| fred1807 | ubuntustudio | 13:48 |
|---|---|---|
| fred1807 | how do I specify my "ladcomp" alsa plugin, as MPD output, in mpd.conf? device "hw:0,0" | 13:48 |
| 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!!! | 16:42 |
| Adro | running ubuntu studio 16.04lts | 16:46 |
| OvenWerks | Adro: you may need to get a pcie USB card. The intel USB ports do have issues. | 17:22 |
| 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 | 17:23 |
| Adro | that I know it is an issue in my system | 17:24 |
| 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 | 17:25 |
| 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 | 17:26 |
| 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 | 17:27 |
| 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!!! | 21:38 |
| 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 | 21:44 |
| 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) | 21:46 |
| adro_ | OvenWerks: yes, the chipset is 8 Series/C220 Series | 21:49 |
| OvenWerks | adro_: have you edited your rtinit file yet? | 21:50 |
| 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 | 21:51 |
| 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 | 21:52 |
| adro_ | OvenWerks: yes, that's the thing | 21:53 |
| OvenWerks | ok. in a terminal type cat/proc/interrupts | 21:53 |
| 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 | 21:54 |
| 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. | 21:55 |
| OvenWerks | (mouse generates a lot of interupts) | 21:56 |
| adro_ | OvenWerks: the issue is no matter where I plug what everything is under the same bus | 21:57 |
| OvenWerks | You are begining to see why another USB card would be helpful :( | 21:59 |
| 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 | 22:01 |
| OvenWerks | Ya, I think things have changed since USB3 came out. | 22:03 |
| adro_ | OvenWerks: where can I find the rtinit file? | 22:03 |
| 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 | 22:04 |
| OvenWerks | why? | 22:05 |
| 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. | 22:07 |
| OvenWerks | I have heard that even the NEC based USB3 cards work well | 22:08 |
| 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 | 22:09 |
| 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 | 22:10 |
| 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? | 22:11 |
| 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 | 22:12 |
| OvenWerks | The Kernel will load the right drivers for the card | 22:13 |
| adro_ | OvenWerks: ok | 22:13 |
| 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 | 22:14 |
| adro_ | so, you recon that one specifically would work on my machine??? | 22:15 |
| adro_ | just any pcie with nec chipsets? | 22:15 |
| 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. | 22:16 |
| adro_ | hmm ok | 22:17 |
| adro_ | well, that article you sent me earlier gives hope! | 22:17 |
| 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. | 22:19 |
| adro_ | oh, I'll check for compatibility then | 22:21 |
| * OvenWerks has to go for a while | 22:26 | |
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