>Number:         8633
>Category:       kern
>Synopsis:       Kernel which is enabled USB device is panic when change Display.
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people (Kernel Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Oct 16 03:30:01 1999
>Last-Modified:
>Originator:     HEO SeonMeyong
>Organization:
	Internet Research Institute, Inc.
>Release:        1999/10/16
>Environment:
	Machine is DELL Latitude CPi D300XT
System: NetBSD laysner.grid.iri.co.jp 1.4L NetBSD 1.4L (LAYSNER.v6) #0: Sat Oct 16 15:53:37 JST 1999 seirios@laysner.grid.iri.co.jp:/usr/src/sys/arch/i386/compile/LAYSNER.v6 i386


>Description:
	kernel trace result is following.

tsleep(f02fcde4, 10, f026bf32, 1a, f02fcdf8) at tsleep+0x7c
usb_delay_ms(f059f000, fa) at usb_delay_ms+0x53
uhci_power(0,f059f000 at uhci_power+0x11f
dopowerhooks(0,38083053, f02fce78, f05a0400, f02fce60) at dopowerhooks+0x1d
apm_resume(f05a0400, f02fce78, f02fce78, f05a0400, 7fffffff) at apm_resume+0x1d
apm_event_handle(f05a0400, f02fce78) at apm_event_handle+0x145
apm_periodic_check(f05a0400) at apm_periodic_check+0x2f
softclock(f0598c20, f02b9680, f02b9680, f02fced0, f020930f) at softclock+0x6a
hardclock(f02fcedc, f02fced8, f0100d80, f02fcedc, 0) at hardclock+0x47a
clockintr(f02fcedc) at clockintr+0x0b
Xintr0() at Xintr0+0x70
--- interrupt ---
idle(....) at ...
bpendtsleep(...) at ...
uvm_scheduler(...) at ...
main(...) at ...

	I found this problem about 1 months ago, but I cannot understand
	why cause this problem.

	I tried to suspend about to run /usr/sbin/zzz, but this has no trouble.
	This problem causes only do "Calling BIOS."

>How-To-Repeat:
	1) Using DELL Latitude CPi D300XT and enable USB device drivers.
	2) Change to BIOS Setup mode or change Display from LCD to external Display
	3) Return to UNIX, kernel is paniced.
>Fix:
	Reporting only.
>Audit-Trail:
>Unformatted: