Hi folks,
In order to add Nvidia Optimus support on Lenovo laptops, I'm trying to
fix the last issues on [1], but I need your help to do some test on
Lenovo's firmware.
On Lenovo Sandy Bridge / Ivy Bridge series the PMH7 register 0x50
controls dGPU power.
Comments on Gerrit show that different bits on different generations are
used.
Please use util/pmh7tool on vendor firmware with Optimus enabled and
graphics driver loaded:
$ ./pmh7tool -r 0x50
To wake the GPU from sleep, you can simply run lspci, or a graphical 3D
application.
It will go back to sleep after a few seconds of idle.
Please report which bits toggle and the device you run tests on.
It will help to add proper Nvidia Optimus support to all Lenovo laptops.
1: https://review.coreboot.org/#/c/coreboot/+/28380/
Regards,
Patrick
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