If it isn't a Dell laptop, it isn't the same bug, file a new bug report.
If it's exactly the same cause, i.e. brightness function keys reporting
a down but not an up, then the solution will be similar but laptop
vendor, possibly even laptop model, specific. This bug is treating Dell
laptops with this issue. If yours is not a Dell laptop, then file a
separate bug report.

https://help.ubuntu.com/community/ReportingBugs

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X never sees brightness key release events on Dell laptops
https://bugs.launchpad.net/bugs/261721
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