After 7.3->8.1, moused on serial mouse draws 100% CPU

Michael Sperber sperber at
Thu Sep 16 09:56:59 UTC 2010

Jeremy Chadwick <freebsd at> writes:

> Michael, in the meantime can you provide dmesg details that pertain to
> your serial ports?  uartXX devices would be sufficient, in addition the
> device its attached to (e.g. acpi0, etc.).

uart0: <16550 or compatible> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
uart0: [FILTER]
acpi0: <080907 RSDT1802> on motherboard
acpi0: [ITHREAD]
acpi0: Power Button (fixed)
acpi0: reservation of 0, a0000 (3) failed
acpi0: reservation of 100000, 7ff00000 (3) failed

> (Footnote: I wasn't even aware people still had/used serial mice any
> more, given the popularity of PS/2, and now USB...)

They don't make trackballs like the old Kensington models anymore :-)


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