computer makes high pitched noise when turned on

the T23, the problem was related to the graphics circuitry and occured especially or only while making use of DirectDraw functions.

Graphics processor: In some models from the T2x era, e.g.

CPU activity: On some models the noise is triggered by certain CPU power states or activity patterns (as proven here).

Turning off fan stops pitch noise instandly.Īll, though Linux appears especially susceptible. High pitch noise, screeching sounds *solved by 'Media player paused' (see below) and also by BIOS versions 1.05 and later.

pitch noise from left speaker or cpu.Ĭonstant, but is louder when Tablet Pen is near screen, on battery power Network is pluged in and networkload is ~100%. Screetching high pitch noise, like a million crickets Noise level varies from inaudible to clearly audible, screeching sound, or sometimes beeping (when wifi is on).ĬPU is used much AND laptop is on AC power AND the TFT panel is enabled. 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.

7 Solutions for screen brightness related soundsĮven though ThinkPads are known as very silent notebooks, they tend to emit different, mostly high pitch noises in certain circumstances.

6.6 Change the timer interrupt frequency.

6.5 Use both C-States (sleep modes) and P-States (frequency scaling).

6.3 Turn off CPU power saving in the BIOS.

Computer makes high pitched noise when turned on