[linux-audio-user] Real-time kernel

Atte André Jensen atte.jensen at gmail.com
Thu Nov 30 05:43:54 EST 2006

Hartmut Noack wrote:

> 1.) if the IRQ-script shall work, you must have your soundcard set
> excluselively to an IRQ by using the BIOS-Setup, especially, if your
> Sounddevice shares an IRQ with an active Harddrive, you will get xruns
> even if you let Paul Davis himself set up you software for RT ;-)

I'm on an IBM T41 laptop, questions:

1) It seems my IRQ's are suboptimal:

atte at ajstrup:~$ lspci | grep -i audio
00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM 
(ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 01)

atte at ajstrup:~$ cat /proc/interrupts
   0:   10546861  XT-PIC         [........N/  0]-level    timer
   1:      37026  XT-PIC         [........./  2]-level    i8042
   2:          0  XT-PIC         [........N/  0]-level    cascade
   7:          0  XT-PIC         [........./  0]-level    parport0
   8:          4  XT-PIC         [........./  0]-level    rtc
   9:    1560538  XT-PIC         [........./  0]-level    acpi
  11:    1052364  XT-PIC         [........./  0]-level    ehci_hcd:usb1, 
uhci_hcd:usb2, uhci_hcd:usb3, uhci_hcd:usb4, Intel 82801DB-ICH4, yenta, 
yenta, wifi0, radeon at pci:0000:01:00.0
  12:     211280  XT-PIC         [........./  0]-level    i8042
  14:      20481  XT-PIC         [........./  0]-level    ide0
  15:         63  XT-PIC         [........./  0]-level    ide1
NMI:          0
LOC:          0
ERR:          0
MIS:          0

How do I change the IRQ of my sound card (Intel 82801DB-ICH4)? In the 
bios? I suffer from bios-fobia, so if "yes" anyone knows if it's 
possible on a T41 and if so could give a quick help?

2) If not possible, what would be the next-best solution?

3) I also have an usb soundcard. If possible should usb be put on a 
seperate IRQ also for this to perform the best?

peace, love & harmony

http://www.atte.dk      | quintet:      http://www.anagrammer.dk
                         | compositions: http://www.atte.dk/compositions

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