[13:48] <fred1807> ubuntustudio
[13:48] <fred1807> how do I specify my "ladcomp" alsa plugin, as MPD output, in mpd.conf?  device          "hw:0,0"
[16:42] <Adro> Hello everybody, I'm having problems with my new Presonus 1818vsl audio interface,  there's poping and crackling sounds, if jack manages to start I get a lot of xruns... I've been looking around for solutions and I suspect it might be related to a usb3 issue, I think I managed to disable usb3 through my BIOS setup, but nothing seems to change... sorry guys but I'm desperate for help!!!
[16:46] <Adro> running ubuntu studio 16.04lts
[17:22] <OvenWerks> Adro: you may need to get a pcie USB card. The intel USB ports do have issues.
[17:23] <Adro> hi
[17:23] <Adro> I'll check that OvenWerks , I think there might be some extra ports in my motherboard
[17:23] <OvenWerks> Adro: first try each USB port on your computer though, it may just be the usb port you are using shares irq with something else
[17:24] <Adro> that I know it is an issue in my system
[17:25] <OvenWerks> Adro: you may be interested in http://crimeandtheforcesofevil.com/blog/2016/07/24/usb-2-0-chipsets-digital-audio-workstations-and-linux/
[17:25] <OvenWerks> and it's follow up article.
[17:25] <Adro> OvenWerks: I did some research in that subject but it gets really confusing, I know I have both usb3 and usb2 hubs but can't understand how are they routed to the actual ports
[17:26] <OvenWerks> http://crimeandtheforcesofevil.com/blog/2016/07/25/so-hey-usb-chipsets-totally-matter/
[17:26] <Adro> OvenWerks: thank you so much
[17:26] <OvenWerks> is the second one. It turns out to be the usb 1.1 part of the intel chipset that is the problem
[17:27] <OvenWerks> USB 2.0 uses some of the usb1.1 stuff and the intel chipset expects the system cpu to do a lot more of the work which means many more interupts
[21:38] <adro_> hello all, xhci-hcd seems to control all my usb buses even if they are 2.0, I'm  having issues with a usb audio interface Presonus 1818vsl, this does not work well with usb3, I have learn that installing a PCI card with ohci-hcd drivers would solve it but, is there a reason why I can't force xhci to manage only my usb3 ports??? help and thanks for any insight!!!
[21:44] <adro_> sorry OvenWerks , thanks for the links, I gathered some info about this and it raised more questions! I just asked again this time why xhci seems to be controlling all my buses... I don't understand why lsusb lists 4 buses and all my devices are managed under one that's not even the 3.0 hub but the driver is xhci... sorry to bother you but I'm just confused, I consider getting a pci card but now I need to understand this issue
[21:46] <OvenWerks> adro_: the USB 1.1 part of things is traffic control. If you have xhci on all of them, it is because of the USB chipset in use. (probably Intel)
[21:49] <adro_> OvenWerks: yes, the chipset is 8 Series/C220 Series
[21:50] <OvenWerks> adro_: have you edited your rtinit file yet?
[21:51] <adro_> OvenWerks: but I don't get it why apparently having 3 controllers of which only one is xhci it has to manage all...
[21:51] <adro_> OvenWerks: nope
[21:51] <OvenWerks> adro_: the way I have dealt with that is first find out if the port you are using shares irqs with something else
[21:52] <adro_> OvenWerks: you'll have to excuse me for I'm quite a newbi
[21:52] <OvenWerks> Do you know which USB the 1818 is plugged into?
[21:52] <adro_> OvenWerks: oh yes, I think all my buses are in just 2 slots
[21:53] <adro_> OvenWerks: yes, that's the thing
[21:53] <OvenWerks> ok. in a terminal type cat/proc/interrupts
[21:54] <adro_> OvenWerks: yes I've got it
[21:54] <OvenWerks> use shift uparoow to get back up to where the usb ports are listed.
[21:54] <adro_> OvenWerks: 16 and 23 are for ehci and 26 seems to be xhci
[21:55] <OvenWerks> adro_: you want to A) make sure you are using the one on 23 (16 is almost always shared) and B) make sure nothing else is using that USB port.
[21:55] <OvenWerks> That is no mouse/kb etc.
[21:56] <OvenWerks> (mouse generates a lot of interupts)
[21:57] <adro_> OvenWerks: the issue is no matter where I plug what everything is under the same bus
[21:59] <OvenWerks> You are begining to see why another USB card would be helpful :(
[22:01] <OvenWerks> On my netbook (several years old now) there were two ports in use (USB2 and 3) I was able to get only my sound device on USB3 and then raise the priority on just that USB port.
[22:01] <OvenWerks> I used USB2 for everything else (hard drive and mouse as happens)
[22:01] <adro_> OvenWerks: that's where I get confused, since my motherboard has 4 usb3 ports and 8 usb2 ports i just don't get it
[22:03] <OvenWerks> Ya, I think things have changed since USB3 came out.
[22:03] <adro_> OvenWerks: where can I find the rtinit file?
[22:04] <OvenWerks> /etc/default/rtirq it is rtirq I guess I had it wrong
[22:04] <OvenWerks> it is a system file so sudo nano to edit.
[22:04] <adro_> OvenWerks: yes, I see why a pci card would help, but then I gathered that there might be an issue with a my 64 bit system
[22:05] <OvenWerks> why?
[22:07] <adro_> OvenWerks: says... it requires an IOMMU or a computationally expensive bounce buffer to work with a 64-bit operating system
[22:07] <adro_> OvenWerks: I don't have a clue what that means really
[22:07] <OvenWerks> I got the idea pretty much any NEC USB pcie card would work.
[22:08] <OvenWerks> I have heard that even the NEC based USB3 cards work well
[22:09] <adro_> OvenWerks: but still, should I use that only for the audio interface?
[22:09] <OvenWerks> Personally, I still use an old Delta66 PCI card so I don't know.
[22:09] <adro_> OvenWerks: or means I can use usb3 devices on the same
[22:09] <OvenWerks> yes, I would use it just for the audio box
[22:10] <OvenWerks> I would use the ones on the MB for everything else
[22:10] <adro_> OvenWerks: yes, I was searching for that sort of pci interface but they are difficult to find!
[22:10] <OvenWerks> The Intel USB chips are fine for most uses
[22:10] <adro_> OvenWerks: ok
[22:11] <OvenWerks> https://www.newegg.ca/Product/Product.aspx?Item=N82E16815283031&cm_re=pcie_usb_card_NEC-_-15-283-031-_-Product
[22:11] <adro_> OvenWerks:  so the important ist it should have ohci drivers?
[22:12] <OvenWerks> https://www.newegg.ca/Product/Product.aspx?Item=9SIA7RD2WW9524&cm_re=pcie_usb_card_NEC-_-15-158-394-_-Product
[22:12] <OvenWerks> NEC is known to have good drivers
[22:12] <OvenWerks> The hardware determines the drivers
[22:13] <OvenWerks> The Kernel will load the right drivers for the card
[22:13] <adro_> OvenWerks: ok
[22:14] <adro_> OvenWerks: "Backward compatible with USB 1.1 & 2.0" that's the thing right?
[22:14] <OvenWerks> Ya, you need USB2.0 for the 1818
[22:15] <adro_> so, you recon that one specifically would work on my machine???
[22:15] <adro_> just any pcie with nec chipsets?
[22:16] <OvenWerks> If the card has two plugs and shows up as two ports, then you could use the other port for other uses.
[22:16] <OvenWerks> That is what I have heard. To be honest... unless I try it in my system, I don't know.
[22:17] <adro_> hmm ok
[22:17] <adro_> well, that article you sent me earlier gives hope!
[22:19] <OvenWerks> I remember a message in the LAU mailing list, but not when... it gave some other NEC chips known to work as well as the one in that article.
[22:21] <adro_> oh, I'll check for compatibility then
[22:26]  * OvenWerks has to go for a while