Bug 7954
| Summary: | Mac Pro: Ubuntu kernel: Speedstep-centrino does not work | ||
|---|---|---|---|
| Product: | ACPI | Reporter: | Venkatesh Pallipadi (venki) |
| Component: | Power-Processor | Assignee: | Venkatesh Pallipadi (venki) |
| Status: | REJECTED INVALID | ||
| Severity: | normal | CC: | jonas.m.august |
| Priority: | P2 | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| Kernel Version: | 2.6.19.1 | Subsystem: | |
| Regression: | --- | Bisected commit-id: | |
| Attachments: |
acpidump output
dmesg |
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Created attachment 10323 [details]
acpidump output
Created attachment 10324 [details]
dmesg
venki, Is there any update for this bug? will you be the owner? From acpidump does not seem to have any _PSS intofrmation in there. So, no P-states can be supported. BIOS does not support P-states as per ACPI. I plugged my Mac Pro (8-core, 3GHz, 5GB via 2x512MB + 2x4GB RAM, 2 hard drive, ATI X1900XT graphics) into a Kill-a-watt power measuring device and found that, at idle, the Mac Pro used the same power under OS X 10.4.10, Ubuntu GNU/Linux Feisty, and Windows XP SP2 (manual install without Boot Camp). I measured 257 +- 2 watts. I only quickly checked, so I don't have useful numbers for power use under load, but it goes up, possibly 100-200 watts. So I'm no longer worried about the lack of speedstep under GNU/Linux, since even the highly-tuned OS X can't do any better at least at idle. Incidentally, sleep works fine with Feisty, though I did have to hassle with it at first. So some of ACPI must work. |
Most recent kernel where this bug did *NOT* occur:None Distribution: Hardware Environment: Software Environment: Problem Description: >David Tunkrans wrote: >> I found your email adress in the speedstep centrino kernel >source. Ive >> put down a lot of time into getting ACPI and speedstep working on my >> Mac Pro Ubuntu amd64 installation, with no success. Seems like the >> cpufreq parameters are "missing" even though the specification says >> that woodcrest Xeons do support speedstep. Also I suspect that there >> has to be specific support for Xeon processors in this >driver? I would >> really appreciate if you could point me in the right direction. I have tried the acpi-cpufreq driver, no difference there. I have read that some people have gotten the speedstep-centrino driver working under 32-bit ubunto, however Im using the amd64 ubunto distro and cant verify that. Also Im on my fourth custom kernel, testing different config:s ( 2.6.19.1). Attached is the acpidump + dmesg from my Mac Pro. If there is any more information that I can provide you with, please let me know. Steps to reproduce: