The first pen button does not use the newly assigned tool, but a faulty 'eraser cursor' is used instead. about xournalpp HOT 5 OPEN

Can confirm this to an extent with a Surface Pen Slim and Laptop Studio 2. While the eraser works as expected in both binding and function, the side button keeps the odd behavior you're describing where it doesn't ever do anything. It also keeps showing the current tool's hover indicator while I hold the side button with the pen close to the screen, while the eraser correctly switched tools when I brought it near the screen.

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I'm also experiencing this with xournalpp 1.2.2, but I think it worked previously with the same version (1.2.2). I noticed that in libinput debug-events, one button appears hard-coded as eraser (not sure if this was different a few months ago, but I suspect it was):

Pressing first button:

 event10  TABLET_TOOL_PROXIMITY   +6.353s		179.56/132.98	pressure: 0.00	pen      (0xc06037c9, id 0x805b) proximity-out 
 event10  TABLET_TOOL_PROXIMITY   +6.358s		179.58*/132.98*	pressure: 0.00*	eraser   (0xc06037c9, id 0x805b) proximity-in 	axes:p	btn:S
 event10  TABLET_TOOL_PROXIMITY   +6.487s		179.63/133.00	pressure: 0.00	eraser   (0xc06037c9, id 0x805b) proximity-out 
 event10  TABLET_TOOL_PROXIMITY   +6.492s		179.73*/133.04*	pressure: 0.00*	pen      (0xc06037c9, id 0x805b) proximity-in 	axes:p	btn:S

Pressing second button:

 event10  TABLET_TOOL_BUTTON      +8.445s	331 (BTN_STYLUS) pressed, seat count: 1
 event10  TABLET_TOOL_BUTTON      +8.579s	331 (BTN_STYLUS) released, seat count: 0

I suspect the change is unrelated to Xournalpp and related to a kernel upgrade: https://www.davidrevoy.com/article995/how-a-kernel-update-broke-my-stylus-need-help/show

See also the linked LKML thread.

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don't use that brother it doesn't work or you have to do a lot of testing to get it to work, I recommend that you assign the shortcut to your pen buttons in your graphics tablet software.

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It is unlikely to be a kernel bug, at least on my end. I am on Windows.

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Plus one. I have this same issue

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