[PATCH 1/3] RFC: drm: Restrict vblank ioctl to master

[Michel Dänzer]

On 13.07.2016 18:49, Rainer Hochecker wrote:
> We have been using this for years now and did not observe issues you
> mentioned. I would be surprised if a child window refreshes in a
> different rate than the main window

The Xorg driver decides which CRTC to synchronize with based on the
window geometry. For a window with no visible geometry, it may choose a
different CRTC than for the visible output window. In the case of DRI3,
the Xorg Present extension code may even fall back to the fake CRTC in
that case, which only generates a fake vblank event once every second.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer