How to disable the discrete graphics on 16.04?

Question

Before the update to 16.04 I used to use a proprietary driver from AMD only to disable the discrete graphics card. But now, on the newest version of Ubuntu this is not possible (the Catalyst driver cannot be installed for the version of Xorg in the newest release).

I've tried other ways, but with no success. This answer gave no result, though the output of the command looked as if the card had been disabled:

$ lspci -nnk | grep -i vga -A3 | grep 'in use'
    Kernel driver in use: i915

I've tried several other approaches, but each of them to no avail, it was either not working with the 16.04 kernel (4.4.0-22-generic) or something else.

Does anyone know, how can the discrete graphics card be disabled on the latest Ubuntu (16.04)?

Answer 1

Try this for a change :

How can I disable ATI discrete graphic GPU at startup in Ubuntu 14.04 without BIOS?.

Some possible solution at page bottom. In particular, try to pass radeon.runpm=0 to the kernel instead of radeon.modeset=0 .