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mslt
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Joined: 24 Oct 2017
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Location: Germany

PostPosted: Mon Oct 29, 2018 10:27 pm    Post subject: nvidia optimus on t430 Reply with quote

Hi there,

I want to use my Thinkpad T430's miniDisplayport for my external Monitor instead of the VGA port. Since the miniDP only works, if I have the NVIDIA GPU enabled I enabled that.
I decided to use the discrete GPU only setting in the BIOS and go with that. But my T430 gets to hot with this setting. So I tried to follow the wiki guide on NVIDIA/Optimus (https://wiki.gentoo.org/wiki/NVIDIA/Optimus) but I fail at the EDID section because in the /lib/firmware/edid/ dir is no .bin file which would be for my display.

Has anybody successfully enabled NVIDIA/Optimus on a T430 and could provide me with a guide?

Thanks in advance.

~mslt
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NeddySeagoon
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Joined: 05 Jul 2003
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PostPosted: Mon Oct 29, 2018 10:47 pm    Post subject: Reply with quote

mslt,

It looks like read-edid can generate the edid.bin file for you.
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NeddySeagoon

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haarp
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Joined: 31 Oct 2007
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PostPosted: Tue Oct 30, 2018 7:14 am    Post subject: Reply with quote

Do you need to provide a custom EDID for your monitor? It won't help cool down the GPU.

Thinkpads with Optimus use the Intel GPU as the main and Nvidia for heavy rendering and external monitors. To be able to dynamically switch the Nvidia on/off when external monitors are connected or not, you need to enable Optimus in the BIOS and choose one of the following:

- Start X on the Intel card, using the intel driver. Then use Bumblebee + intel-virtual-output to transmit images to the Nvidia and attached monitors. Good 3D performance (through optirun), bad external monitor performance (depends on the size, lowres monitors should be fine. i-v-o has very limited bandwidth due to Nvidia drivers sucking huge ****) and quite a number of bugs.

- Start X on the intel card, using the intel or modesetting driver, load the nouveau driver into X aswell. Then use xrandr --setprovideroutputsource nouveau Intel/modesetting to transmit images to the Nvidia and attached monitors. Good external monitor performance (yay), abysmal 3D performance and more waste heat from the GPU than with Nvidia drivers.

In both cases, the Nvidia GPU needs to be running to use external monitors. If the Thinkpad sitll overheats, and you already cleaned the fans from dust, I suggest playing with fancontrol. The "disengaged" level makes the fan spin faster than the hardware fan controller ever would.
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