How do I turn ACPI ON/OFF?

  • saghaulor
Posted: Tue, 09/11/2007 - 19:18
In a previous thread we discoverd that ACPI may be at the heart of some peoples latency issues. I remember installing 64Studio with ACPI off as ACPI was for some reason causing my installation to crash. Now, I'm puzzled. 1] How do I check to see if it is currently enabled? 2] How do I enable it if it is currently disabled? Your assistance would be deeply appreciated. Yours, Stephen
‹ Does ESD affect JACK latency? changes from last release? ›

Just wondering...

  • guitard00d
  • 10/15/07
  • Sat, 11/17/2007 - 06:07
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Why add the "idebus=66" kernel boot parameters? What is the benefit to this?

P is for performance

  • saghaulor
  • 08/06/07
  • Thu, 09/13/2007 - 19:51
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Thank you Tim for reminding me how to turn ACPI on/off. Ladies and Gentlemen, I suspect we're all gentlemen here however, I have an announcement to make. Be sure you have ACPI enabled or else you will suffer incredible performance loss. As mentioned in a few other threads, I was having latency and xrun issues, on a fairly robust laptop. The best stable performance I could get from Jack was 64ms latency, with the following settings: 48000 sample rate, 2056 frames, and 3 periods Now, after having enabled ACPI, I have Jack reporting a 2.xms latency with the following settings: 48000 sample rate, 64 frames, and 2 periods I ran Ardour, then I loaded Jamin, (if you've read my previous posts Jamin was a hugs xrun problem for me) and I let them run for a few minutes, no errors, nothing, just pure performance. So, all this to say, if you want the most out of your hardware, be sure to have ACPI=ON in your boot loader. Also, this is the first time I've booted the kernel with ACPI, so it took some time to boot. Normally, meaning, when ACPI was off, my kernel would boot in one minute, perhaps a minute in a half tops. This time with ACPI on it took a bit longer. I'm not sure if this was from ACPI configuring for the first time or if it normally loads a bit longer. Either way, I'll gladly take a little boot time lag in order to get exponentially faster realtime performance.

add acpi=off to the kernel

  • Tim
  • 05/22/07
  • Wed, 09/12/2007 - 14:59
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add acpi=off to the kernel line in /boot/grub/menu.lst thus: --- title 64 Studio, kernel 2.6.22-1-multimedia-486 root (hd0,1) kernel /boot/vmlinuz-2.6.22-1-multimedia-486 root=/dev/hdb2 ro acpi=off idebus=66 initrd /boot/initrd.img-2.6.22-1-multimedia-486 savedefault --- cheers, tim /|\