[alsa-devel] [PATCH] ALSA: hda - Use LPIB position fix for Acer AO751h

[Takashi Iwai]

At Thu, 28 Feb 2013 08:18:30 +0100,
David Henningsson wrote:
> 
> The user reports a regression (choppy audio), and that
> position_fix=1 (or position_fix=4) fixes the issue.
> 
> This is a Poulsbo controller (8086:811b (rev 07)), so might be
> worth checking if other Poulsbo machines suffer from the same bug.
> 
> Cc: stable at vger.kernel.org [v3.7+]
> BugLink: https://bugs.launchpad.net/bugs/1132562
> Signed-off-by: David Henningsson <david.henningsson at canonical.com>

Please check whether the latest sound git tree works as is.
We enabled the LPIB delay counting for Poulsbo there, and it may fix
most cases.


Takashi


> ---
>  sound/pci/hda/hda_intel.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
> index 4cea6bb6..3505f1e 100644
> --- a/sound/pci/hda/hda_intel.c
> +++ b/sound/pci/hda/hda_intel.c
> @@ -3114,6 +3114,7 @@ static bool check_hdmi_disabled(struct pci_dev *pci)
>   * white/black-listing for position_fix
>   */
>  static struct snd_pci_quirk position_fix_list[] = {
> +	SND_PCI_QUIRK(0x1025, 0x0244, "Acer AO751h", POS_FIX_LPIB),
>  	SND_PCI_QUIRK(0x1028, 0x01cc, "Dell D820", POS_FIX_LPIB),
>  	SND_PCI_QUIRK(0x1028, 0x01de, "Dell Precision 390", POS_FIX_LPIB),
>  	SND_PCI_QUIRK(0x103c, 0x306d, "HP dv3", POS_FIX_LPIB),
> -- 
> 1.7.9.5
>