Since upgrading to 15.04, I still experience inconsistent behaviour in the sound system. Sometimes, the system does not detect the speakers at all on boot-up. At other times, the Sound panel shows the HDMI sound in the Settings for Speakers section (although this can be corrected by clicking on the Speakers in the Play Sound Through box.
Currently (under 15.04), plugging in headphones no longer brings up the dialogue box requesting to know what device was plugged into the headphone socket (Stereo Headphones, Headset with microphone or microphone alone). The Headphones appear in the Play Sound Through listing and disappear when the headphones are removed. The sound is directed from the speakers to the headphones if the latter are plugged in. However, now (under 15.04) it is possible to select the Speakers for the sound output even when the headphones are plugged in. This was certainly not the case under 14.10 where the headphones had priority as though the headphone socket was hard wired. I have just tried plugging a mono microphone in the headphone socket. This causes the headphones to appear in the Play Sound Through box. Unfortunately, the sound has now gone crackly and is not responding to a change of volume control keys. A reboot seems to be called for. When playing sound from a Video (using the Videos app), the sound can become crackly although it can be restored to normal by exercising the volume control keys (F11 & F12) up and down. If this fails and the sound disappears altogether, it is necessary to reboot although this does not work every time and several reboots are required to restore the sound to normal. If I use the Volume Control app's Configuration tab to set the Built-in Audio option to Off, the Speakers in the Sound app show Settings for HDMI / DisplayPort Mode as Digital Stereo (HDMI) Output. By clicking on the Speakers in the Play Sound Through box, the Settings for Speakers are restored with the Test Sound button appearing. The Built-in Audio Profile changes from Off to Analogue Stereo Output. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to alsa-driver in Ubuntu. https://bugs.launchpad.net/bugs/1408110 Title: [XPS13 9333, Realtek ALC3661, Speaker, Internal] fails after a while Status in alsa-driver package in Ubuntu: New Bug description: When playing a video via the Videos app, the sound through the internal speakers develops crackles and sometimes disappears completely. I collected the data for the bug report at the instance that the sound had failed. Using the Sound panel in Systems Settings to test the sound produces no response. I have also selected the Volume Control app and attempted to switch the sound using the Configuration tab and switching the built-in audio between Off and Analogue Stereo Output. Sometimes this works and sometimes is does not. Having left the Videos app running whist typing this, I have noticed that the sound seems to start and stop whilst typing via the keyboard. I note that the Playback tab in the Volume Control window shows that the sound is being produced by the Videos app (the lower ribbon moves with the sound amplitude). This bug might be associated with intermittent recognition of the hardware on startup. The Sound window sometimes shows no audio device. At other times, the speakers are given the HDMI menu dropdown but this can be corrected by plugging in a pair of headphones and switching back to the speakers which then show the correct Test Sound legend. I have noticed several instances of the sound cutting out and cutting back in whilst typing this report as if the interrupts from the keyboard strokes are interrupting the sound connection. ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: alsa-base 1.0.25+dfsg-0ubuntu4 ProcVersionSignature: Ubuntu 3.16.0-29.39-generic 3.16.7-ckt2 Uname: Linux 3.16.0-29-generic x86_64 ApportVersion: 2.14.7-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/pcmC0D3p: david 2288 F...m pulseaudio /dev/snd/controlC0: david 2288 F.... pulseaudio /dev/snd/pcmC1D0p: david 2288 F...m pulseaudio /dev/snd/controlC1: david 2288 F.... pulseaudio CurrentDesktop: Unity Date: Tue Jan 6 21:15:39 2015 InstallationDate: Installed on 2014-12-11 (26 days ago) InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2) PackageArchitecture: all SourcePackage: alsa-driver Symptom: audio Symptom_Card: Built-in Audio - HDA Intel PCH Symptom_Jack: Speaker, Internal Symptom_Type: Sound works for a while, then breaks Title: [XPS13 9333, Realtek ALC3661, Speaker, Internal] fails after a while UpgradeStatus: Upgraded to utopic on 2014-12-11 (25 days ago) dmi.bios.date: 09/11/2014 dmi.bios.vendor: Dell Inc. dmi.bios.version: A05 dmi.board.name: 0D13CR dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: 0.1 dmi.modalias: dmi:bvnDellInc.:bvrA05:bd09/11/2014:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn0D13CR:rvrA00:cvnDellInc.:ct8:cvr0.1: dmi.product.name: XPS13 9333 dmi.sys.vendor: Dell Inc. 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