both the author of the patch and the reporter/tester who has the same hardware as yours
have you try latest alsa-driver https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/?id=521290003a34115fa06f048285bcb5b7708eee9f should adding dock headphone jack change the max_channels from 2 to 4 when the headphone jacks are not at the same location (Ext Left and Sep Rear) , for those dual headphone jacks are at the same location in Default 0x2121103f: [Jack] HP Out at Sep Rear Conn = 1/8, Color = Black DefAssociation = 0x3, Sequence = 0xf, Misc = 0x0 seem related to this patch https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda/hda_generic.c?id=a07a949be6eb1c9aab06adaadce72dbd27b7d9cb + if (cfg->line_out_type != AUTO_PIN_HP_OUT) + spec->const_channel_count = max(spec->const_channel_count, + cfg->hp_outs * 2); -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1261255 Title: [2359CTO, Realtek ALC269VC, Speaker, Internal] No sound at all To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1261255/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
