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When the CPU freq jumps up to 1Ghz or above, or when the laptop is in suspend modeĬontinuous, intermittent, low volume, high pitchedĪCPI puts the processor into the C3 or C4 power saving states (i.e., the system is idle).Ĭpufreqd (or powernowd etc.) slows down the processor, for exemple at the end of an heavy task. High pitch noise till battery is charged more than 60%. Thinkpad connected to power battery charged less than 60% High pitch noise also when HD is powered down. Thinkpad connected to power or working on battery, also when suspended to RAM Strange noise like a rapid series of very short high pitch noises adding to a constant kind of whistling (only as long as the movement goes) ThinkPad connected to power and switched off, with battery fully charged Plugged into AC / running at high CPU frequency Noises have been experienced in the following situations: However, there are those with "bat like ears" that hear them and might be annoyed by that. The noises are of low volume and hence not realized by everyone or at least tolerated by most people.