Upstream has decided that modifiying the DSDT is too risky in general to
be something enabled in commonly shipped kernels, as it is possible to
write DSDTs which damage your hardware. It is therefore unlikely we
will resurect this DSDT patch for Karmic or later.
The upstream approach is to detect the bad machines and to work round
the bad entries in the DSDT at DSDT execute time. In this case that
might include detecting and 'adjusting' the sleeps which are faulty as
we execute them. In order to achieve this we would need to ensure we
have correctly identified these sleeps. At the URL below is a kernel
(kernels will be there shortly) with a debug patch applied which
atttempts to detect these sleeps and eliminate them (note this is
specific to the sleeps for this machine):
http://people.canonical.com/~apw/lp100110-karmic/
Could those of you who are affected try the kernel below and report
whether it helps or not. In either case please include dmesg output
from the boot with this kernel. Thanks!
** Changed in: linux (Ubuntu Karmic)
Status: In Progress => Incomplete
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18 seconds ACPI delay while booting due to DSDT
https://bugs.launchpad.net/bugs/100110
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