Hi, I just continued experimenting.
What i just found out: * on my production setup, the CLUTTER_VBLANK=True works ! errmmm.. at 76 fps (???) How it this possible ? The left screen is ok but i'd like to sync to the secondary device * on my dev setup (gnome destkop), it doesn't (sluggish/instable fps rate) * when CLUTTER_VBLANK=True and __GL_SYNC_DISPLAY_DEVICE="TV-0" before importing clutter, it doesn't work (instable 43->60 framerate), the clutter log says "glXSwapIntervalSGI setup success" ! I think there's a hardware specific issue there, only with nvidia devices in TwinView extended destkop mode. Maybe there's additional OpenGL/driver-level debug info available somewhere ? How does the GL builtin SYNC_TO_VBLANK and clutter's glxSwapIntervalSGI differ ? Do they do the same ? Why does the SYNC_DISPLAY_DEVICE env var affect clutter (without the GL_SYNC_TO_VBLANK being set?). THanks for any hint ! Florent
