ENVY24HT_MT_INT_STAT
intr = envy24ht_rdmt(sc, ENVY24HT_MT_INT_STAT, 1);
envy24ht_wrmt(sc, ENVY24HT_MT_INT_STAT, (intr & mask) | ENVY24HT_MT_INT_PSTAT | 0x08, 1);
envy24ht_wrmt(sc, ENVY24HT_MT_INT_STAT, (intr & mask) | ENVY24HT_MT_INT_RSTAT, 1);