On 4/27/20 4:20 PM, stan via users wrote:
On Mon, 27 Apr 2020 16:33:54 -0000
"Sreyan Chakravarty" <sreyan32@xxxxxxxxx> wrote:
How would you solve this in X ?
Caveat, I have never had to deal with this issue because I have never
had two gpus.
But, here goes. If you want to be sure that only the gpu you desire
runs, you need to ensure that the driver for the other is not loaded,
or the gpu you want to use is explicitly selected. I recall you saying
that you have no way of turning off the intel gpu from the bios. Is
that true? Check at the website of the builder of your laptop, and
maybe ask them if it is possible. That's the simplest solution. No
dice?
The reason you can't turn it off from the bios is likely because that
isn't possible. There obviously aren't separate video out ports for
each device. My understanding of how this works is that the better GPU
(AMD in this case) is used for 3D rendering to a buffer and then that
buffer is copied into the other (Intel) device for outputting to the
display. If you blacklist the i915, you will have no graphics at all.
My question to the OP is why do you want to do this? You can't turn off
the Intel device and using the AMD one is only useful if you're doing
some sort of intensive graphics. So if you really do need that for
something, use the right-click menu option.
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