Synaptics Touchpad not working and not detected

Hmmm… can you try running sudo rmmod i2c_i801 ; sudo modprobe i2c_i801 and see what you get in dmesg -w (on the system where the touchpad does not work)?

[  474.793614] i801_smbus 0000:00:1f.4: SPD Write Disable is set
[  474.793722] i801_smbus 0000:00:1f.4: SMBus using PCI interrupt
[  474.793956] iTCO_wdt: Found a Intel PCH TCO device (Version=6, TCOBASE=0x0400)
[  474.794417] iTCO_wdt: initialized. heartbeat=30 sec (nowayout=0)
[  474.797718] i2c i2c-2: 2/2 memory slots populated (from DMI)
[  474.999296] i801_smbus 0000:00:1f.4: Timeout waiting for interrupt!
[  474.999303] i801_smbus 0000:00:1f.4: Transaction timeout
[  475.001661] i801_smbus 0000:00:1f.4: Failed terminating the transaction
[  475.001751] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!

I executed the commands, and these are, I guess, the related lines. in dmesg. So they are indeed connected right?

I’m not sure, possibly not. On the system where the touchpad works, can you run ls -l /sys/bus/acpi/devices/SYNA8004:00/physical_node/?

I will, first thing tomorrow. Thanks for all the help so far. I think I understand the problem way better for now. Unfortunately, it is already quite late here. Thanks, so far. I will report tomorrow.

Hi, so the output for the acpi device on the running system looks as follows:

ls -l /sys/bus/acpi/devices/SYNA8004\:00/physical_node/
total 0
drwxr-xr-x 5 root root    0 Aug 31 07:30 0018:06CB:CD8B.0001
lrwxrwxrwx 1 root root    0 Aug 31 07:30 driver -> ../../../../../../bus/i2c/drivers/i2c_hid
lrwxrwxrwx 1 root root    0 Aug 31 07:31 firmware_node -> ../../../../../LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:7a/SYNA8004:00
-r--r--r-- 1 root root 4096 Aug 31 07:31 modalias
-r--r--r-- 1 root root 4096 Aug 31 07:30 name
drwxr-xr-x 2 root root    0 Aug 31 07:31 power
lrwxrwxrwx 1 root root    0 Aug 31 07:30 subsystem -> ../../../../../../bus/i2c
-rw-r--r-- 1 root root 4096 Aug 31 07:30 uevent

That looks all good. Is there a way to determine if this is related to an update in the kernel? Because, if we need hours to figure it out it might be faster to just install a new Manjaro for me. Unless, the same problem persists as soon as I update to a newer kernel.

I tried now also going back to kernel version 5.4.60-2-MANJARO. The errors related to the smbus in dmesg are gone here, but the touchpad does not work either. And the output for the ACPI device looks the same.

I don’t understand what goes wrong here. Is there anything that I could have changed in my config, to make this problem to appear? I went through the kernel logs between 5.7.9 and 5.7.15 and found both in 5.7.10 and 5.7.11 some changes to the i2c touchpad modules. But I am not sure, if any of these are causing the problem.

That looks all good. Is there a way to determine if this is related to an update in the kernel?

Possibly the simplest way to determine if it is related to the kernel is to simply reinstall Manjaro, and if the touchpad works, update the kernel right away and see if it stays functioning.

I went through the kernel logs between 5.7.9 and 5.7.15 and found both in 5.7.10 and 5.7.11 some changes to the i2c touchpad modules. But I am not sure, if any of these are causing the problem.

I did that as well, but I couldn’t see anything that might cause your problem.

Is there anything that I could have changed in my config, to make this problem to appear?

I’m tempted to say it’s a kernel problem, but I’m not sure. If you have a certainly working, and a certainly not working kernel, then you could git-bisect it to find the commit that caused the problem.

Thanks. If I sort out my backups etc. I will try to install a fresh manjaro tomorrow or so. Unfortunately I need the device for work, and a broken touchpad is better than a broken machine… Maybe I create a separate partition and try it there.

I found this long thread here: bugs.launchpad. net/ubuntu/+source/linux/+bug/1861610 . And I have the feeling it is related. But I can’t get the solution there to work.

Thanks for all the help! I will keep you updated.

The solution there involves modifying ACPI tables, but if the touchpad has worked before, and the ACPI tables haven’t been modified (by means of BIOS/firmware update, etc.), then it is a regression in the kernel.

I see. The problem is, that I (will never do that again) did the pamac update and fwupdmgr updates in one row, without a restart. Never ever again, but everything was working so smoothly the last months, that I got sloppy.

Anyway, since it works in the live system, who knows what went wrong… I will give it a try and install it. Update to the same kernel and see what happens.

I’m thinking kernel regression, but we will see.

Hi,
so I finally found the time to try the same kernel with a fresh instal with the latest 5.8.6-1-MANJARO kernel on both systems. And it works on the freshly installed system :frowning: So it must be some configuration problem. No idea… Maybe I will just reinstall then. Any ideas welcome, but I guess, figuring this out will take much more time than a simple reinstall.