> psm0: model Elantech Touchpad, device ID 0
> ===
>
> and all expected touchpad features (multi-tap gestures and scrolling, 
> whatsoever) started to function properly under xorg+evdev. I'm happy 
> with a touchpad now however trackpoint stopped to work. In particular 
> attempt to use trackpoint causes strange flickering of the mice cursor 
> (which lasts few fractions of the second) after which cursor jumps to 
> the left-upper corner of the screen and it's impossible to move it 
> (via trackpoint) anymore (though swiping touchpad surface moves cursor 
> as expected). Also I found in Xorg.log messages emerging when a palm 
> touches the surface of a touchpad:
>
> ===
> [    65.729] (EE) event3  - ETPS/2 Elantech Touchpad: kernel bug: 
> Touch jump detected and discarded.
> See 
> https://wayland.freedesktop.org/libinput/doc/1.12.6/touchpad-jumping-cursors.html 
> for details
>
> ===
>
>
> Additionally I found relevant topic in openbsd lists 
> http://openbsd-archive.7691.n7.nabble.com/ThinkPad-T480s-Elantech-v4-clickpad-configuration-td342242.html. 
> Eventually I narrow down it to the following changes: 
> https://github.com/openbsd/src/commit/8e9e9c10431cb45d93e2c0d81f668ff9575f8015#diff-ff06b79b08490ebbfa34b15aa4ebf370 
> . I might be inherently wrong (due to lack of knowledge in C language 
> and driver implementation) however it seemed to me that the similar 
> logic the diff above reveals (besides fw detection) had already been 
> added to psm.c from FreeBSD sources earlier.
>
>
> So I'm writing here for 2 purposes:
>
> 1) not sure that my modification is proper in terms of firmware 
> version detection (so can't send patch since there is a high chance it 
> will be rejected)
>
> 2) modification is definitely either incomplete or incorrect since it 
> brakes trackpoint functioning.
>
> Since I possess a laptop with a device which is not supported yet, I 
> might help to debug the issue or even dedicate some time and try to 
> add support for a new device (just need a nudge into proper direction)
>
> Thanks in advance!
>
> -- 
> WBR,
> Andrey Kosachenko
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