I just booted a live iso of Fedora 26 LXDE and noted a few things.
1. It is not LXQT:(
2. The brightness setting (lxqt-config-brightness) is missing
Please please add this setting. It is really painful to have to run a terminal command to adjust brightness, as i had to do on Fedora 25.
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Sent from my Android device with K-9 Mail. Please excuse my brevity.