Public bug reported: Ever since the "up"grade to Ubuntu Natty, I have been having a host of problems with regards to audio. Foremost among them is the unreliable detection of sound related hardware during boot time. I have since done a clean install (keeping only home folder, but deleting all configuration other than Wine prefixes and virtual machines). The problem persists even now.
The symptoms of the problem are thus: at boot time, 3 things may happen: (1) the sound hardware (snd-hda-intel) will simply not be detected, (2) the sound hardware is detected but the codec isn't (snd-hda-codec- conexant) or (3) both are detected. For cases (1) and (2), no sound is possible. Usually, but not always, I can get sound back by booting into a Lucid Live CD then booting back into Natty. For case (3), sound works, but is likely to stop working after a period of inactivity or with certain applications (Flash with Firefox, and Wine, are both reliable "killers" of audio); after audio stops working, I can get it back if I kill all programs that were using audio and run the following script: echo "autospawn=no" > ~/.pulse/client.conf pulseaudio -k killall -q pulseaudio sudo alsa force-reload echo "autospawn=yes" > ~/.pulse/client.conf pulseaudio -D Sometimes, though, the above script will give the same results as case (2) above, which leads me to believe the issues are related. I have added the following lines to /etc/modprobe.d/alsa-base.conf (much as I needed to since Karmic): Top: alias snd-card-0 snd-hda-intel alias sound-slot-0 snd-hda-intel install snd-hda-intel /sbin/modprobe --ignore-install snd-hda-intel $CMDLINE_OPTS End: options snd-hda-intel index=-2 power_save=0 power_save_controller=N At the moment, I have been able to get only case (1) working; the output of alsa-info.sh under these circumstances is here: http://www.alsa- project.org/db/?f=f157afd6ad28a41962b9058b164b3bdbd0dbf9be Yesterday, I was able to get sound fully working; under those circumstances, alsa-info.sh returns this: http://www.alsa- project.org/db/?f=28ff7b24dba70a86acc5e8ae6d2dd5ef3bf1220b The difference between cases (2) and (3) is that the Conexant codec is not found; the hardware is found, but I only have a "Dummy output" available for selection. kern.log confirms this: when I run the script I gave above, the following lines are printed in case (2): [112070.826937] HDA Intel 0000:00:07.0: PCI INT A -> Link[LAZA] -> GSI 21 (level, low) -> IRQ 21 [112070.826942] hda_intel: Disable MSI for Nvidia chipset [112070.827006] HDA Intel 0000:00:07.0: setting latency timer to 64 [112070.900039] hda-intel: no codecs found! [112070.900099] HDA Intel 0000:00:07.0: PCI INT A disabled But the following lines are printed in case (3): [ 5.858654] HDA Intel 0000:00:07.0: PCI INT A -> Link[LAZA] -> GSI 21 (level, low) -> IRQ 21 [ 5.858657] hda_intel: Disable MSI for Nvidia chipset [ 5.858717] HDA Intel 0000:00:07.0: setting latency timer to 64 If there is any further information I can give to help solve this problem, please ask. ** Affects: ubuntu Importance: Undecided Status: New ** Tags: audio conexant hda intel natty -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779983 Title: [Natty] Unreliable detection of snd-hda-intel with Conexant CX20549 codec -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
