mmCRTC_BLANK_CONTROL
uint32_t value = dm_read_reg(tg->ctx, CRTC_REG(mmCRTC_BLANK_CONTROL));
dm_write_reg(tg->ctx, CRTC_REG(mmCRTC_BLANK_CONTROL), value);
dm_write_reg(tg->ctx, CRTC_REG(mmCRTC_BLANK_CONTROL), 0);