Bug 8955
Summary: | cpufreq scaling not available (Sumicom S635F, 945GM, PhoenixAward 6.00, CoreDuo L2400) | ||
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Product: | ACPI | Reporter: | Armin Thiele (myforumemail) |
Component: | BIOS | Assignee: | Venkatesh Pallipadi (venki) |
Status: | CLOSED INVALID | ||
Severity: | normal | CC: | acpi-bugzilla, venki |
Priority: | P1 | ||
Hardware: | All | ||
OS: | Linux | ||
Kernel Version: | 2.6.* | Subsystem: | |
Regression: | --- | Bisected commit-id: | |
Attachments: |
acpidump
Output of iasl: 2 Errors cat /proc/cpuinfo DSDT.dsl |
Description
Armin Thiele
2007-08-29 08:29:47 UTC
Created attachment 12617 [details]
acpidump
Created attachment 12618 [details]
Output of iasl: 2 Errors
Created attachment 12621 [details]
cat /proc/cpuinfo
Created attachment 12638 [details] DSDT.dsl I tried to learn from bug 7578, especially #58 from Zhang Rui: "... performance control(P-state) is implemented through three optional objects(_PCT,_PSS and _PPC)" These objects are not present in my disassembled DSDT. Does this mean bios is not supporting speedstep at all? If so, are there any cances left to get it work? TIA Armin re: comment #4 that is correct, if ACPI the BIOS doesn't have _PCT and _PPC, then it doesn't have P-state support. Further, this BIOS has no SSDT, no _PDC and no Load() instructions, so what you see is what you get. > Genuine Intel(R) CPU L2400 @ 1.66GHz The specs for the L2400 do say that it has Enhanced Intel SpeedstepĀ® Technology http://processorfinder.intel.com/Details.aspx?sSpec=SL8VW so the processor hardware does support P-states. note that it is conceivable (though I've never seen it on a notebook) that the reason that the BIOS doesn't have support is because the motherboard doesn't have support. I think if the notebook as a Centrino sticker on the outside, that it is likely that it is required to support P-states. So your best bet is to check for the latest BIOS from the laptop supplier. Also, it is possible that they disabled this by default and there are some BIOS SETUP options that will give you what you are looking for. (In reply to comment #5) Thank you for your answer. Manufacturer (King Young, TW) confirmed that Sumicom products do not support Speedstep. HTH Armin |