[Bug 50024] Re: Thinkpad T43 2.6.15-23/25, system slow to use due to CPU spikes

[Joe Kislo]

So for my own sanities sake let me give numbers to the symptoms

Symptom #1:
CPU spikes, which over time, evenutally turn into a continual stream of user and system time.  Eventually the cpu will never spin down from MAX.
Kernels present in: 2.6.15-23, 2.6.15-25
Kernels NOT present in: 2.6.12-9

Symptom #2:
Holycrap the system is unusably slow.  I can type faster than my terminal window can keep up with me.  Opening a window causes the video to be so slow I can watch it paint
Kernels present in: 2.6.15-25
Kernels NOT present in: 2.6.15-23, 2.6.12-9

I can confirm that if I boot the 2.12.15-23 kernel with ACPI=off,
symptom #1 goes away.  If I boot the 2.12.15-25 kernel with ACPI=off,
both symptom #1 and #2 goes away.

So this makes my laptop usable again. Yay!  Except it's a plugged-in-
only laptop now.. Since all of the battery management doesn't work, and
the cpu is stuck at max.

I looked at the differences for the lspci, and the only difference is
the wireless card (I have the ABG card)

-0000:04:02.0 Network controller: Intel Corporation PRO/Wireless 2915ABG MiniPCI Adapter (rev 05)
+0000:04:02.0 Network controller: Intel Corporation PRO/Wireless 2200BG (rev 05)

the lsmod is pretty different. I will attach both.


** Attachment added: "T43 with problem lspci"
   http://librarian.launchpad.net/3096595/t43-with-problem-lspci

** Attachment added: "T43 with problem lsmod"
   http://librarian.launchpad.net/3096596/t43-with-problem-lsmod

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Thinkpad T43 2.6.15-23/25, system slow to use due to CPU spikes
https://launchpad.net/bugs/50024