Troubles with ACPI on HP nx5000 laptop

[Nate Lawson]

Dmitry Kondratyev wrote:
> NL> NL> After it has hung, please break to DDB
> NL> (ctrl-alt-backspace) and do a ps.  Go through doing a "tr" on each
> NL> process id that looks interesting, looking for stacks that have
> NL> "acpi_tz" functions in them.  Email me the process stack info.  It's
> NL> obvious that you're getting a deadlock in the acpi thermal zone
> NL> switching code but we need to figure out how.
> 
>     I don't think it's deadlock, because I found only one process
>     callling acpi_tz funcs.

I didn't mean two separate processes deadlock but just a situation where 
a thread stops without making progress.

>     > ps
>     45 c15b8c5c d4de5000   0     0       0       0000204  [RUNQ]
>     acpi_thermal
>     > trace 45
>     sched_switch(c155f640,0,1,5e21f7f1,5e141b1) at sched_switch+0x160
>     mi_switch(1,0,d3becca8,10) at mi_switch+0x1d9
>     sleepq_switch(c07a4694,c155f640,d3becce0,c04e1dcc,c07a4694) at
>     sleepq_switch+0x167
>     sleepq_timedwait(c07a4694,54,c07a46a0,c07a0150,0) at
>     sleepq_timedwait+0x12
>     msleep(c07a4694,c07a46a0,254,c07a0150,3e8) at msleep+0x3bc
>     acpi_tz_thread(0,d3becd48,68bf09fc,85e800c6, 2c483cd) at
>     acpi_tz_thread+0x1da
>     fork_exit(c07902f0,0,d3becd48) at fork_exit+0x80
>     fork_trampoline() at fork_trampoline+0x8
>     --- trap 0x1, eip = 0, esp = 0xd3becd7c, ebp = 0 ---

This looks normal.  It just means there's no work for the thermal thread 
to do so it sleeps.  I wonder why it's on the RUNQ though?

Please recompile your acpi module with options ACPI_DEBUG.  Then set 
this at the loader prompt or in loader.conf:

debug.acpi.layer="ACPI_THERMAL"
debug.acpi.level="ACPI_LV_OBJECTS ACPI_LV_ALL_EXCEPTIONS"

Send me the output after a hang.

>     Furthermore,  after  "cont"  in  ddb,  everything worked for a few
>     seconds. And it always works for a while till hangs again if after
>     hanging  I  call  ddb and type "cont". Maybe it will "unhang" if I
>     wait till CPU gets cold.

If you have a serial console, a ps on all threads once it hangs would be 
helpful.

-- 
Nate