https://bugs.winehq.org/show_bug.cgi?id=42749
--- Comment #9 from Henri Verbeet hverbeet@gmail.com --- In fact, https://cgit.freedesktop.org/xorg/xserver/commit/hw/xfree86/dri2/dri2.c?id=1... looks like it might be related. Is your X server from before that commit?