http://bugzilla.kernel.org/show_bug.cgi?id=14700
Summary: Broken system because of a bad ACPI commit
Product: ACPI
Version: 2.5
Kernel Version: 2.6.31.9
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Processor
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: Yes
After an upgrade to 2.6.31 kernel, the system is very unstable.
Sometimes it doesn't boot. If it does, the laptop keyboard doesn't
work and after a few minutes it hangs with ATA errors.
I bisected this problem down to the following commit:
commit ee1ca48fae7e575d5e399d4fdcfe0afc1212a64c
Author: Pallipadi, Venkatesh <[email protected]>
Date: Thu May 21 17:09:10 2009 -0700
ACPI: Disable ARB_DISABLE on platforms where it is not needed
ARB_DISABLE is a NOP on all of the recent Intel platforms.
For such platforms, reduce contention on c3_lock
by skipping the fake ARB_DISABLE.
Signed-off-by: Venkatesh Pallipadi <[email protected]>
Signed-off-by: Len Brown <[email protected]>
With this commit reverted, the system works fine with 2.6.31.
$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 14
model name : Intel(R) Celeron(R) M CPU 410 @ 1.46GHz
stepping : 8
cpu MHz : 1463.194
cache size : 1024 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov
clflush dts acpi mmx fxsr sse sse2 ss tm pbe nx constant_tsc up arch_perfmon
bts pni monitor tm2 xtpr pdcm
bogomips : 2926.38
clflush size : 64
power management:
If I read the code correctly, in the commit message, "all of the
recent Intel platforms" seem to mean those with family == 6 and model
>= 14. My processor's model is 14 so could we have an
off-by-one error here?
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