-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Hello, For more info regarding the bios_limit setting see here: http://kernel.opensuse.org/cgit/kernel/commit/?id=e2f74f355e9e2914483db10c05... Probably the limitation can be ignored with: echo 1 > /sys/module/processor/parameters/ignore_ppc or with processor.ignore_ppc=1 as kernel parameter at boot time. But I'm not sure about this. Best Regards, I. Petrov On 04/12/2015 12:29 AM, don fisher wrote:
This one has been a real problem for me. I will provide a brief summary, and more specifics if requested. I have a couple of older laptops (AMD based Dell 1721) that I would like to use for reading documents etc. It took hours to install openSuse on them because the CPU speed is kept at the lowest level.
If I do a cpupower frequency-info, it provides a range of valid values from 0.8GHz to 2.2GHz. When I examine entries in /sys/devices/system/cpu/cpufreq I find:
cpuinfo_max_freq 2200000 cpuinfo_min_freq 800000 cpuinfo_cur_freq 800000 scaling_max_freq 800000 scaling_min_freq 800000 bios_limit 800000
I am worried about the "bios_limit" being set so low, and where does that setting come from. I did a grep on /etc, /usr/lib, /usr/lib64 and /usr/share and could find no file referencing bios_limit. When I searched /lib I found three modules, including the powernow-k8 module that included that reference. This bios_limit entry is also not present on my other, faster, machine, which does limit overclocking. And I see no place in the 1721 BIOS setup that allows setting a limit on CPU speed.
The list of available governors is userspace, ondemand and performance (currently set to userspace, probably because I tried manually the cpupower frequency-set -f 1800000 command, which had no effect.
I am back on my faster machine now, and plan to unroll the kernel source and see what I can discover there. I do not know if powernow-k8 sets, or just reads that entry. Any help would be appreciated. I just do not understand why the cpuinfo_max_freq entry can be set to 2.2GHz, while a limit is also set to 0.8GHz.
Don -----BEGIN PGP SIGNATURE----- Version: GnuPG v2
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