Ivan Z. Ganza wrote: >Hmmm, this is interesting... > >I have a similar problem. Two videocards here, NVIDIA GeForce4 and a >Matrox MGA400 (Dual Head) on a gentoo system. XFree 4.3.0 and Alsa >0.9.2. Kernel has low-latency enabled. > >If I enable the other videocard in XF86Config (simply by adding a >screen section for it), when I get into X, ANY sound will have major >clipping problems, and eventually my machine will TOTALLY LOCK, >leaving the only way to save it to pull the frigging plug out the >back. This is extremely frustrating. Even more frustrating is that >things actually work just fine under WindowsXP, this is so wrong. >(Although games do get a tiny bit of clipping once in a while). > >When the other video card is not used things work just perfectly! > >Have read many suggestions on net about this. Seems one possible >solution is the soundcard needs to be on a low IRQ such as 9, however, >no matter what I do (even moving card physically) its always sharing >an IRQ with something. Right now the NVIDIA card and the Sound card >are sharing the same IRQ, how braindead is this? > >Any clues would be much appreciated. Its been a long time since I had >actually mess with the damn hardware. > >Does enabling APIC-IO in the kernel make any difference? Don't even >know if my processer has APIC support. > >I mean this has got to work, if it can work fine under winblows, then >I'm assuming there has got to be a way. > >Thanks >-Ivan/ > >------- > > > > > >root@durhamel iganza # cat /proc/pci >PCI devices found: > Bus 0, device 0, function 0: > Host bridge: Intel Corp. 82850 850 (Tehama) Chipset Host Bridge (MCH) (rev 2). > Prefetchable 32 bit memory at 0xd8000000 [0xdfffffff]. > Bus 0, device 1, function 0: > PCI bridge: Intel Corp. 82850 850 (Tehama) Chipset AGP Bridge (rev 2). > Master Capable. Latency=64. Min Gnt=14. > Bus 0, device 30, function 0: > PCI bridge: Intel Corp. 82801BA/CA/DB PCI Bridge (rev 2). > Master Capable. No bursts. Min Gnt=6. > Bus 0, device 31, function 0: > ISA bridge: Intel Corp. 82801BA ISA Bridge (LPC) (rev 2). > Bus 0, device 31, function 1: > IDE interface: Intel Corp. 82801BA IDE U100 (rev 2). > I/O at 0xffa0 [0xffaf]. > Bus 0, device 31, function 2: > USB Controller: Intel Corp. 82801BA/BAM USB (Hub #1) (rev 2). > IRQ 12. > I/O at 0xff80 [0xff9f]. > Bus 0, device 31, function 3: > SMBus: Intel Corp. 82801BA/BAM SMBus (rev 2). > IRQ 11. > I/O at 0xdcd0 [0xdcdf]. > Bus 0, device 31, function 4: > USB Controller: Intel Corp. 82801BA/BAM USB (Hub #2) (rev 2). > IRQ 10. > I/O at 0xff60 [0xff7f]. > Bus 1, device 0, function 0: > VGA compatible controller: nVidia Corporation NV25 (GeForce 4) (rev 163). > IRQ 9. > Master Capable. Latency=248. Min Gnt=5.Max Lat=1. > Non-prefetchable 32 bit memory at 0xfd000000 [0xfdffffff]. > Prefetchable 32 bit memory at 0xe8000000 [0xefffffff]. > Prefetchable 32 bit memory at 0xe7f80000 [0xe7ffffff]. > Bus 2, device 10, function 0: > PCI bridge: Hint Corp HB1-SE33 PCI-PCI Bridge (rev 18). > Master Capable. Latency=64. Min Gnt=6. > Bus 2, device 11, function 0: > Multimedia audio controller: Creative Labs SB Audigy (rev 3). > IRQ 9. > Master Capable. Latency=64. Min Gnt=2.Max Lat=20. > I/O at 0xece0 [0xecff]. > Bus 2, device 11, function 1: > Input device controller: Creative Labs SB Audigy MIDI/Game port (rev 3). > Master Capable. Latency=64. > I/O at 0xecd8 [0xecdf]. > Bus 2, device 11, function 2: > FireWire (IEEE 1394): Creative Labs SB Audigy FireWire Port (rev 0). > IRQ 11. > Master Capable. Latency=64. Min Gnt=2.Max Lat=4. > Non-prefetchable 32 bit memory at 0xf9fff800 [0xf9ffffff]. > Non-prefetchable 32 bit memory at 0xf9ff8000 [0xf9ffbfff]. > Bus 2, device 12, function 0: > Ethernet controller: 3Com Corporation 3c905C-TX/TX-M [Tornado] (rev 120). > IRQ 5. > Master Capable. Latency=64. Min Gnt=10.Max Lat=10. > I/O at 0xec00 [0xec7f]. > Non-prefetchable 32 bit memory at 0xf9fff400 [0xf9fff47f]. > Bus 3, device 0, function 0: > VGA compatible controller: Matrox Graphics, Inc. MGA G400 AGP (rev 133). > IRQ 12. > Master Capable. Latency=64. Min Gnt=16.Max Lat=32. > Prefetchable 32 bit memory at 0xf0000000 [0xf1ffffff]. > Non-prefetchable 32 bit memory at 0xfbffc000 [0xfbffffff]. > Non-prefetchable 32 bit memory at 0xfb000000 [0xfb7fffff]. > > >"Jack O'Quin" <joq@xxxxxx> writes: > > > >>Arthur Moore <art@xxxxxxxxxxxxxxx> writes: >> >> >> >>>I'm using xinerama with two nvidia cards and I'm having a problem when >>>trying to play sound. When I stretch an app (like audacity) over two >>>screens I get all sorts of distortions. Actually whenever any sound >>>app is on the second screen I have problems. Like a clicking. Anyway >>>I'm using Debian unstable, with kernel 2.4.20 (no patches), Xfree86 >>>4.2.1, and alsa 0.9.2. Anyone else seen this problem? >>> >>> >>It works OK for me. I'm running Debian woody (stable), homemade >>kernel 2.4.19 with lowlatency and capability patches, XFree86 4.1.0, >>GNOME 1.4 and ALSA 0.9.0rc7-2 with xinerama on a Matrox G400. Sound >>card is an M-Audio Delta 66 (very good card for the money). >> >>The first thing I'd suspect is the NVIDIA cards. Some models are >>reputed to have poor latency characteristics. Google for information >>on what the problems are and what to do. >> >>You may want to try building a low-latency kernel, too. Debian has a >>package for it that you can install and include in the kernel build >>with make-kpkg. If you're going to do all that, I'd recommend making >>the capability patch, also. It's only two lines, and it makes JACK >>far more usable. >> >>Regards, >>-- >> Jack O'Quin >> >> My soundcard and Nvidia card are also sharing the same irq. I tried to move the card to keep that from happening, but it doesn't seem like that is working. Can't you manually assign IRQ's to a device? how would one go about doing that? Art
