https://bugzilla.kernel.org/show_bug.cgi?id=45151
--- Comment #21 from Feng Tang <feng.t...@intel.com> 2012-08-21 06:24:41 ---
(In reply to comment #16)
> Here it is the results but something strange happens. I've check three times
> but I think I'm doing something wrong.
>
> The strange behavior is that adding the string of comment #13 ("debug
> log_buf_len=8M cpi.debug_layer=0x1009001F acpi.debug_level=0x082002FF") to
> kernel boot parameter,
You can enter /sys/module/acpi/parameters, check debug_level and debug_layer to
see if they are really what we wanted to set.
> the acpi subsystem work vice versa as booting without the string. This mean
> that the acpi works with the if statement whereas stop working when is comment
> out (thus applying the patch of comment #1). On the other hand, when all the
> kernels are booted without the previous string the acpi subsystem work as
> described in the bug. Therefore, the string seems to invert the behavior of
> the
> acpi subsystem.
Yes, that's weird, Comment #1 should work while Comment #9 should not which
simply add some debug info. So the too many dmesg output must affect the time
sequence of EC(Embedded Controller), the EC on your platform is fragile which
force the driver to use polling mode for normal transaction, while normal EC
will use driver's interrupt driven mode.
Since the dmesg is too many and its ring buffer has been overwritten (the same
cmdline set doesn't have so many msg on my platform I can't find any useful
info from the dmesg. So need your help to do more tests as follows:
1. add "log_buf_len=8M acpi.debug_layer=0x0000001F acpi.debug_level=0x080002FF"
to cmdline
2.a test comment #1 + comment #14
2.b test comment #9 + comment #14
2.c test comment #1
2.d test comment #9
hope this time, the dmesg won't be wrapped.
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