NV_VIO_SR_CLOCK_INDEX
seq1 |= (NVReadVgaSeq(dev, nv_crtc->index, NV_VIO_SR_CLOCK_INDEX) & ~0x20);
NVWriteVgaSeq(dev, nv_crtc->index, NV_VIO_SR_CLOCK_INDEX, seq1);
regp->Sequencer[NV_VIO_SR_CLOCK_INDEX] = 0x29;
regp->Sequencer[NV_VIO_SR_CLOCK_INDEX] = 0x21;
saved_seq1 = NVReadVgaSeq(dev, 0, NV_VIO_SR_CLOCK_INDEX);
NVWriteVgaSeq(dev, 0, NV_VIO_SR_CLOCK_INDEX, saved_seq1 & ~0x20);
NVWriteVgaSeq(dev, 0, NV_VIO_SR_CLOCK_INDEX, saved_seq1);
seq1 = NVReadVgaSeq(dev, head, NV_VIO_SR_CLOCK_INDEX);
NVWriteVgaSeq(dev, head, NV_VIO_SR_CLOCK_INDEX, seq1 | 0x20);
NVWriteVgaSeq(dev, head, NV_VIO_SR_CLOCK_INDEX, seq1 & ~0x20);
uint8_t seq1 = NVReadVgaSeq(dev, head, NV_VIO_SR_CLOCK_INDEX);
NVWriteVgaSeq(dev, head, NV_VIO_SR_CLOCK_INDEX, seq1 | 0x20);
NVWriteVgaSeq(dev, head, NV_VIO_SR_CLOCK_INDEX, seq1 & ~0x20); /* reenable display */