AVIVO_D1CRTC_CONTROL
reg = Read32(OUT, AVIVO_D1CRTC_CONTROL)
gpuState->d1crtcControl = Read32(OUT, AVIVO_D1CRTC_CONTROL);
Write32(OUT, AVIVO_D1CRTC_CONTROL, 0);
Write32(OUT, AVIVO_D1CRTC_CONTROL, gpuState->d1crtcControl);
Read32(CRT, AVIVO_D1CRTC_CONTROL));