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

[David Henningsson]

On 02/28/2013 08:21 AM, Takashi Iwai wrote:
> 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.

The test was done on a 3.8 based kernel. Isn't LPIB delay counting 
enabled there as well?

(Alsa-info is here: https://launchpadlibrarian.net/132247367/AlsaInfo.txt )

>
>
> 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
>>
>



-- 
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic