Linux-audio-dev

linux-audio-dev@lists.linuxaudio.org

7516 discussions

[linux-audio-dev] Re: Need tips to get OSS midi configured

by airplays55＠yahoo.com

Thanks for the responses - the reason I didn't give more details is mainly because I don't know where to begin troubleshooting. Firstly let me explain why I need this to work on knoppix. I boot knoppix from a customized image on a compact flash card, so I've been able to add and customize a lot of software, and it runs all sorts of things for me like a webserver, proxy, browser, etc etc. I have a dedicated computer at my house that is always running knoppix (without harddrive) which is always on since there is no harddrive to eventually crash. For my serious audio work I have another computer that runs midi software I've been using since the late 80's (Dr. T's) in an Atari ST emulator, and this system does everything I need for now. Although I've been dabbling with Agnula and ALSA (with no luck yet), I still need to get the knoppix system working with rosegarden2 so that we will have a midi scratchpad to save song ideas with, to be later imported into a different system with rosegarden4 or cakewalk sonar or whatever. OK here are some details on my system. The computer is a gateway P2/266, and I have three soundcards (and a usb interface) that I've tried booting with, but knoppix doesn't autoconfigure the midi ports on any of them, although knoppix is able to identify and configure the audio portion of the soundcards. My hunch is that I should be able to manually get the midi portion to be recognized if I knew what to do. The soundcards I've tried are 1) a digital research ESS1869 ISA card, 2) an AVANCE LOGIC als-100 ISA card, 3) yamaha YMF-724 PCI card, and 4) a midiman midisport 1x1 USB interface. When I run rosegarden2 (that comes included in knoppix), the midi setup has /dev/null as the midi device. If I change it to /dev/midi, or /dev/sequencer, it says "device invalid or busy" when I run sndconfig with the yamaha pci card installed, it says "the yamaha corp ymf-724 (pci) is not currently supported" although I still hear audio through the wav output. when I run sndconfig with the ESS1869 ISA card installed, it says "no PnP or PCI soundcards were found - choose from list" then I choose "ESS1868 audiodrive" from the list, then I get a segmentation fault. I checked my /etc/modules.conf - I don't see an entry "snd-seq-oss", but the top of the file says run "update-modules" instead of editing modules.conf directly. So thats where I am now; I don't know what modules I need loaded (snd-seq-oss?) and I don't know where to find or how to add modules (yet). What can I try next? Any tips will be much appreciated! __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

20 years, 10 months

[linux-audio-dev] UPnP AV Media Server for Linux ?

by Andreas Kuckartz

UPnP (http://upnp.org) seems to have been adopted by many/most producers of audio streaming devices. I am looking for Open Source Media Server software for Linux which is accessable by UPnP AV Media Renderers. Any suggestions? Interesting material which I have found so far: Overview of UPnP AV Architecture http://www.intel.com/technology/upnp/download/UPnP_AV_Arch.pdf Linux SDK for UPnP Devices 1.2.1 (libupnp) http://upnp.sourceforge.net/ LINUX UPNP INTERNET GATEWAY DEVICE http://linux-igd.sourceforge.net/ CyberLink / CyberMediaGateway http://www.cybergarage.org/net/index.html Intel(R) software for UPnP technology http://www.intel.com/technology/upnp/index.htm Cheers, Andreas

20 years, 10 months

[linux-audio-dev] need tips to get OSS midi configured

by airplays55＠yahoo.com

I am in desperate need of advice! I don't know if this post is appropriate here but for months I have been seeking info from different linux audio forums/lists, and have gotten nowhere. I have a knoppix installation that includes rosegarden2 and OSS drivers and am trying to get OSS to recognize the midiports. The midiports are not recognized upon bootup. How can I configure/check the midi port configuration for the OSS drivers? Yes I know that rosegarden4 blows away rosegarden2, and ALSA is the way to go, but since knoppix includes rosegarden2 and OSS, I think it would be easier for me to get this working than switch to ALSA and new software. I have tried several midi interfaces/soundcards which I know are supposed to work (ISA, PCI, and USB) Any advice would be much appreciated! __________________________________ Do you Yahoo!? Meet the all-new My Yahoo! - Try it today! http://my.yahoo.com

20 years, 10 months

[linux-audio-dev] 2.6.10-ck1 & hdsp problem

by Tim Blechmann

hi all ... i can't get my hdsp working on the latest ck-patched kernel ... it doesn't appear in the lspci output ... 2.6.9-ck3 worked flawless .. the dmesg output is: Linux version 2.6.10-ck1 (root@laptop) (gcc version 3.4.3 20041125 (Gentoo Linux 3.4.3-r1, ssp-3.4.3-0, pie-8.7.7)) #1 Mon Dec 27 17:37:54 CET 2004 BIOS-provided physical RAM map: BIOS-e820: 0000000000000000 - 000000000009f000 (usable) BIOS-e820: 000000000009f000 - 00000000000a0000 (reserved) BIOS-e820: 00000000000dc000 - 00000000000e0000 (reserved) BIOS-e820: 00000000000e4000 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 000000001fef0000 (usable) BIOS-e820: 000000001fef0000 - 000000001feff000 (ACPI data) BIOS-e820: 000000001feff000 - 000000001ff00000 (ACPI NVS) BIOS-e820: 000000001ff00000 - 000000001ff80000 (usable) BIOS-e820: 000000001ff80000 - 0000000020000000 (reserved) BIOS-e820: 00000000ff800000 - 00000000ffc00000 (reserved) BIOS-e820: 00000000fff00000 - 0000000100000000 (reserved) 511MB LOWMEM available. On node 0 totalpages: 130944 DMA zone: 4096 pages, LIFO batch:1 Normal zone: 126848 pages, LIFO batch:16 HighMem zone: 0 pages, LIFO batch:1 DMI present. ACPI: RSDP (v000 TOSCPL ) @ 0x000f6db0 ACPI: RSDT (v001 TOSCPL RSDT 0x06040000 LTP 0x00000000) @ 0x1fefacc1 ACPI: FADT (v001 TOSCPL BR20 0x06040000 PTL 0x00000001) @ 0x1fefef64 ACPI: BOOT (v001 TOSCPL $SBFTBL$ 0x06040000 LTP 0x00000001) @ 0x1fefefd8 ACPI: DSDT (v001 COMPAL BR20 0x06040000 MSFT 0x0100000d) @ 0x00000000 Built 1 zonelists Kernel command line: root=/dev/ram0 real_root=/dev/hda1 init=/linuxrc resume=/dev/hda2 #vga=0x317 splash=verbose Local APIC disabled by BIOS -- you can enable it with "lapic" mapped APIC to ffffd000 (01405000) Initializing CPU#0 PID hash table entries: 2048 (order: 11, 32768 bytes) Detected 2492.541 MHz processor. Using tsc for high-res timesource Console: colour dummy device 80x25 Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) Memory: 512408k/523776k available (3064k kernel code, 10704k reserved, 932k data, 188k init, 0k highmem) Checking if this processor honours the WP bit even in supervisor mode... Ok. Calibrating delay loop... 4915.20 BogoMIPS (lpj=2457600) Mount-cache hash table entries: 512 (order: 0, 4096 bytes) CPU: After generic identify, caps: bfebf9ff 00000000 00000000 00000000 CPU: After vendor identify, caps: bfebf9ff 00000000 00000000 00000000 CPU: Trace cache: 12K uops, L1 D cache: 8K CPU: L2 cache: 512K CPU: After all inits, caps: bfebf9ff 00000000 00000000 00000080 Intel machine check architecture supported. Intel machine check reporting enabled on CPU#0. CPU0: Intel P4/Xeon Extended MCE MSRs (12) available CPU0: Thermal monitoring enabled CPU: Intel(R) Pentium(R) 4 CPU 2.50GHz stepping 07 Enabling fast FPU save and restore... done. Enabling unmasked SIMD FPU exception support... done. Checking 'hlt' instruction... OK. ACPI: setting ELCR to 0200 (from 0820) checking if image is initramfs...it isn't (no cpio magic); looks like an initrd Freeing initrd memory: 1347k freed NET: Registered protocol family 16 PCI: PCI BIOS revision 2.10 entry at 0xfd9a0, last bus=2 PCI: Using configuration type 1 mtrr: v2.0 (20020519) ACPI: Subsystem revision 20041105 ACPI: Interpreter enabled ACPI: Using PIC for interrupt routing ACPI: PCI Root Bridge [PCI0] (00:00) PCI: Probing PCI hardware (bus 00) PCI: Transparent bridge - 0000:00:1e.0 ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.AGP_._PRT] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.SLOT._PRT] ACPI: PCI Interrupt Link [LNKA] (IRQs *5) ACPI: PCI Interrupt Link [LNKB] (IRQs *11) ACPI: PCI Interrupt Link [LNKC] (IRQs 11) *0, disabled. ACPI: PCI Interrupt Link [LNKD] (IRQs *5) ACPI: PCI Interrupt Link [LNKE] (IRQs *11) ACPI: PCI Interrupt Link [LNKH] (IRQs 5) *11 ACPI: Embedded Controller [EC0] (gpe 28) Linux Plug and Play Support v0.97 (c) Adam Belay pnp: PnP ACPI init pnp: PnP ACPI: found 10 devices SCSI subsystem initialized PCI: Using ACPI for IRQ routing ** PCI interrupts are no longer routed automatically. If this ** causes a device to stop working, it is probably because the ** driver failed to call pci_enable_device(). As a temporary ** workaround, the "pci=routeirq" argument restores the old ** behavior. If this argument makes the device work again, ** please email the output of "lspci" to bjorn.helgaas(a)hp.com ** so I can fix the driver. pnp: 00:00: ioport range 0xfe00-0xfe01 has been reserved Simple Boot Flag at 0x36 set to 0x1 Machine check exception polling timer started. apm: BIOS version 1.2 Flags 0x03 (Driver version 1.16ac) apm: overridden by ACPI. devfs: 2004-01-31 Richard Gooch (rgooch(a)atnf.csiro.au) devfs: boot_options: 0x0 Installing knfsd (copyright (C) 1996 okir(a)monad.swb.de). SGI XFS with large block numbers, no debug enabled Initializing Cryptographic API vesafb: framebuffer at 0xf0000000, mapped to 0xe0880000, using 3072k, total 32768k vesafb: mode is 1024x768x16, linelength=2048, pages=20 vesafb: protected mode interface info at c000:5215 vesafb: scrolling: redraw vesafb: Truecolor: size=0:5:6:5, shift=0:11:5:0 Console: switching to colour frame buffer device 128x48 fb0: VESA VGA frame buffer device ACPI: AC Adapter [ACAD] (on-line) ACPI: Battery Slot [BAT1] (battery present) ACPI: Power Button (FF) [PWRF] ACPI: Lid Switch [LID] ACPI: Processor [CPU0] (supports C1 C2) Real Time Clock Driver v1.12 Non-volatile memory driver v1.2 hw_random: RNG not detected i8042.c: Detected active multiplexing controller, rev 1.1. serio: i8042 AUX0 port at 0x60,0x64 irq 12 serio: i8042 AUX1 port at 0x60,0x64 irq 12 serio: i8042 AUX2 port at 0x60,0x64 irq 12 serio: i8042 AUX3 port at 0x60,0x64 irq 12 serio: i8042 KBD port at 0x60,0x64 irq 1 Serial: 8250/16550 driver $Revision: 1.90 $ 8 ports, IRQ sharing disabled ACPI: PCI Interrupt Link [LNKB] enabled at IRQ 11 PCI: setting IRQ 11 as level-triggered ACPI: PCI interrupt 0000:00:1f.6[B] -> GSI 11 (level, low) -> IRQ 11 io scheduler noop registered io scheduler anticipatory registered io scheduler deadline registered io scheduler cfq registered elevator: using cfq as default io scheduler Floppy drive(s): fd0 is 1.44M FDC 0 is a post-1991 82077 RAMDISK driver initialized: 16 RAM disks of 8192K size 1024 blocksize loop: loaded (max 8 devices) Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2 ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx ICH2: IDE controller at PCI slot 0000:00:1f.1 ICH2: chipset revision 5 ICH2: not 100% native mode: will probe irqs later ide0: BM-DMA at 0x1800-0x1807, BIOS settings: hda:DMA, hdb:pio ide1: BM-DMA at 0x1808-0x180f, BIOS settings: hdc:DMA, hdd:pio Probing IDE interface ide0... hda: TOSHIBA MK3018GAP, ATA DISK drive ide0 at 0x1f0-0x1f7,0x3f6 on irq 14 Probing IDE interface ide1... hdc: DW-224E, ATAPI CD/DVD-ROM drive ide1 at 0x170-0x177,0x376 on irq 15 Probing IDE interface ide2... ide2: Wait for ready failed before probe ! Probing IDE interface ide3... ide3: Wait for ready failed before probe ! Probing IDE interface ide4... ide4: Wait for ready failed before probe ! Probing IDE interface ide5... ide5: Wait for ready failed before probe ! hda: max request size: 128KiB hda: 58605120 sectors (30005 MB), CHS=58140/16/63, UDMA(100) hda: cache flushes supported /dev/ide/host0/bus0/target0/lun0: p1 p2 p3 hdc: ATAPI 24X DVD-ROM CD-R/RW drive, 1658kB Cache, UDMA(33) Uniform CD-ROM driver Revision: 3.20 st: Version 20041025, fixed bufsize 32768, s/g segs 256 mice: PS/2 mouse device common for all mice input: AT Translated Set 2 keyboard on isa0060/serio0 input: PS/2 Generic Mouse on isa0060/serio4 NET: Registered protocol family 2 IP: routing cache hash table of 4096 buckets, 32Kbytes TCP: Hash tables configured (established 32768 bind 65536) NET: Registered protocol family 1 NET: Registered protocol family 17 p4-clockmod: P4/Xeon(TM) CPU On-Demand Clock Modulation available ACPI wakeup devices: PWBN RTLN USB1 USB2 AC97 ACPI: (supports S0 S3 S4 S5) RAMDISK: Compressed image found at block 0 VFS: Mounted root (ext2 filesystem) readonly. Freeing unused kernel memory: 188k freed usbcore: registered new driver usbfs usbcore: registered new driver hub usbcore: registered new driver hiddev usbcore: registered new driver usbhid drivers/usb/input/hid-core.c: v2.0:USB HID core driver Initializing USB Mass Storage driver... usbcore: registered new driver usb-storage USB Mass Storage support registered. USB Universal Host Controller Interface driver v2.2 ACPI: PCI Interrupt Link [LNKD] enabled at IRQ 5 PCI: setting IRQ 5 as level-triggered ACPI: PCI interrupt 0000:00:1f.2[D] -> GSI 5 (level, low) -> IRQ 5 uhci_hcd 0000:00:1f.2: Intel Corp. 82801BA/BAM USB (Hub #1) PCI: Setting latency timer of device 0000:00:1f.2 to 64 uhci_hcd 0000:00:1f.2: irq 5, io base 0x1820 uhci_hcd 0000:00:1f.2: new USB bus registered, assigned bus number 1 hub 1-0:1.0: USB hub found hub 1-0:1.0: 2 ports detected ACPI: PCI Interrupt Link [LNKH] enabled at IRQ 5 ACPI: PCI interrupt 0000:00:1f.4[C] -> GSI 5 (level, low) -> IRQ 5 uhci_hcd 0000:00:1f.4: Intel Corp. 82801BA/BAM USB (Hub #2) PCI: Setting latency timer of device 0000:00:1f.4 to 64 uhci_hcd 0000:00:1f.4: irq 5, io base 0x1840 uhci_hcd 0000:00:1f.4: new USB bus registered, assigned bus number 2 hub 2-0:1.0: USB hub found hub 2-0:1.0: 2 ports detected ohci_hcd: 2004 Nov 08 USB 1.1 'Open' Host Controller (OHCI) Driver (PCI) ReiserFS: hda1: found reiserfs format "3.6" with standard journal ReiserFS: hda1: using ordered data mode ReiserFS: hda1: journal params: device hda1, size 8192, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30 ReiserFS: hda1: checking transaction log (hda1) ReiserFS: hda1: Using r5 hash to sort names Adding 522104k swap on /dev/hda2. Priority:-1 extents:1 ReiserFS: hda3: found reiserfs format "3.6" with standard journal ReiserFS: hda3: using ordered data mode ReiserFS: hda3: journal params: device hda3, size 8192, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30 ReiserFS: hda3: checking transaction log (hda3) ReiserFS: hda3: Using r5 hash to sort names Linux agpgart interface v0.100 (c) Dave Jones agpgart: Detected an Intel i845 Chipset. agpgart: Maximum main memory to use for agp memory: 439M agpgart: AGP aperture is 64M @ 0xec000000 ACPI: PCI interrupt 0000:00:1f.5[B] -> GSI 11 (level, low) -> IRQ 11 PCI: Setting latency timer of device 0000:00:1f.5 to 64 intel8x0_measure_ac97_clock: measured 49454 usecs intel8x0: clocking to 48000 ACPI: PCI Interrupt Link [LNKA] enabled at IRQ 5 ACPI: PCI interrupt 0000:01:00.0[A] -> GSI 5 (level, low) -> IRQ 5 PCI: Unable to reserve mem region #1:8000000@f0000000 for device 0000:01:00.0 radeonfb: cannot reserve PCI regions. Someone already got them? radeonfb: probe of 0000:01:00.0 failed with error -16 e100: Intel(R) PRO/100 Network Driver, 3.2.3-k2-NAPI e100: Copyright(c) 1999-2004 Intel Corporation ACPI: PCI Interrupt Link [LNKE] enabled at IRQ 11 ACPI: PCI interrupt 0000:02:08.0[A] -> GSI 11 (level, low) -> IRQ 11 e100: eth0: e100_probe: addr 0xe8100000, irq 11, MAC addr 00:02:3F:B3:32:38 e100: eth0: e100_watchdog: link up, 100Mbps, full-duplex ACPI: PCI interrupt 0000:01:00.0[A] -> GSI 5 (level, low) -> IRQ 5[drm] Initialized radeon 1.11.0 20020828 on minor 0: ATI Technologies Inc Radeon Mobility M6 LY agpgart: Found an AGP 2.0 compliant device at 0000:00:00.0. agpgart: Putting AGP V2 device at 0000:00:00.0 into 1x mode agpgart: Putting AGP V2 device at 0000:01:00.0 into 1x mode it seems that something with the pci routing has changed, but pci=routeirq didn't change anything ... lspci is: 0000:00:00.0 Host bridge: Intel Corp. 82845 845 (Brookdale) Chipset Host Bridge (rev 04) 0000:00:01.0 PCI bridge: Intel Corp. 82845 845 (Brookdale) Chipset AGP Bridge (rev 04) 0000:00:1e.0 PCI bridge: Intel Corp. 82801BA/CA/DB PCI Bridge (rev 05) 0000:00:1f.0 ISA bridge: Intel Corp. 82801BA ISA Bridge (LPC) (rev 05) 0000:00:1f.1 IDE interface: Intel Corp. 82801BA IDE U100 (rev 05) 0000:00:1f.2 USB Controller: Intel Corp. 82801BA/BAM USB (Hub #1) (rev 05) 0000:00:1f.3 SMBus: Intel Corp. 82801BA/BAM SMBus (rev 05) 0000:00:1f.4 USB Controller: Intel Corp. 82801BA/BAM USB (Hub #2) (rev 05) 0000:00:1f.5 Multimedia audio controller: Intel Corp. 82801BA/BAM AC'97 Audio (rev 05) 0000:00:1f.6 Modem: Intel Corp. Intel 537 [82801BA/BAM AC'97 Modem] (rev 05) 0000:01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility M6 LY 0000:02:00.0 CardBus bridge: O2 Micro, Inc. OZ6933 Cardbus Controller (rev 01) 0000:02:00.1 CardBus bridge: O2 Micro, Inc. OZ6933 Cardbus Controller (rev 01) 0000:02:08.0 Ethernet controller: Intel Corp. 82801BA/BAM/CA/CAM Ethernet Controller (rev 03) the hdsp should be device no. 07:00.0 ... any idea? cheers ... tim -- mailto:TimBlechmann@gmx.de ICQ: 96771783 http://www.mokabar.tk After one look at this planet any visitor from outer space would say "I want to see the manager." William S. Burroughs

20 years, 10 months

[linux-audio-dev] LSM: Linux 2.6 Kernel Capability LSM Module Local Privilege Elevation

by Frank Barknecht

Hi, careful with the linux security module: As reported on Bugtraq, there's a vulnerability when loading LSM as a module instead of compiling it into the kernel: "When POSIX Capability LSM module isn't compiled into kernel, after inserting Capability module into kernel, all existed normal users processes will have total Capability privileges of superuser (root)." Read on here: http://www.derkeiler.com/Mailing-Lists/securityfocus/bugtraq/2004-12/0390.h… Ciao -- Frank Barknecht _ ______footils.org__

20 years, 10 months

[linux-audio-dev] GUS Patch Documentation

by Stefan Westerfeld

Hi! Is there somewhere useful documentation explaining how GUS Patches should sound? I am currently implementing support for GUS Patches for BEAST, and the documentation from wotsit.org for instance only explains that there ways to specify envelopes, tremolo and vibrato in GUS Patches, but not how the values specified there actually should sound (i.e. whats the meaning of a tremolo sweep value of 25?). The only method for getting this right I've come up with so far is trying to understand the timidity code... Cu... Stefan -- -* Stefan Westerfeld, stefan(a)space.twc.de (PGP!), Hamburg/Germany KDE Developer, project infos at http://space.twc.de/~stefan/kde *-

20 years, 10 months

[linux-audio-dev] 2.6.10-rc2-mm3 Hang

by Spencer Russell

It would seem that perhaps my hangup problems in 2.6 aren't necessarily related to my US428. I got the 2.6.10-rc2 sources, and applied the mm3, rt2(Realtime LSM), Ingo's realtime-preempt, and usx2y 0.8.7.1 patches. The kernel patched and compiled fine, but it hangs after several minutes of normal web usage. I could still ssh into it(after a while that stopped working, too), and top showed several IRQ # processes running, which is abnormal. I'm not sure what else to look for, or what this means, exactly. Any ideas? should I be posting this to a different list? Thanks a lot, spencer

20 years, 10 months

Re: [linux-audio-dev] Re: rosegarden, alsa_seq and usx2y

by Stefan Turner

Thanks Fons and Rui for replies, sorry this is so late, been off the net. The extra flags worked ok, but there's still problems which I guess are due to CCRMA using jack-audio-connection-kit instead of jack... but I can wait till the new usx2y is in alsa proper. (Thanks to all involved for this!) Out of interest, does anyone know how the performance compares to using the supplied drivers in Windows? (Not that I am thinking of going back, just wondering :) ) Stefan Turner ___________________________________________________________ ALL-NEW Yahoo! Messenger - all new features - even more fun! http://uk.messenger.yahoo.com

20 years, 10 months

[linux-audio-dev] Steinberg sold to Yamaha

by Dave Phillips

http://biz.yahoo.com/prnews/041221/sftu007_1.html "MOUNTAIN VIEW, Calif., Dec. 21 /PRNewswire-FirstCall/ -- Pinnacle Systems, Inc. (Nasdaq: PCLE <http://finance.yahoo.com/q?s=pcle&d=t> - News <http://finance.yahoo.com/q/h?s=pcle>), a leader in digital video solutions, today announced that it has entered into a definitive agreement to sell its Hamburg, Germany-based Steinberg audio software business to Yamaha Corporation. The transaction, which is subject to regulatory approval, is expected to be completed during Pinnacle's third fiscal quarter ended March 31, 2005."

20 years, 10 months

Re: [linux-audio-dev] Tascam US428 Continued hangups

by Spencer Russell

On Fri, Dec 24, 2004 at 12:05:07PM -0500, Rui Nuno Capela wrote: > > ... > device. It was probably this very one that was aunting you before. After > some attention and furious alsa-bugtracker exchange, Karten Wiese has been > able to solve this, even tought he's got no OHCI hardware near him. > I was watching that thread a little, because my symptoms were very similar. Strangely, though, I have a UHCI based card, so I'm not sure why I was seeing similar symtoms. > Then Karsten did it again. He crafted a special jackd alsa/usx2y backend > which enabled the so-called raw-usb mode of operation. And it was just > yesterday I have proposed the merge into the official alsa backend driver > on the jackit-devel list. With this new experimental stuff, one can run > jackd in realtime with pretty lowest-latency parameters, without aural > artifacts (i.e. crackling). AFAICT this is a greatest breakthrough on the > USB audio arena, so I would think twice about getting rid of your US428 ;) > I'm having a bit of trouble with the usx2y backend to jackd. I bastardized the jackd-us2xy rpm to make a nice deb file, but jackd still says "unknown driver 'usx2y'". Even downloading and compiling the source, and running it directly from the directory it ws compiled into. And does it automatically use the rawusb interface? What's the advantage of using the usx2y driver as opposed to the alsa driver? > So my recipe goes like this: > > 1. Have REALTIME_PREEMPT on the kernel config. > > 2. Make sure you have loaded the latest snd-usb-usx2y>=0.8.7.1 (as of > latest alsa-kernel cvs). > > 3. Tune the RT priorities (SCHED_FIFO) of the time-audio critical IRQ > threads: > 90 - timer (IRQ 0) > 80 - rtc (IRQ 8) > 70 - snd (or whatever your PCI soundcard will hook, usually IRQ 5) > 60 - usb (ohci_hcd or uhici_hcd, usually IRQ 10) > You should have schedutils installed (chrt) for this exercise. > > 4. Load the snd-usb-usx2y with the nrpacks parameter set for: > a. high-stability: nrpacks=4 > b. low-latency: nrpacks=1 > Anyway, be advised that you can only run the forementioned "rawusb" > mode if you set on this later one (modprobe snd-usb-usx2y nrpacks=1). > > Run your jackd command line (or qjackctl;) as usual, but given the above > priority tunning, you should try e.g. jackd -R -P60 ... > Thanks a lot for this detailed info! I recompiled the newest snd-usb-usx2y driver, but how do I tune RT priorities? I got the schedutils package, but I'm having trouble finding details on how to use chrt. Thanks again for the info. -spencer

20 years, 10 months

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Linux-audio-dev