SOLUTION
I understand that you want to take advantage of the feel and counterweight of a digital piano.
Nowadays, a keyboard with USB-MIDI is the standard and will give you fewer problems.
You can have several midi keyboards connected at the same time, either in series or in parallel.
To the subject:
Use a cheap USB keyboard (MIDI controller) to connect the pedal, and leave the piano for the musical performance.
If it is a hardware problem with the digital piano, this should work correctly, with the added advantage that you now also have a small midi controller with which to automate other issues.
HARDWARE IN LINUX
Before buying any Linux hardware you must check that it is compatible.
For me, the most effective thing is to consult it on Amazon, Thomann or a search engine: device "linux".
They say that Linux users are only 2%, but when you go to device comments, you see that there is a much higher percentage of users who ask or point out that this or that device is actually compatible.
I don't know why this insistence on falsifying the official percentages. But if I look at comments in online stores, and even in my immediate environment, my calculations say that we are not 2% but 20%.
Anyway, this last point goes beyond the topic discussed, but I think it is relevant to point it out.
SOLUTION
I understand that you want to take advantage of the feel and counterweight of a digital piano.
Nowadays, a keyboard with USB-MIDI is the standard and will give you fewer problems.
You can have several midi keyboards connected at the same time, either in series or in parallel.
To the subject:
Use a cheap USB keyboard (MIDI controller) to connect the pedal, and leave the piano for the musical performance.
If it is a hardware problem with the digital piano, this should work correctly, with the added advantage that you now also have a small midi controller with which to automate other issues.
HARDWARE IN LINUX
Before buying any Linux hardware you must check that it is compatible.
For me, the most effective thing is to consult it on Amazon, Thomann or a search engine: device "linux".
They say that Linux users are only 2%, but when you go to device comments, you see that there is a much higher percentage of users who ask or point out that this or that device is actually compatible.
I don't know why this insistence on falsifying the official percentages. But if I look at comments in online stores, and even in my immediate environment, my calculations say that we are not 2% but 20%.
Anyway, this last point goes beyond the topic discussed, but I think it is relevant to point it out.