Bug 381931

Using the pen with a Surface Book, Krita seems to only pick up the pen input correctly some of the time.

I'm running at 200% DPI, and on all occasions, Krita will prompt me to choose screen resolution - either 3000x2000 (Wintab) or 1500x1000 (Qt). On some occasions, picking the top [Wintab] option will work absolutely fine, and the pen input will work as expected. Other times, picking that option will operate with the pen input being detected 'offset' from its actual position - as though it hasn't detected the DPI correctly (i.e. positioning the pen 50% across the screen, Krita draws at a position 25% across the screen).

This can happen both while the screen is docked into the base, or when it's detached, so it's not dependent on which graphics card is active.

Sometimes, exiting Krita and restarting will fix it; other times, it won't, so it seems rather random. I've never observed picking the Wintab option causing it to work - that always seems broken (albeit I haven't exhaustively verified that it *never* works!). I have installed the Wintab drivers for the Surface Book.

The pen input works in other pen-enabled apps even when Krita's misdetecting it, so it certainly doesn't appear to be a hardware fault.

If there's any way to gather additional debug info that would help in tracking this down, I'm quite happy to do so, if anyone can direct me on how to do so.