Messages in this thread | | | Date | Tue, 29 Nov 2011 13:07:32 +0100 | From | Takashi Iwai <> | Subject | Re: ALSA: hda_intel - revert a quirk that affect VIA chipsets |
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At Tue, 29 Nov 2011 12:21:17 +0100, Marc Vertes wrote: > > This quirk sould be reverted. It has the following probems: > > 1) The quirk was intended to "ASUS MV2-MX SE" motherboards only, but the > ID used matches a much broader range, potentially all boards containing a > VIA chipset model in the family of vendor VIA 0x1106 and audio device ID > 0x3288, which encompasses VIA-VT82xx, VIA-VT1xx and VIA-VT20xx chipsets. > > 2) VIA chipsets rely on azx_via_get_position() to handle correctly dma > transfers during capture. Using POS_FIX_LPIB instead of POS_FIX_VIACOMBO > leads to partially corrupted input buffers during capture. The effects > of this bug are not immediately visible, it took strong DSP expertise, > some expensive signal generator and a spectrum analyzer to identify it > and verify correct behaviour using original default. > > 3) It's almost certain that the quirk did not fix the real problem, > if there was one. Refer to original submission: > http://mailman.alsa-project.org/pipermail/alsa-devel/2010-February/025109.html > > Signed-of-by: Marc Vertes <mvertes@sigfox.com>
Applied now. Thanks.
Takashi
> > --- linux-3.2-rc3/sound/pci/hda/hda_intel.c.orig 2011-11-24 05:20:28.000000000 +0100 > +++ linux-3.2-rc3/sound/pci/hda/hda_intel.c 2011-11-28 17:29:01.044095455 +0100 > @@ -2508,7 +2508,6 @@ static struct snd_pci_quirk position_fix > SND_PCI_QUIRK(0x1043, 0x81b3, "ASUS", POS_FIX_LPIB), > SND_PCI_QUIRK(0x1043, 0x81e7, "ASUS M2V", POS_FIX_LPIB), > SND_PCI_QUIRK(0x104d, 0x9069, "Sony VPCS11V9E", POS_FIX_LPIB), > - SND_PCI_QUIRK(0x1106, 0x3288, "ASUS M2V-MX SE", POS_FIX_LPIB), > SND_PCI_QUIRK(0x1297, 0x3166, "Shuttle", POS_FIX_LPIB), > SND_PCI_QUIRK(0x1458, 0xa022, "ga-ma770-ud3", POS_FIX_LPIB), > SND_PCI_QUIRK(0x1462, 0x1002, "MSI Wind U115", POS_FIX_LPIB), >
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