[kwin] [Bug 521837] After updating KDE Plasma to version 6.7, Plasma fails to launch with Wayland, but still launches with X11

https://bugs.kde.org/show_bug.cgi?id=3D521837

Zamundaaa <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REPORTED                    |NEEDSINFO
         Resolution|---                         |WAITINGFORINFO

--- Comment #14 from Zamundaaa <[email protected]> ---
Alright, there are some interesting parts in there. DRM_IOCTL_SET_MASTER fa=
ils
with EBUSY, so some other file descriptor already has drm master (in KWin or
outside).

This part means KWin in some way opened 0xe200, got drm master (auth=3D1), =
and
dropped it again:
> [42799.687225] nouveau 0000:06:00.0: [drm:drm_open_helper] comm=3D"kwin_w=
ayland", pid=3D184295, minor=3D0
> [42799.687384] nouveau 0000:06:00.0: [drm:drm_ioctl] comm=3D"kwin_wayland=
" pid=3D184295, dev=3D0xe200, auth=3D1, DRM_IOCTL_AUTH_MAGIC
> [42799.687392] nouveau 0000:06:00.0: [drm:drm_authmagic] 0
> [42799.687399] nouveau 0000:06:00.0: [drm:drm_ioctl] comm=3D"kwin_wayland=
", pid=3D184295, ret=3D-22
> [42799.687405] nouveau 0000:06:00.0: [drm:drm_ioctl] comm=3D"kwin_wayland=
" pid=3D184295, dev=3D0xe200, auth=3D1, DRM_IOCTL_SET_CLIENT_CAP
> [42799.687411] nouveau 0000:06:00.0: [drm:drm_ioctl] comm=3D"kwin_wayland=
", pid=3D184295, ret=3D-95
> [42799.687417] nouveau 0000:06:00.0: [drm:drm_ioctl] comm=3D"kwin_wayland=
" pid=3D184295, dev=3D0xe200, auth=3D1, DRM_IOCTL_DROP_MASTER

I tracked this down to be in Mesa, specifically Vulkan. While it does drop =
drm
master, for some reason the return value is missing from the log... More
importantly, there's also
> [42799.698938] nouveau 0000:06:00.0: [drm:drm_open_helper] comm=3D"kwin_w=
ayland", pid=3D184295, minor=3D0
> [42799.699030] nouveau 0000:06:00.0: [drm:drm_ioctl] comm=3D"kwin_wayland=
" pid=3D184295, dev=3D0xe200, auth=3D1, DRM_IOCTL_AUTH_MAGIC
> [42799.699048] nouveau 0000:06:00.0: [drm:drm_authmagic] 0
> [42799.699054] nouveau 0000:06:00.0: [drm:drm_ioctl] comm=3D"kwin_wayland=
", pid=3D184295, ret=3D-22
which does not drop drm master and almost certainly causes the problem.

I couldn't find any code path in Mesa that would do this, but perhaps I'm
mistaken. Try adding
KWIN_DISABLE_VULKAN=3D1
in /etc/environment and reboot afterwards. Does that make things work again?

If yes, do you have any Nvidia Vulkan drivers still installed that might be
interfering?

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