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.ht...

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),