Hi, On Tue, Apr 07, 2009, Xu, Martin wrote: > We have found a2dp issue, that bluez earphone can not work. The issue has > filed at: https://bugzilla.moblin.org/show_bug.cgi?id=1355 > (Some one can kindly tell me where I can file the bluez bug. So I can > transfer the bug from moblin bugzilla there.) There's no bluez "bugzilla". The email you sent to this list should be good enough. > The root cause is that: > bluez-alsa-plugin has issue at poll revents. > alsa lib needs to poll 2 channel state. But bluez-alsa-plugin only handles > channel1 revent, and leave another one unhandled which leads to the channel's > poll state unpredictable, consequently, pcm stream transfer is broken for the > wront poll state, and bluethooh earphone(a2dp) can not work. > I have worked out a patch to fix the issue, which is listed as below. This is a well known issue with all bluez versions after 4.27. It has been discussed several times on the #bluez channel as well as the alsa-devel mailing list [1]. It's caused by commit 593bd41ed861d80f498fa8cfe0cea06e0c11f442 (which btw also has a link to the alsa-devel thread) and unfortunately it seems we cannot revert it. The conclusion from the alsa side was that the correct behavior for applications is to always pass just one filedescriptor in revents and so if we try to read revents[1] we'd be accessing invalid memory with applications that use the API correctly. Johan [1] http://mailman.alsa-project.org/pipermail/alsa-devel/2009-February/014392.html -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
