http://bugzilla.kernel.org/show_bug.cgi?id=14351
Summary: AML Sleep() in EC _REG causes boot delay
Product: ACPI
Version: 2.5
Kernel Version: 2.6.31
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: EC
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Regression: No
This is a windows compatibility issue more than it is
an issue with Linux/ACPI not implementing the ACPI specification,
but so be it.
Some vendors (Fujitsu) are shipping machines that have an enormous
Sleep() in the EC _REG method. The one in this bug report
has one for 10 seconds, plus another for 8 seconds:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/100110
This sleep delays Linux boot.
Curiously, Windows, and reportedly a 2.6.16 version of Linux
do not experience a boot delay due to to this. Perhaps
they are not actually implementing the requested delay,
or perhaps the EC's _REG method is executed in parallel
and the reset of boot completes, with the EC _REG completing
18 seconds later...
The current proposal in the bug report above is to DMI
the failing systems, and cut their long Sleep()s down
to shorter ones.
That is problematic, of course, for maintaining DMI is never-ending,
and we can never be sure that it is correct to shorten the Sleep().
So I think we should look into why EC _REG is serialized,
and see if we can un-serialize it.
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