I tried below two patches, it could let my Yoga Gen5 works fine.
I could find pen setting at gnome-control-center when the pen touch the screen.
I could customize the second button as right click.
056a:51b9 Wacom Co., Ltd Pen and multitouch sensor
commit a864679083c035eb08a75cf084a6564d589c0b1c
Author: Jason Gerecke <killert...@gmail.com>
Date: Fri Nov 1 11:51:20 2019 -0700
Add multiple AES stylus definitions
Adds definitions for many different AES styli. The precise information
about supported features is hard to come by, but in general most pens
have two buttons (one of which is treated as an eraser) and can only
report pressure. A few exceptions are known or suspected and their
data has been set accordingly.
commit 8652aa3376bfb0e833af3704dc2ab7948958cd8f
Author: Jason Gerecke <killert...@gmail.com>
Date: Tue Oct 29 15:26:51 2019 -0700
Add isdv4-aes stylus group to all AES sensors
AES sensors determined based on comments and HID descriptors available
at the wacom-hid-descriptors repository, where available. Some pen/sensor
combinations may not truly be compatible with each other, but it difficult
to know a priori which are problematic. This ultimately doesn't matter
*too* much, however, since the ID list is primarily used by tools like
GNOME Control Center that just need a rough idea of what pens might work
with a given tablet during configuration.
** Attachment added: "aes_pen.png"
https://bugs.launchpad.net/ubuntu/+source/libwacom/+bug/1869059/+attachment/5444143/+files/aes_pen.png
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https://bugs.launchpad.net/bugs/1869059
Title:
Button 2 of my ThinkPad X1 Yoga's stylus is not detected
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https://bugs.launchpad.net/ubuntu/+source/libwacom/+bug/1869059/+subscriptions
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