https://bugs.freedesktop.org/show_bug.cgi?id=103791
--- Comment #11 from denisgolovan@yandex.ru --- Yes, I fixed some small issues with the patch. Now I have following appear in dmesg: [ 2108.319205] [drm] drm_crtc_vblank_get returned -EINVAL [ 2108.319235] [drm] crtc 0 failed to acquire vblank counter, -22