I have Acer laptop with the Atheros card, identified as ath0@pci6:2:0: class=0x020000 card=0x04181468 chip=0x001a168c rev=0x01 hdr=0x00 vendor = 'Atheros Communications Inc.' class = network subclass = ethernet Corresponding dmesg lines are ath0: <Atheros 5212> mem 0xd0000000-0xd000ffff irq 22 at device 2.0 on pci6 ath0: Reserved 0x10000 bytes for rid 0x10 type 3 at 0xd0000000 ath0: [GIANT-LOCKED] Driver successfully attaches to the card and wifi connection works nice. There is some problem. At home, where I have no access point, I did ifconfig ath0 up ifconfig ath0 list scan Shortly after then, interrupt time goes to ~95%, top -S accounted the time to the ath0 interrupt thread. After ifconfig ath0 down machine returned to working condition. Some time later I did the same (in different location), while laptop was powered from battery and powerd ran. After short time, machine locked (presumably, due to interrupts being steadily delivered and lowered frequency of the CPU, that cannot cope with the interrupts stream). Other than that, machine is stable, buildworld/port build for several hours did not cause the problems. Any advise how can I help to debug the issue ? -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 187 bytes Desc: not available Url : http://lists.freebsd.org/pipermail/freebsd-stable/attachments/20070418/d047f915/attachment.pgp