Sound on the Dell XPS13 doesn't work out of the box when in I2S mode. Configuration has been added to alsa in http://git.alsa-project.org/?p=alsa-lib.git;a=commit;h=3c263716fd5bd2d9d5308cb13dba667d138c0097 but isn't present in our release.
Fedora 22 changed to end-of-life (EOL) status on 2016-07-19. Fedora 22 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.
alsa-lib-1.1.1-1.fc23.x86_64, the current version of alsa-lib for F23, doesn't ship this configuration. I can't speak for the F24 version.