I am also one of the affected users. I want to contribute towards fixing this / writing enhancements in the ALSA / pulseaudio. How do I get started with audio driver development?
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to alsa-driver in Ubuntu. https://bugs.launchpad.net/bugs/1672822 Title: sound only coming from left speaker on acer predator (fresh install) Status in alsa-driver package in Ubuntu: Confirmed Status in pulseaudio package in Ubuntu: Confirmed Bug description: Ubuntu version: Ubuntu 16.10 and a fresh install of 17.04 and even fedora F25-WORK-x86_64-20170228 via live usb Device: acer predator: G9-593-7757 15,6"/i7-7700/32 GB RAM/512 GB SSD/1 TB HDD/GTX1070 expected: sound comes out of both left and right speaker and the subwoofer what happened instead: Sound only comes out of the left speaker or subwoofer. More system information: $ aplay -l **** List of PLAYBACK Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: ALC255 Analog [ALC255 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 audio chip (on motherboard): VGA Chip nVidia N17E-G2-A1 GP104-725-A1 note that that is only 1 device, one would expect several here. I attempted to fix this by modifying the /etc/pulse/deamon.conf into the following: # This file is part of PulseAudio. # # PulseAudio is free software; you can redistribute it and/or modify # it under the terms of the GNU Lesser General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # PulseAudio is distributed in the hope that it will be useful, but # WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU # General Public License for more details. # # You should have received a copy of the GNU Lesser General Public License # along with PulseAudio; if not, see <http://www.gnu.org/licenses/>. ## Configuration file for the PulseAudio daemon. See pulse-daemon.conf(5) for ## more information. Default values are commented out. Use either ; or # for ## commenting. ; daemonize = no ; fail = yes ; allow-module-loading = yes ; allow-exit = yes ; use-pid-file = yes ; system-instance = no ; local-server-type = user ; enable-shm = yes ; enable-memfd = yes ; shm-size-bytes = 0 # setting this 0 will use the system-default, usually 64 MiB ; lock-memory = no ; cpu-limit = no ; high-priority = yes ; nice-level = -11 ; realtime-scheduling = yes ; realtime-priority = 5 ; exit-idle-time = 20 ; scache-idle-time = 20 ; dl-search-path = (depends on architecture) ; load-default-script-file = yes ; default-script-file = /etc/pulse/default.pa ; log-target = auto ; log-level = notice ; log-meta = no ; log-time = no ; log-backtrace = 0 ; resample-method = speex-float-1 ; enable-remixing = yes enable-lfe-remixing = yes ; lfe-crossover-freq = 0 flat-volumes = no ; rlimit-fsize = -1 ; rlimit-data = -1 ; rlimit-stack = -1 ; rlimit-core = -1 ; rlimit-as = -1 ; rlimit-rss = -1 ; rlimit-nproc = -1 ; rlimit-nofile = 256 ; rlimit-memlock = -1 ; rlimit-locks = -1 ; rlimit-sigpending = -1 ; rlimit-msgqueue = -1 ; rlimit-nice = 31 ; rlimit-rtprio = 9 ; rlimit-rttime = 200000 ; default-sample-format = s16le ; default-sample-rate = 44100 ; alternate-sample-rate = 48000 default-sample-channels = 3 default-channel-map = front-left,front-right,lfe ; default-fragments = 4 ; default-fragment-size-msec = 25 ; enable-deferred-volume = yes deferred-volume-safety-margin-usec = 1 ; deferred-volume-extra-delay-usec = 0 but this did not work. I also tried various other permutations to see if changing the order of front-left,front-right,lfe would work but it did not. I also tried to see if it would work in fedora but the same problem occurred there. When on ubuntu 16.10 at first only the subwoofer seemed to be working and altering the file only the left speaker was working. On ubuntu 17.04 only the left speaker was working regardless of how I altered the above file. Note that the speakers work perfectly fine on windows 10. Looking around online there seem to be a lot of problems with acer predator laptops and sound on ubuntu. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1672822/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
