CDROM drives generate bogus interrupts reports on some Sun machines. Apply by doing: cd /usr/src patch -p0 003_sparc64cd.patch And then rebuild your kernel. Index: sys/dev/pci/pciide.c =================================================================== RCS file: /cvs/src/sys/dev/pci/pciide.c,v retrieving revision 1.71 retrieving revision 1.71.2.1 diff -u -r1.71 -r1.71.2.1 --- sys/dev/pci/pciide.c 29 Sep 2001 04:46:49 -0000 1.71 +++ sys/dev/pci/pciide.c 14 Nov 2001 03:00:46 -0000 1.71.2.1 @@ -2432,10 +2432,12 @@ if ((i == 0 && (priirq & CMD_CONF_DRV0_INTR)) || (i == 1 && (secirq & CMD_ARTTIM23_IRQ))) { crv = wdcintr(wdc_cp); - if (crv == 0) + if (crv == 0) { +#if 0 printf("%s:%d: bogus intr\n", sc->sc_wdcdev.sc_dev.dv_xname, i); - else +#endif + } else rv = 1; } }