So the connections are made. The only thing left is the graphics driver... and it is 'amdgpu' (Tonga PRO [Radeon R9 285/380]), which the driver is internal in the Linux kernel.
Confirm a few thing for me, that we have tried or not, so we can try other things:
- You have tried the rescue menu to try to boot with safe graphics.
- You have edited the Linux boot line and used 'nomodeset' as a boot parameter
- You have edited the Linux boot line and used 'amdgpu.dc=0' as a boot parameter.
For graphics, you have: Tonga PRO [Radeon R9 285/380]
In current Linux Kernel (where the amdgpu driver is) and Newer AMD graphics, while using the 'amdgpu' driver, DT is needed, so in the newer kernels, DT is set to be on by default. But your card does not support that... So DT on yours, not for your graphics card and older AMD/Radeon GPU's, DT needs to be turned off. It is a translation layer in newer AMD graphics cards, which used to be referred to as DAL.
Your GPU card does not support that... So it should be put into the /etc/default/grub file, line "GRUB_CMDLINE_LINUX_DEFAULT" after quiet splash, add 'amdgpu.dt=0', save/exit, and run 'update-grub'... So that it turns that off for your video card... Try that in this way and see if it helps. If it helps or not for this current problem... It eventually needs to be set this way anyways.
Adv Reply
. I've added the line in my GRUB file and now I can use graphics and desktop environments again. Do you know what could have made DT turn on?
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