NV_VIO_SR_PLANE_MASK_INDEX
regp->Sequencer[NV_VIO_SR_PLANE_MASK_INDEX] = 0x0F;
NVWriteVgaSeq(dev, 0, NV_VIO_SR_PLANE_MASK_INDEX, 1 << plane);
seq2 = NVReadVgaSeq(dev, 0, NV_VIO_SR_PLANE_MASK_INDEX);
NVWriteVgaSeq(dev, 0, NV_VIO_SR_PLANE_MASK_INDEX, seq2);