Re: [Alsa-user] acpi
Brought to you by:
perex
From: Dominique M. <dom...@ci...> - 2007-01-13 19:28:53
|
Le Fri, 12 Jan 2007 10:35:05 +1100, Geoff Beasley <son...@bi...> a =C3=A9crit : > anyone know what problems or benefits disabling acpi has ? any side-effec= ts=20 > for apic or xt-pic? any differences with 32 bit v 64 bit ? >=20 >=20 For what I know, it must do a difference only when running a realtime kernel and if you have shared IRQ or want to use the IRQ 9 for the sound card (or another hardware). acpi usually is on IRQ 9, and IRQ 9 is a very good IRQ for a sound card (it have a high hardware priority). With a kernel without realtime preemption, = you will see no difference and it must work with shared IRQ without problem. But realtime kernel are very sensitive with shared IRQ. The problem is at 2 different hardwares will get the same priority, and if one of those hardwar= e is the sound card (or a hardware with a high priority), it will generally hang the system. To disable acpi can be a simple way (sometime the only one) in order to free an IRQ. I read something about apic and xt-pic, but I have lost the reference. apic= is more advanced but is not a fully new hardware design. That is a new design,= but over the xt-pic. That implies at apic have more hardware overrun as xt-pic.= I don't know if the difference will or can play a roll with a realtime kernel. Be aware at a laptop without acpi will just not work in most if not all cas= es, but a desktop must just be fine with xt-pic or acpi. Ciao, Dominique |