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Command dmesg on my PC gives e.g. following:

[    0.123440] pci 0000:00:1f.0: [8086:24c0] type 0 class 0x000601
[    0.123446] * The chipset may have PM-Timer Bug. Due to workarounds for a bug,
[    0.123447] * this clock source is slow. If you are sure your timer does not have
[    0.123449] * this bug, please use "acpi_pm_good" to disable the workaround
[    0.123544] pci 0000:00:1f.1: [8086:24cb] type 0 class 0x000101

What does it mean?

Chipset is an old Intel 845GL/GV / Intel® ICH4

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1 Answer 1

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It means that your LPC device is old and contains a bug in the PM-Timer (most commonly known as "High Precision Event Time"). I wouldn't bother with it:

The Low Pin Count bus, or LPC bus, is used on IBM-compatible personal computers to connect low-bandwidth devices to the CPU, such as the boot ROM and the "legacy" I/O devices (behind a super I/O chip). The "legacy" I/O devices usually include serial and parallel ports, PS/2 keyboard, PS/2 mouse, floppy disk controller and—more recently—the Trusted Platform Module (TPM). The physical wires of the LPC bus usually connect to the southbridge chip on a PC motherboard, which contains the circuit equivalents of the "legacy" onboard peripherals of the IBM PC/AT architecture, such as the two programmable interrupt controllers, the programmable interval timer, and the two ISA DMA controllers.

Unless your TPM requires it and/or your system is giving you headaches related with any of those devices I wouldn't touch it.

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