IBM Thinkpad T41p ACPI trouble.
Poul-Henning Kamp
phk at phk.freebsd.dk
Sat Jul 10 15:58:07 PDT 2004
I bought a Thinkpad T41p some weeks back, and to my delight ACPI
worked flawlessly. I could adjust the backlight, turn the little
white "head light" led on and off, suspend etc.
Then at some point, it started wedging solid at the mere thought
of ACPI.
Touching the "Fn" key and any other key is pure death, but touching
the Fn key alone gives me a NUL-char.
Tonight I went timetravelling with my kernel and get as far back as
first of may, but all along the same instant death if ACPI was provoked.
It is not quite instant if the laptop is running on batteries, but
it still dies within a few seconds.
The hang has all the hallmark properties of an interrupt storm, but
no kernel warning about interrupt storm results.
I fully understand what a wretched monster ACPI is and that I know
only the tiniest amount about what it is and does, but I'd like to
offer my help debugging this bug anyway.
Anyone have some good and clear suggestions for how to go from here ?
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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