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I installed arch linux on my netbook.
It's a Medion Akoya E1315 with Sempron 210U cpu.
On boot I get an error about ACPI PSS objects missing. Somehow the BIOS is not giving the proper info about which frequencies are available.
I already tried loading powernow-k8, acpi-cpufreq but both give the same error.
modprobe: ERROR: could not insert 'acpi_cpufreq': No such device
and
modprobe: ERROR: could not insert 'powernow_k8': No such device
Last edited by s0lar (2014-01-13 12:29:22)
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What's the output of 'ls /lib/modules/$(uname -r)/kernel/drivers/cpufreq/'?
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The acpi DSDT table is incomplete on that machine, you won't be able to get scaling working. I found this, it says he managed to put additional pstates into the DSDT table and got dynamic pstate switching working, but at constant voltage. Which is useless, switching just freq you're wasting even more power than running at the freq the voltage is meant for. Proper scaling requires changing both freq and voltage.
Edit: This is interesting, a post on how to mess with the DSDT and SSDT tables: http://peppermintos.net/viewtopic.php?p=38838#p38838 <- at least from the looks of it, that table also provides voltage changes.
Last edited by Gusar (2014-01-12 23:39:55)
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Thanks, I tried to decompile the DSDT and SSDT tables but recompiling it gives me a lot of warnings and errors. I managed to clean up the errors but don't know how to procede from there before fixing the warnings.
Output of : s /lib/modules/$(uname -r)/kernel/drivers/cpufreq/
acpi-cpufreq.ko.gz cpufreq_conservative.ko.gz cpufreq_stats.ko.gz p4-clockmod.ko.gz powernow-k8.ko.gz
amd_freq_sensitivity.ko.gz cpufreq_powersave.ko.gz cpufreq_userspace.ko.gz pcc-cpufreq.ko.gz speedstep-lib.ko.gz
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I decided to try with the compiled file even though there are warnings after the recompile.
It works! Thanks for helping me out.
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