Despite no activity on this bug, the fault is still there. If Musescore is started first, the sound is distorted. If the Sound panel (under Systems Settings) is opened when Musescore is playing distorted sound and the test buttons activated, then the tests are also distorted.
If Musescore is shut down and the test buttons activated, the test sounds play undistorted. If Musescore is subsequently started, it then appears to play undistorted sound. I have gone to the trouble of reporting this bug in the hope that its solution might contribute to improvement of Ubuntu. If noone else is sufficiently concerned, then the bug report will probably expire again, even though the bug remains. Hopefully, it will not be there in 16.04 but if it is, one can only continue to file a report on it. ** Changed in: alsa-driver (Ubuntu) Status: Expired => Confirmed -- 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/1513273 Title: [XPS13 9333, Realtek ALC3661, Speaker, Internal] Sound is distorted Status in alsa-driver package in Ubuntu: Confirmed Bug description: The distorted sound only occurs when using MuseScore 2.0.2 to play music through the speakers. The sound initially appears distorted and crackly. Using the Sound app to test the speakers, the normal test signal is distorted and crackly, even though the tests sound normal before the MuseScore app is launched. This distortion persists for an indeterminate period of time, sometimes a few seconds, sometime several minutes. Then, all of a sudden, the sound quality returns to normal and the test signals sound normal without distortion. This seems to occur every time MuseScore is started, even though the sound quality when tested using the Sound app or playing sound from the Videos and Rhythmbox Music Player before MuseScore is started is normal and distortion-free. ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: alsa-base 1.0.25+dfsg-0ubuntu5 ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3 Uname: Linux 4.2.0-16-generic x86_64 ApportVersion: 2.19.1-0ubuntu4 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/pcmC1D0p: david 1495 F...m pulseaudio /dev/snd/controlC1: david 1495 F.... pulseaudio /dev/snd/controlC0: david 1495 F.... pulseaudio CurrentDesktop: Unity Date: Thu Nov 5 00:17:09 2015 InstallationDate: Installed on 2015-07-23 (104 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422) PackageArchitecture: all ProcEnviron: LANGUAGE=en_GB:en PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_GB.UTF-8 SHELL=/bin/bash SourcePackage: alsa-driver Symptom: audio Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful Symptom_Card: Built-in Audio - HDA Intel PCH Symptom_Jack: Speaker, Internal Symptom_PulsePlaybackTest: PulseAudio playback test successful Symptom_Type: Digital clip or distortion, or "overdriven" sound Title: [XPS13 9333, Realtek ALC3661, Speaker, Internal] Sound is distorted UpgradeStatus: Upgraded to wily on 2015-10-22 (13 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1513273/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp