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kern/49783: USB WiFi ural0 rejects hw.acpi.sleep.state=3

>Number:         49783
>Category:       kern
>Synopsis:       USB WiFi ural0 rejects hw.acpi.sleep.state=3
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Mar 25 05:45:00 +0000 2015
>Originator:     Makoto Fujiwara
>Release:        NetBSD 7.99.6
KINU Corporation
System: NetBSD 7.99.6 NetBSD 7.99.6 (GENERIC.201503170630Z) #0: Tue Mar 17 08:57:29 UTC 2015 i386
Architecture: i386
Machine: i386
	If USB WiFi ural0 inserted, you may see:
	ural0 at uhub1 port 2
	ural0: Buffalo WLI-U2-KG54, rev 2.00/0.01, addr 2
	ural0: MAC/BBP RT2570 (rev 0x03), RF RT2526
	ural0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
	ural0: 11g rates: 1Mbps 2Mbps 5.5Mbps 11Mbps 6Mbps 9Mbps 12Mbps
	       18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
	"sysctl -w hw.acpi.sleep.state=3" is rejected as below.
	Mar 25 13:35:51 cf-r4 /netbsd: acpi0: entering state S3
	Mar 25 13:35:51 cf-r4 /netbsd: Devices without power management support: ural0
	Mar 25 13:35:51 cf-r4 /netbsd: acpi0: aborting suspend
	1. Have (probably note) PC with "sysctl hw.acpi.sleep.states" include S3, say,
	   hw.acpi.sleep.states = S0 S3 S4 S5
	2. Have USB WiFi device of ural category.
	3. Install NetBSD 6.1.* or 7.99.*, and boots
	   (mikutter/teokure live USB by tsutsui may probably be fine)
	4. Insert above ural device into USB port.
	5. See when the following command typed with root privilidge
	   sysctl -w hw.acpi.sleep.state=3
	Looking with recent changes on if_run.c by nonaka@, 
	I made following, thanks.
--- sys/dev/usb/if_ural.c.~1.44.~	2013-01-22 21:40:43.000000000 +0900
+++ sys/dev/usb/if_ural.c	2015-03-25 11:18:58.000000000 +0900
@@ -524,6 +524,9 @@ ural_attach(device_t parent, device_t se
 	usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->sc_udev,
+	if (!pmf_device_register(self, NULL, NULL))
+	  aprint_error_dev(self, "couldn't establish power handler\n");
@@ -537,6 +540,8 @@ ural_detach(device_t self, int flags)
 	s = splusb();
+	pmf_device_deregister(self);
 	ural_stop(ifp, 1);
 	usb_rem_task(sc->sc_udev, &sc->sc_task);


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