| summary | BCLD Advanced Voor geavanceerde BCLD gebruikers De geluidskaart wordt hardwarematig niet herkend - de BCLD sluit zichzelf af.Wanneer de BCLD wordt gestart, zal deze een controle doen op de aanwezigheid van een geluidskaart. Geluid is immers een essentieel onderdeel in veel toetsen en examens in Facet. Treft de BCLD tijdens deze controle geen geluidskaart aan? Dan zal de BCLD dit melden en zichzelf afsluiten.Door deze manier van starten wordt u tijdig geattendeerd op het feit dat de betreffende afnamecomputer geen afnames kan uitvoeren in Facet. Maar wat nu als er wél een geluidskaart aanwezig is? Dan kan het simpelweg betekenen dat de geluidskaart niet of niet goed herkend wordt door de BCLD. Het niet of niet goed herkennen van een geluidkaart kan meerdere oorzaken hebben: Van niet compatible zijn in Linux Ubuntu tot nog geen ondersteuning hebben vanuit de open source drivers in de gebruikte kernel. In Linux is het vaker het geval dat computers die zeer recent zijn uitgebracht, nog geen goede open source ondersteuning genieten vanuit de drivers. Vaak zal een latere kernel wel een betere ondersteuning bieden vanuit deze drivers. Soms moet de echte ondersteuning letterlijk door de hardware fabrikant worden toegevoegd in de vorm van een update van de (U)EFI firmware (BIOS update) Toch is er, door middel van toevoegingen van parameters, soms een oplossing te forceren. In de tekst hieronder leggen we uit welke parameters er toe te voegen zijn en wat deze parameters doen. Dit zijn geen parameters van Facet of vanuit de BCLD ontwikkelaar. Dit zijn Linux parameters die in veel verschillende Linux distributies toegepast kunnen worden. Er zijn geen garanties op te geven, noch kan de Helpdesk van Facet u hierin ondersteunen. pci=nomsi of pci=noaer Deze parameters kunnen helpen als er een probleem is met de PCI-bus waar de geluidskaart mee verbonden is. Sommige geluidskaarten hebben problemen met Message Signaled Interrupts (MSI), en het uitschakelen ervan kan helpen.Deze parameters kunnen in sommige gevallen worden gecombineerd op 1 Grub regel. acpi=off Problemen met het ACPI-systeem (Advanced Configuration and Power Interface) kunnen ervoor zorgen dat bepaalde hardware niet goed wordt herkend. Door ACPI uit te schakelen, kunnen sommige apparaten, zoals geluidskaarten, correct worden gedetecteerd. irqpoll Dit zorgt ervoor dat de kernel op een alternatieve manier omgaat met interrupt requests (IRQ's), wat kan helpen als de geluidskaart conflicten heeft met andere apparaten. snd_hda_intel.dmic_detect=0 Als u een HDA Intel geluidskaart heeft, kan deze parameter helpen bij problemen met het detecteren van de digitale microfoon-array (DMIC), wat soms de normale werking van de geluidskaart kan verstoren. Deze parameter wordt ook genoemd bij de standaard Veelgestelde Vragen van de BCLD. all_generic_ide In sommige gevallen kan het zijn dat de PCI-bus waarop de geluidskaart zit, niet goed wordt herkend door de kernel. Deze parameter dwingt het systeem om een generieke PC/IDE-driver te gebruiken voor de hardware, wat kan helpen bij detectieproblemen. forceenable=1 Dit dwingt de kernel om bepaalde apparaten, zoals de geluidskaart, te activeren, zelfs als ze standaard niet goed worden herkend. iommu=soft Als de geluidskaart via de PCI(e)-bus werkt en er wordt een moederbord met IOMMU (Input-Output Memory Management Unit) gestart, kan het inschakelen van de softwarematige IOMMU-ondersteuning de geluidskaart correct detecteren. |
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Geluid is immers een essentieel onderdeel in veel toetsen en examens in Facet. Treft de BCLD tijdens deze controle geen geluidskaart aan? Dan zal de BCLD dit melden en zichzelf afsluiten.","fontFamily":"Open Sans, sans-serif"}]},{"type":"paragraph","children":[{"fontSize":16,"lineHeight":"24px","color":"#555","letterSpacing":0,"fontFamily":"Open Sans, sans-serif","text":""}]},{"type":"paragraph","children":[{"fontSize":16,"lineHeight":"24px","color":"#555","letterSpacing":0,"fontFamily":"Open Sans, sans-serif","text":"Door deze manier van starten wordt u tijdig geattendeerd op het feit dat de betreffende afnamecomputer geen afnames kan uitvoeren in Facet. "}]},{"type":"paragraph","children":[{"fontSize":16,"lineHeight":"24px","color":"#555","letterSpacing":0,"fontFamily":"Open Sans, sans-serif","text":""}]},{"type":"paragraph","children":[{"fontSize":16,"lineHeight":"24px","color":"#555","letterSpacing":0,"fontFamily":"Open Sans, sans-serif","text":"Maar wat nu als er wél een geluidskaart aanwezig is? Dan kan het simpelweg betekenen dat de geluidskaart niet of niet goed herkend wordt door de BCLD. Het niet of niet goed herkennen van een geluidkaart kan meerdere oorzaken hebben: Van niet compatible zijn in Linux Ubuntu tot nog geen ondersteuning hebben vanuit de open source drivers in de gebruikte kernel. In Linux is het vaker het geval dat computers die zeer recent zijn uitgebracht, nog geen goede open source ondersteuning genieten vanuit de drivers. Vaak zal een latere kernel wel een betere ondersteuning bieden vanuit deze drivers. Soms moet de echte ondersteuning letterlijk door de hardware fabrikant worden toegevoegd in de vorm van een update van de (U)EFI firmware (BIOS update) "}]},{"type":"paragraph","children":[{"fontSize":16,"lineHeight":"24px","color":"#555","letterSpacing":0,"fontFamily":"Open Sans, sans-serif","text":""}]},{"type":"paragraph","children":[{"fontSize":16,"lineHeight":"24px","color":"#555","letterSpacing":0,"fontFamily":"Open Sans, sans-serif","text":"Toch is er, door middel van toevoegingen van parameters, soms een oplossing te forceren. In de tekst hieronder leggen we uit welke parameters er toe te voegen zijn en wat deze parameters doen. 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