linux-kernel - Re: [alsa-devel] snd-intel-hda: screaming IRQ with 3.5.3 kernel (HDMI)

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Date:	Mon, 10 Sep 2012 12:58:23 -0700 (PDT)
From:	Chris Rankin <rankincj@...oo.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [alsa-devel] snd-intel-hda: screaming IRQ with 3.5.3 kernel (HDMI)

----- Original Message -----
> Did you try any workaround boot options such as irqpoll, pci=nocrs or whatever?


OK, the "irqpoll=1" option does help here. Although this message is obviously scary:

Misrouted IRQ fixup and polling support enabled
This may significantly impact system performance


And the "pci=nocrs" option does Really Bad Things to the display at boot-time.

So what is "irqpoll" actually doing, please? Is it just a temporary workaround for a driver bug?

Thanks,
Chris

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