[Nottingham] nvidia optimus - any OS

[Jason Irwin]

On 21/11/13 17:18, Mike Cardwell wrote:
> If you're running the latest Windows drivers and it's slower when using
> the Nvidia GPU, the card sounds broken to me.
That's what I am beginning to suspect. Might be a warranty job. Just
installing the latest (according to Lenovo) nvidia drivers.

> Unless Sauerbraten sees the faster GPU and so automatically tunes the game graphics settings for
> a higher performance card, but tunes them too high?
Nah, it's all manual. I deliberately set it to the same values as my
desktop PC to get a comparison.

> Are you running the Nouveau drivers under Linux, or the proprietary
> ones? I've heard the proprietary ones perform much better...
Freedom-hating drivers (Bumblebee variant). They show the exact same
issue as Windows expect for "glxgears" where the nvidia card thumps
along at 880+fps (Intel does 60fps). So something is working.

Reading through the docs it looks like the nvidia card has to do some
pass-through gubbins to get and the lappy's screen, so I might needs to
find a mini-displayport cable and give it a punt on an external monitor
where the nvidia card has direct access.

> FWIW, as of 3.12, Linux now has built in GPU switching support:
> http://kernelnewbies.org/LinuxChanges
Ooooo....that is a little bit awesome.

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