I've re-tested with 4.16.6: still happening, the battery life is about 50% down.
If I blacklist the nouveau kernel module, then the module stops crashing in loop, which improves battery time a little bit, but the difference with 4.15 is still startling. Note that blacklisting the nouveau kernel module has the side effect of preventing the kernel from putting the video card to sleep, which drains the battery even more. -- Pierre Neidhardt
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