sigrok-firmware doesn't include the fx2lafw-sigrok-fx2-16ch.fw or fx2lafw-sigrok-fx2-8ch.fw files as the current version is too old. A newer version has been released on Nov. 27th 2015. This includes these firmwares: https://www.sigrok.org/blog/sigrok-firmware-fx2lafw-013-released They're necessary for a good out-of-the-box experience with the Hobby Components logic analyzer, which I have. Please update the sigrok-firmware package to 0.1.3 to enable support for these additional devices.
I updated this back in February, but for some reason forgot to push a build to the repos. My apologies.
sigrok-firmware-fx2lafw-0.1.3-0.fc23 has been submitted as an update to Fedora 23. https://bodhi.fedoraproject.org/updates/FEDORA-2016-d195ce5bad
sigrok-firmware-fx2lafw-0.1.3-0.fc23 has been pushed to the Fedora 23 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-d195ce5bad
sigrok-firmware-fx2lafw-0.1.3-0.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.