[13:48] ubuntustudio [13:48] how do I specify my "ladcomp" alsa plugin, as MPD output, in mpd.conf? device "hw:0,0" [16:42] 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] running ubuntu studio 16.04lts [17:22] Adro: you may need to get a pcie USB card. The intel USB ports do have issues. [17:23] hi [17:23] I'll check that OvenWerks , I think there might be some extra ports in my motherboard [17:23] 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] that I know it is an issue in my system [17:25] Adro: you may be interested in http://crimeandtheforcesofevil.com/blog/2016/07/24/usb-2-0-chipsets-digital-audio-workstations-and-linux/ [17:25] and it's follow up article. [17:25] 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] http://crimeandtheforcesofevil.com/blog/2016/07/25/so-hey-usb-chipsets-totally-matter/ [17:26] OvenWerks: thank you so much [17:26] is the second one. It turns out to be the usb 1.1 part of the intel chipset that is the problem [17:27] 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] 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] 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] 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] OvenWerks: yes, the chipset is 8 Series/C220 Series [21:50] adro_: have you edited your rtinit file yet? [21:51] 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] OvenWerks: nope [21:51] 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] OvenWerks: you'll have to excuse me for I'm quite a newbi [21:52] Do you know which USB the 1818 is plugged into? [21:52] OvenWerks: oh yes, I think all my buses are in just 2 slots [21:53] OvenWerks: yes, that's the thing [21:53] ok. in a terminal type cat/proc/interrupts [21:54] OvenWerks: yes I've got it [21:54] use shift uparoow to get back up to where the usb ports are listed. [21:54] OvenWerks: 16 and 23 are for ehci and 26 seems to be xhci [21:55] 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] That is no mouse/kb etc. [21:56] (mouse generates a lot of interupts) [21:57] OvenWerks: the issue is no matter where I plug what everything is under the same bus [21:59] You are begining to see why another USB card would be helpful :( [22:01] 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] I used USB2 for everything else (hard drive and mouse as happens) [22:01] 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] Ya, I think things have changed since USB3 came out. [22:03] OvenWerks: where can I find the rtinit file? [22:04] /etc/default/rtirq it is rtirq I guess I had it wrong [22:04] it is a system file so sudo nano to edit. [22:04] 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] why? [22:07] OvenWerks: says... it requires an IOMMU or a computationally expensive bounce buffer to work with a 64-bit operating system [22:07] OvenWerks: I don't have a clue what that means really [22:07] I got the idea pretty much any NEC USB pcie card would work. [22:08] I have heard that even the NEC based USB3 cards work well [22:09] OvenWerks: but still, should I use that only for the audio interface? [22:09] Personally, I still use an old Delta66 PCI card so I don't know. [22:09] OvenWerks: or means I can use usb3 devices on the same [22:09] yes, I would use it just for the audio box [22:10] I would use the ones on the MB for everything else [22:10] OvenWerks: yes, I was searching for that sort of pci interface but they are difficult to find! [22:10] The Intel USB chips are fine for most uses [22:10] OvenWerks: ok [22:11] https://www.newegg.ca/Product/Product.aspx?Item=N82E16815283031&cm_re=pcie_usb_card_NEC-_-15-283-031-_-Product [22:11] OvenWerks: so the important ist it should have ohci drivers? [22:12] https://www.newegg.ca/Product/Product.aspx?Item=9SIA7RD2WW9524&cm_re=pcie_usb_card_NEC-_-15-158-394-_-Product [22:12] NEC is known to have good drivers [22:12] The hardware determines the drivers [22:13] The Kernel will load the right drivers for the card [22:13] OvenWerks: ok [22:14] OvenWerks: "Backward compatible with USB 1.1 & 2.0" that's the thing right? [22:14] Ya, you need USB2.0 for the 1818 [22:15] so, you recon that one specifically would work on my machine??? [22:15] just any pcie with nec chipsets? [22:16] If the card has two plugs and shows up as two ports, then you could use the other port for other uses. [22:16] That is what I have heard. To be honest... unless I try it in my system, I don't know. [22:17] hmm ok [22:17] well, that article you sent me earlier gives hope! [22:19] 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] oh, I'll check for compatibility then [22:26] * OvenWerks has to go for a while