[LAU] midi triggering delay

[andy baxter]

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 at monkey:~$ 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 at monkey:~$ 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 at monkey:~$ 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)