At Thu, 07 Feb 2008 13:09:24 +0100, I wrote: > > At Wed, 6 Feb 2008 12:09:35 +0100, > Grzegorz Chwesewicz wrote: > > > > From Andrew Morton: > > > > "Recording the bug in the alsa bugtracker is good, and Takashi is actively > > working on the bug, and he is the best guy to do that. > > > > So I don't think anything else really needs to be done here - please work > > with him on solving this?" > > > > ###################################### > > > > Hi, Takashi, so can You help ? Below is my letter to LKML (in case You haven't > > read it yet). > > Don't worry, I've been reading it, but had too little time to track > down. > > > Problem description: > > > > I have a problem with recording on HP nx6325 notebook (hda-intel with AD1981HD > > codec). Playback works fine, but after 5-10 min. of recording microphone > > stops working (playback works all the time). Unloading and loading sound > > modules fixes problem, but only for another 5-10 minutes. This problem exists > > from more than a year (at least from 2.6.17.13 kernel). In [1] we came to > > conclusion that this problem is ralated to IRQ sharing [2] (HDA Intel is on > > the same IRQ as sata_sil). > > > > How to reproduce the problem: > > > > 1) on one console run arecord and see the output (You should see some garbage) > > 2) on another console run cat /etc/* > > 3) at once arecord on the first console gives no output > > > > So, doing lot of hdd I/O occurs problem with mic. > > > > What had been done: > > > > 1) I tried to boot Fedora 8 livecd and unload sata_sil, so that hda_intel was > > the only device using IRQ. After that microphone was working all the time (I > > left recording for all night, and in the morning I had almost 2h voip chat > > using Twinkle). So when sata_sil is unloaded, and hda-intel is not sharing > > the IRQ, the mic. is working all the time. Look at [3] to > > see /proc/interrupts output when laptop is booted from livecd, and mic works. > > > > 2) I tried to load hda-intel with enable_msi=1 (my RS480 chip is on blacklist, > > but I've removed it). Module loads and playback works ok, but problem with > > mic still exists. Difference here is that when recording stops to work the > > playback also stops to work (without MSI only mic stops to work). Look at [4] > > to see /proc/interrupts output when module is loaded with enable_msi=1. > > > > Question: > > > > What information I need to provide to help resolving the problem ? Where to > > start, because I've run out of ideas :) ? > > This is a pretty nasty bug. Appreantly this seems specific to ATI > chipset, and I'm not sure whether it's AD1981HD specific, too. > (Due to the fact that it's related with IRQ, I guess rather not > specific to the codec chip.) > > It's nice that you already tried MSI as I suggsted. > Could you check whether the irq handler still gets called? For > example, try the patch below and see whether the message appears. BTW, do you have problems found in below? https://bugzilla.novell.com/show_bug.cgi?id=297703 According to the reporter, nc6400 with AD1981 has a problem with headphone jack auto-muting and with the non-linear master volume. I supplied two test patches there. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
