http://bugzilla.kernel.org/show_bug.cgi?id=11312
Summary: ACPI_EVENT_RTC handler gets spontaneously disabled
Product: ACPI
Version: 2.5
KernelVersion: 2.6.27-rc2-git (as of 11-aug-2008 evening)
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: Other
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
Latest working kernel version: unknown
Earliest failing kernel version: unknown
Distribution: Ubuntu 8.04
Hardware Environment: Intel Core2 laptop (DELL), ICH8M, HPET enabled
Software Environment: (as summarized above)
Problem Description:
I had rtc-cmos working through the ACPI interrupt handling infrastructure,
which avoids the problematic "HPET emulation". Tested it with the code
from Documentation/rtc.txt and it passes. With the UIE test code from
bug 11153, ditto. System sat unused overnight.
The next morning, those tests failed. In /sys/firmware/acpi/interrupts
the ff_rt_clk said "166 invalid". Something spontaneously invalidated
that handler ... it was no code of mine, which would only deregister the
handler on rmmod or startup error. The driver was non-modular, ruling
out the former, and is long past startup errors.
Possibly related: once during testing I saw the same "invalid" status
for this handler, right after driver setup. At the time I was puzzled,
but thought it was something I had done wrong while fixing other code.
Now I'm not so sure ... I think there's probably something wrong with
how ACPI handles at least ACPI_EVENT_RTC handlers.
Steps to reproduce:
(a) Apply the patch from bug 11153.
(b) Use test programs, like rtctest or uie2 from bug 11153
(c) ... until it fails sometime
That is, I don't know precisely how to reproduce this, but since it's
appeared a number of times now, I believe it will do so again.
Severity flagged as "high" since this would prevent sane fixes to
bug 11153, and it's clear something is deeply goofy here.
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