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@@ -119,10 +119,18 @@ the codec slots 0 and 1 no matter what the hardware reports.
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Interrupt Handling
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~~~~~~~~~~~~~~~~~~
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-In rare but some cases, the interrupt isn't properly handled as
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-default. You would notice this by the DMA transfer error reported by
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-ALSA PCM core, for example. Using MSI might help in such a case.
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-Pass `enable_msi=1` option for enabling MSI.
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+HD-audio driver uses MSI as default (if available) since 2.6.33
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+kernel as MSI works better on some machines, and in general, it's
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+better for performance. However, Nvidia controllers showed bad
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+regressions with MSI (especially in a combination with AMD chipset),
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+thus we disabled MSI for them.
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+
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+There seem also still other devices that don't work with MSI. If you
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+see a regression wrt the sound quality (stuttering, etc) or a lock-up
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+in the recent kernel, try to pass `enable_msi=0` option to disable
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+MSI. If it works, you can add the known bad device to the blacklist
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+defined in hda_intel.c. In such a case, please report and give the
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+patch back to the upstream developer.
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HD-AUDIO CODEC
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Takashi Iwai