| . acpi_osi=Linux Het kan gebeuren dat ACPI niet volledig werkt zoals het is bedoeld onder Linux. By default probeert Linux zichzelf voor te doen als Windows. Echter kan dit in een enkel geval averechts werken. Door acpi_osi=linux in te zetten doet Linux zichzelf echt voor als Linux. acpi_osi=linux zorgt ervoor dat Linux echt als Linux reageert op ACPI calls. Geluidskaarten werken soms niet door verkeerde ACPI calls. Door acpi_osi=linux in te zetten kan de hardware herkenning beter verlopen. De geluidskaart wordt wel herkend (er is echter geen geluid of storend geluid) Het is mogelijk dat de geluidskaart wel hardwarematig wordt herkend, dus de BCLD start keurig door, maar toch is geen geluid, storend geluid of het geluid komt over de speakers. Als de log van de BCLD wordt bekeken, dan wordt de hardware vaak als 'card0' of 'card1' gezien. .Ook in dit geval is het mogelijk om parameters toe te passen. Deze parameters kunnen invloed hebben op de manier waarop de Linux kernel met de audio hardware communiceert. 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. Let op: In sommige gevallen kunnen onderstaande parameters ook ter test worden gebruikt indien de hardware niet wordt herkend en de BCLD afsluit bij het opstarten (BCLD Kaiju) of de melding wordt getoond 'no soundcard detected' in de hardware tree (BCLD Leviathan) en de eerder genoemde parameters niet het gewenste effect hebben. 1 acpi=off of acpi=force Sommige geluidskaarten hebben problemen met ACPI (Advanced Configuration and Power Interface). Door ACPI uit te schakelen of geforceerd in te schakelen, kan het systeem de geluidskaart beter herkennen.Deze parameters kunnen in sommige gevallen worden gecombineerd op 1 Grub regel. 2 pci=noacpi Dit kan helpen als er een conflict is tussen PCI-verbindingen en ACPI, wat de geluidskaart kan beïnvloeden. Soms uit dit zich in storend geluid, vaak wordt er in de logging meldingen gemaakt van veel acpi error m.b.t. de geluidskaart. 3 irqpoll Dit kan worden gebruikt als er problemen zijn met IRQ-onderbrekingen die de geluidskaart beïnvloeden. Storend en krakend geluid zijn er voorbeelden van. 4 snd_hda_intel.model=auto Als de geluidskaart gebaseerd is op een HDA (High Definition Audio) chipset, kunt u de kernel vertellen d.m.v. deze parameter om een standaard geluidsconfiguratie te gebruiken. Dit helpt vaak bij geluidsproblemen.U kunt in plaats van auto ook een specifiek model proberen, zoals dell, hp, of andere geluidskaartmodellen die eventueel volgens de documentatie van ALSA (Advanced Linux Sound Architecture) aanwezig i--> Voor Linux gebruikers die precies weten welke chipset er wordt gebruikt. 5 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. 6 snd_hda_intel.index=0 Als er meerdere geluidskaarten zijn en u wilt ervoor zorgen dat een specifieke geluidskaart wordt gebruikt als card0 (de standaardkaart), kan deze worden parameter gebruikt om de volgorde in te stellen. | | page | {"name":"page","children":[{"id":"Z2G7dT9d4OB3muYD2bcyi","params":{"background":{"light":"#ffffff","dark":"#1d2125"},"padding":0,"gap":10},"children":[],"name":"section"},{"params":{"padding":0,"gap":10,"background":"#ffffff4f"},"children":[{"name":"row","children":[{"name":"column","children":[{"name":"text","params":{"templateId":"headline 2","value":[{"type":"paragraph","children":[{"letterSpacing":0,"text":"BCLD Advanced soundcard","color":{"light":"#000000"},"fontWeight":700,"fontFamily":"Lato, sans-serif","fontSize":24}],"align":"center"}]},"children":[],"id":"GCKn8yWqNLJ7J1VIX0q7J"},{"name":"text","params":{"templateId":"headline 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blue text","isPro":true,"value":[{"type":"paragraph","children":[{"type":"paragraph","children":[{"text":"Op deze pagina worden parameters getoond die op de Grubregel van de BCLD ingevuld 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PXE)."}]},{"type":"paragraph","align":"center","children":[{"letterSpacing":-1,"lineHeight":"0.8","fontFamily":"unset","fontWeight":900,"color":{"light":"#eeeeee","type":"","gradient":{"light":{"angle":90,"colors":["#1FA2FF","#12D8FA"],"stops":[0,100]},"dark":{"angle":90,"colors":["#1FA2FF","#12D8FA"],"stops":[0,100]}}},"fontSize":28,"text":""}]},{"type":"paragraph","align":"left","children":[{"letterSpacing":-1,"lineHeight":"0.8","fontFamily":"unset","fontWeight":900,"color":{"light":"#eeeeee","type":"","gradient":{"light":{"angle":90,"colors":["#1FA2FF","#12D8FA"],"stops":[0,100]},"dark":{"angle":90,"colors":["#1FA2FF","#12D8FA"],"stops":[0,100]}}},"fontSize":28,"text":""}]},{"type":"paragraph","align":"left","children":[{"letterSpacing":-1,"lineHeight":"0.8","fontFamily":"unset","fontWeight":900,"color":{"light":"#eeeeee","type":"","gradient":{"light":{"angle":90,"colors":["#1FA2FF","#12D8FA"],"stops":[0,100]},"dark":{"angle":90,"colors":["#1FA2FF","#12D8FA"],"stops":[0,100]}}},"fontSize":28,"text":""}]}]}]},"children":[],"id":"ZGSXv3HwySztCGh4LDMdN"},{"name":"text","params":{"templateId":"headline 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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 (BCLD Kaiju) 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. ","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":"Let er wel op dat de headset vooraf wel aangesloten moet zijn! Dit laat de herkenning van de audio apparatuur doorgaans beter verlopen."}]},{"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":"Gebruikt u een latere versie van de BCLD zoals BCLD Leviathan? Dan zal de BCLD, ook als er geen geluid hardware wordt aangetroffen, door kunnen starten, maar wordt er tijdens het opstarten (in de hardware tree) aangegeven dat er geen geluidskaart is aangetroffen (no sound card detected). Ook dan kunt u de onderstaande stappen en parameters gebruiken om alsnog geluid te krijgen. "}]},{"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":"Een niet aangetroffen geluidskaart kan simpelweg betekenen dat de geluidskaart niet of niet goed herkend wordt door de BCLD. Het niet of niet goed herkennen van een geluidskaart 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 (de fabrikant van de hardware heeft bijvoorbeeld (nog) geen (aangepaste) open source drivers. Vaak zal een latere kernel wel een betere ondersteuning bieden vanuit de opensource drivers."}]},{"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":"Het kan ook gebeuren dat oudere BCLD versies prima werkten met de geluidskaart maar een nieuwe BCLD versie niet. 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). Vaak zien we dat scholen computers gebruiken waarvan de BIOS letterlijk al jaren niet is bijgewerkt. Dan volgt er uiteindelijk een mismatch tussen BIOS aansturing en kernel van de BCLD - en horen we vaak: Vorig schooljaar werkte het wel... De BCLD zal met nieuwe BCLD versies ook hogere (nieuwere) kernel versies krijgen, als de BIOS niet wordt bijgewerkt kan dit uiteindelijk een mismatch opleveren met het niet herkennen van een geluidskaart als gevolg. "}]},{"type":"paragraph","children":[{"fontSize":16,"lineHeight":"24px","color":"#555","letterSpacing":0,"fontFamily":"Open Sans, sans-serif","text":"Een BIOS update lost dit vaak op. "}]},{"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. "}]},{"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":"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. 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