TrackPoint and TouchPad unreliable on Lenovo T460

[jbmorley]

I've been seeing inconsistent TrackPoint and TouchPad behavior with my Lenovo T460; sometimes they work perfectly, sometimes I'm seeing what feels like incredibly low sample rates, and sometimes they don't work at all.

I seem to be seeing both the TrackPoint and TouchPad drop into the following three states, independent of each other, following booting:

• device doesn't work at all
• device seems to work but very unreliably and the cursor jumps with what feels like a sample rate of ~1s; this leads to some move events being missed entirely and leaves input almost unusable
• device works just fine!

The TrackPoint typically doesn't work and surprises me when it does. It probably works <10% of the time. The TouchPad seems to be more reliable, probably working 25% of the time on a fresh boot, and maybe 80% of the time after a warm restart (this makes me wonder if it's related to https://dev.haiku-os.org/ticket/14236). Feels a lot like we're not successfully initializing the hardware correctly.

I can imagine these might be completely different issues, but I thought I'd raise them together and we could split them out if necessary.

I'm pretty new to this reporting process with Haiku, so please let me know what information I can capture and what I can do to help.

[jbmorley]

I've added logs described in ​https://www.haiku-os.org/docs/welcome/en/bugreports.html. 'usb_hid_report' doesn't seem to be available on my path so that output is missing.

There are two sets of logs:

• '_working_touchpad_warm_report' logs from a warm reboot where the TouchPad is working but the TrackPoint is not working
• '_not_working' logs from a cold boot where neither the TouchPad or TrackPoint is working

[waddlesplash]

There are no USB HID reports because your TrackPoint and Touchpad are both PS/2.

The last boot in the "non-working" has these two lines (not next to each other, but in this order):

KERN: ps2: devfs_publish_device input/touchpad/ps2/synaptics_0, status = 0x00000000
KERN: ps2: devfs_publish_device input/keyboard/at/0, status = 0x00000000
KERN: ps2: devfs_publish_device input/mouse/ps2/ibm_trackpoint_0, status = 0x00000000
KERN: ps2: keyboard found

It seems odd that the TrackPoint isn't working on this boot but the touchpad is (even if in "low-resolution" state), I wonder what's the difference?

In the "working warm reboot" syslog, we have this:

KERN: ps2: devfs_publish_device input/touchpad/ps2/synaptics_0, status = 0x00000000
KERN: ps2: devfs_publish_device input/keyboard/at/0, status = 0x00000000
KERN: ps2: keyboard found
KERN: ps2_dev: reset failed: I/O error
KERN: ps2: devfs_publish_device input/mouse/ps2/synaptics_passthrough, status = 0xffffffff

I wonder what's different for us to get the "synaptics passthrough" device? Perhaps related to the trackpoint being missing?

[jbmorley]

Thanks for digging into this!

Just to clarify—the TrackPoint isn’t functioning in either of the boots I captured logs for. I’ll try to capture a log next time I see it working but it does so with a lower frequency than the TouchPad.

In case it’s relevant, I noticed yesterday that the TouchPad started working on its own accord some time into a cold boot (tens of minutes). That doesn’t happen consistently though.

Please let me know if there’s anything I can do to help diagnose or investigate further.

[waddlesplash]

Well, I'm not really an expert in our PS/2 stack, and I don't have any immediate plans to dig into it; I just wanted to take a first pass at triaging the issue. The information you've provided so far is certainly helpful, though.