On Wed, Oct 02, 2019 at 09:53:21PM -0500, Douglas R. Reno wrote:
>
> Good evening folks
>
> I found the following things out while looking online for solutions to this
> problem earlier. It seems to be due to the way that permissions are handled
> on card0, since AMDGPU/ATI drivers need access to a kernel function that is
> only available if you are root. The Intel and Nouveau drivers don't use
> modesetting in the way that AMD/ATI cards do.
>
> https://ch1p.io/blog/1/ (WARNING: The Security Certificate expired on 10/1.
> The site and the links within (attached) are safe.)
> https://stackoverflow.com/questions/29708596/drmdropmaster-requires-root-privileges
> https://github.com/gch1p/drm_master_util
> https://f.ch1p.io/fnHHUx0b/rootless_modesetting_1.20.3.patch
>
> From what I gather, the patch puts a call out over a file descriptor and
> socket to spawn a suid wrapper indirectly, which only affects AMD cards. I'm
> not 100% sure if my interpretation is correct though, since this is all so
> complex...
>
> - Doug
I'll be trying this later (as well as fixing up my build) - at the
moment the picasso is ploughing on through my normal desktop
packages, and the machine with the R600 is about to be testing some
new DRAM.
The hack is actually for Xorg's own modesetting driver, but if it
also fixes things for ati/amdgpu then all will be good.
ĸen
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