[LAU] midi triggering delay

Hi all,

I'm trying to get my usb midi keyboard (an edirol PCR 800) working with
my good laptop (a 1400 MHz core 2 thinkpad X61s). I have jackd running
with 8 msec latency and no xruns using an onboard intel HDA sound card.
When I hook up qsynth (fluidsynth) to the keyboard's alsa midi output,
the notes are triggered with a slight (<0.1s?), and variable time delay.
Sometimes the note plays immediately on pressing the key; sometimes
there is a noticeable delay. This does not happen when I use the same
setup on my old laptop (a 1400 Mhz single core dell).

The OS is debian testing at the moment, but I have had the same problem
on this laptop with both ubuntu jaunty and a fairly recent version of
linux mint.

Does anyone have any idea what might be happening, or what I can do to
narrow down the cause of the problem a bit further?

My /proc/interrupts, lsusb, and lspci are pasted below.

Cheers,

andy baxter

andy@email-addr-hidden:~$ cat /proc/interrupts
           CPU0 CPU1
  0: 1207873 1669765 IO-APIC-edge timer
  1: 2473 1983 IO-APIC-edge i8042
  8: 1 0 IO-APIC-edge rtc0
  9: 19517 11123 IO-APIC-fasteoi acpi
 12: 25255 22957 IO-APIC-edge i8042
 14: 0 0 IO-APIC-edge ide0
 16: 380396 233180 IO-APIC-fasteoi uhci_hcd:usb4, yenta
 17: 829711 532117 IO-APIC-fasteoi uhci_hcd:usb5, ohci1394,
HDA Intel
 18: 0 0 IO-APIC-fasteoi mmc0
 19: 2 0 IO-APIC-fasteoi ehci_hcd:usb6
 20: 18 17 IO-APIC-fasteoi uhci_hcd:usb1
 21: 0 0 IO-APIC-fasteoi uhci_hcd:usb2
 22: 305246 302929 IO-APIC-fasteoi ehci_hcd:usb3
220: 8566 7543 PCI-MSI-edge eth0
221: 27049 24430 PCI-MSI-edge ahci
NMI: 0 0 Non-maskable interrupts
LOC: 426040 660568 Local timer interrupts
RES: 2036860 2297232 Rescheduling interrupts
CAL: 7278 7718 function call interrupts
TLB: 14422 14326 TLB shootdowns
TRM: 0 0 Thermal event interrupts
SPU: 0 0 Spurious interrupts
ERR: 0
MIS: 0

andy@email-addr-hidden:~$ lsusb
Bus 001 Device 003: ID 0483:2016 SGS Thomson Microelectronics
Fingerprint Reader
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 002: ID 0582:0033 Roland Corp. EDIROL PCR
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 003: ID 07ab:fcdf Freecom Technologies
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

andy@email-addr-hidden:~$ lspci
00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory
Controller Hub (rev 0c)
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960
Integrated Graphics Controller (rev 0c)
00:02.1 Display controller: Intel Corporation Mobile GM965/GL960
Integrated Graphics Controller (rev 0c)
00:19.0 Ethernet controller: Intel Corporation 82566MM Gigabit Network
Connection (rev 03)
00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI
Controller #4 (rev 03)
00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI
Controller #5 (rev 03)
00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI
Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio
Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express
Port 1 (rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express
Port 2 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI
Controller #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI
Controller #2 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI
Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev f3)
00:1f.0 ISA bridge: Intel Corporation 82801HBM (ICH8M-E) LPC Interface
Controller (rev 03)
00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E)
IDE Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E)
SATA AHCI Controller (rev 03)
00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller
(rev 03)
03:00.0 Network controller: Intel Corporation PRO/Wireless 4965 AG or
AGN [Kedron] Network Connection (rev 61)
05:00.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev ba)
05:00.1 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller
(rev 04)
05:00.2 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro
Host Adapter (rev 21)

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Received on Tue Sep 8 04:15:03 2009