device_probe_and_attach: atkbd0 attach returned 6

On some computers based on i845G after loading kernel the keyboard does not
work:

5.1 BETA / 5.0 RELEASE:

atkbdc0: <Keyboard controller (i8042)> port 0x64,0x60 irq 1 on acpi0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
atkbd: the current kbd controller command byte 0047
atkbd: keyboard ID 0xffffffff (1)
atkbd: failed to reset the keyboard.
device_probe_and_attach: atkbd0 attach returned 6
psm0: <PS/2 Mouse> irq 12 on atkbdc0
atkbdc: atkbdc0 already exists; skipping it
atkbd: the current kbd controller command byte 0065
atkbd: keyboard ID 0xffffffff (1)
atkbd: failed to reset the keyboard.

I set hint.atkbd.0.flags="0x2" in /boot/device.hints, and keyboard has work:

atkbdc0: <Keyboard controller (i8042)> port 0x64,0x60 irq 1 on acpi0
atkbd0: <AT Keyboard> flags 0x2 irq 1 on atkbdc0
atkbd: the current kbd controller command byte 0047
atkbd: keyboard ID 0xffffffff (1)
kbd0 at atkbd0
kbd0: atkbd0, AT 84 (1), config:0x2, flags:0x1d0000
psm0: <PS/2 Mouse> irq 12 on atkbdc0
atkbdc: atkbdc0 already exists; skipping it

So should be ?

Thanks!