It might be the kernel too, in whose case you'll have to wait for the next release of Ubuntu (or try to install the latest from kernel.org).
Thanks. I just installed KPowersave, and disabled Klaptop. I see that
KPowersave gives me the option of disabling the lock screen. However,
even with the lock screen disabled, my screen stays black (lit, but
black) when I resume.
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