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I've got a problem with a VIA C3 (1GHz)-system: the system freezes immediately when the CPU frequency goes under 731MHz because of an incompatibility with the (not completely implemented) i686 commands and a powersave feature of the kernel.

There is a workaround: deactivate the "longhaul" kernelmodule via alias longhaul off in /etc/modprobe.d/aliases.

But the system freezes before I can install any Linux distribution - even Clonezilla freezes.

Is there a possibility to deactivate the module with a GRUB boot parameter before the kernel is loaded?

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  • Add longhaul.enable=0 as a boot option. Based on some reading, I think @lornix might have gotten in backwards because some other folks gave the advice. See, for example, Longhaul problems - how to deactivate?
    – jww
    Commented Feb 2, 2016 at 5:05

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Reset to default
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From what I can find, it looks like adding this to your grub boot line will disable the longhaul cpufreq module.

longhaul.disable=1

Once you're booted, of course, add that to your grub configuration so it sticks around without your intervention. You might add an additional boot entry in your grub menu WITHOUT this parameter so you can 'test-boot' to see if a later kernel has resolved the issues you're experiencing.

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  • For the 4.2.0 kernel, longhaul.disable=1 results in dmesg "longhaul: unknown parameter 'disable' ignored". It looks like longhaul.enable=0 is the magic, but its noisy too: "longhaul: Option "enable" not set. Aborting."
    – jww
    Commented Feb 12, 2016 at 22:43

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