Re: Laptop w/ dark screen & no (working) keyboard

After a reboot -- which exhibited the same symptoms initially:

login: lock order reversal:
 1st 0xc55bfad0 ufs (ufs) _at_ /usr/src/sys/ufs/ffs/ffs_snapshot.c:424
 2nd 0xd8d3fc50 bufwait (bufwait) _at_ /usr/src/sys/kern/vfs_bio.c:2443
 3rd 0xc52d337c ufs (ufs) _at_ /usr/src/sys/ufs/ffs/ffs_snapshot.c:545
KDB: stack backtrace:
db_trace_self_wrapper(c0bb77be,c4bbb40c,c0851645,4,c0bb2cb1,...) at db_trace_self_wrapper+0x26
kdb_backtrace(4,c0bb2cb1,c4d21810,c4d24e18,c4bbb468,...) at kdb_backtrace+0x29
_witness_debugger(c0bba487,c52d337c,c0bade76,c4d24e18,c0bd8a13,...) at _witness_debugger+0x25
witness_checkorder(c52d337c,9,c0bd8a13,221,0,...) at witness_checkorder+0x839
__lockmgr_args(c52d337c,80100,c52d3398,0,0,...) at __lockmgr_args+0x797
ffs_lock(c4bbb578,c0e35ee0,c55860a4,80100,c52d3324,...) at ffs_lock+0x8a
VOP_LOCK1_APV(c0cbf480,c4bbb578,c4bbb598,c0cd3400,c52d3324,...) at VOP_LOCK1_APV+0xa5
_vn_lock(c52d3324,80100,c0bd8a13,221,c4d55800,...) at _vn_lock+0x5e
ffs_snapshot(c51c0a00,c53029c0,c0bda378,15e,3,...) at ffs_snapshot+0x1527
ffs_mount(c51c0a00,c5586000,c0bc0c2b,3dc,c4e8ac80,...) at ffs_mount+0x146f
vfs_donmount(c5586000,211000,c52fdb00,c52fdb00,201000,...) at vfs_donmount+0x1312
nmount(c5586000,c4bbbcf8,c,c4bbbd38,c0c9b790,...) at nmount+0xbe
syscall(c4bbbd38) at syscall+0x2a3

-- I got involved in some other things, when I happened to see (on
the serial console):

Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (378, FreeBSD ELF32, nmount), eip = 0x280e6c9b, esp = 0xbfbfeb1c, ebp = 0xbfbfee78 ---
info: [drm] Setting GART location based on new memory map
info: [drm] Loading R200 Microcode
info: [drm] writeback test succeeded in 2 usecs
drm0: [MPSAFE]
drm0: [ITHREAD]
lock order reversal:
 1st 0xd8d3fc50 bufwait (bufwait) _at_ /usr/src/sys/kern/vfs_bio.c:2443
 2nd 0xc4f9f01c snaplk (snaplk) _at_ /usr/src/sys/ufs/ffs/ffs_snapshot.c:794
KDB: stack backtrace:
db_trace_self_wrapper(c0bb77be,c4bbb40c,c0851645,4,c0bb2cb1,...) at db_trace_self_wrapper+0x26
kdb_backtrace(4,c0bb2cb1,c4d21810,c4d25638,c4bbb468,...) at kdb_backtrace+0x29
_witness_debugger(c0bba46e,c4f9f01c,c0bd8a75,c4d25638,c0bd8a13,...) at _witness_debugger+0x25
witness_checkorder(c4f9f01c,9,c0bd8a13,31a,c55bfaec,...) at witness_checkorder+0x839
__lockmgr_args(c4f9f01c,80400,c55bfaec,0,0,...) at __lockmgr_args+0x797
ffs_lock(c4bbb578,0,0,80400,c55bfa78,...) at ffs_lock+0x8a
VOP_LOCK1_APV(c0cbf480,c4bbb578,c211a614,c0cd3400,c55bfa78,...) at VOP_LOCK1_APV+0xa5
_vn_lock(c55bfa78,80400,c0bd8a13,31a,0,...) at _vn_lock+0x5e
ffs_snapshot(c51c0a00,c53029c0,c0bda378,15e,3,...) at ffs_snapshot+0x28c6
ffs_mount(c51c0a00,c5586000,c0bc0c2b,3dc,c4e8ac80,...) at ffs_mount+0x146f
vfs_donmount(c5586000,211000,c52fdb00,c52fdb00,201000,...) at vfs_donmount+0x1312
nmount(c5586000,c4bbbcf8,c,c4bbbd38,c0c9b790,...) at nmount+0xbe
syscall(c4bbbd38) at syscall+0x2a3
Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (378, FreeBSD ELF32, nmount), eip = 0x280e6c9b, esp = 0xbfbfeb1c, ebp = 0xbfbfee78 ---


FreeBSD/i386 (Amnesiac) (ttyu0)

login: 

[end of cut/paste]

and the screen lit up.  :-}

Peace,
david
-- 
David H. Wolfskill				david_at_catwhisker.org
Depriving a girl or boy of an opportunity for education is evil.

See http://www.catwhisker.org/~david/publickey.gpg for my public key.