That's surprising, and is the opposite of what I would expect. Are you
saying the high power usage occurs _with) nvidia-driver-390 installed?
Anyway, back on the original "latency" problem this bug is about...
It sounds like this is actually an output latency problem, related to
the nouveau driver and possibly related to the recurring kernel
messages:
[80940.257342] nouveau 0000:02:00.0: bus: MMIO write of 00000002 FAULT
at 4188ac [ IBUS ]
** Package changed: gnome-shell (Ubuntu) => linux (Ubuntu)
** Summary changed:
- Input latency in 18.04
+ High visual latency in 18.04 when using nouveau
** Changed in: linux (Ubuntu)
Status: Incomplete => New
** Tags added: nouveau performance
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https://bugs.launchpad.net/bugs/1756877
Title:
High visual latency in 18.04 when using nouveau
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