On Mon, 2017-08-07 at 14:05 -0700, Jonathan Ryshpan wrote:
[ ... ]
The modesetting driver appears to be installed since it's part of the
xorg-x11-server-Xorg package, which is installed on my system. But
possibly not active. Where are instructions on how to find out whether
it's active and, if necessary, how to activate it?
To list the drivers I do this (please note the "name:" entry):
xrandr --listproviders
Providers: number : 2
Provider 0: id: 0x6f cap: 0xf, Source Output, Sink Output, Source
Offload, Sink Offload crtcs: 3 outputs: 3 associated providers: 1
name:modesetting
Provider 1: id: 0x49 cap: 0xf, Source Output, Sink Output, Source
Offload, Sink Offload crtcs: 6 outputs: 4 associated providers: 1
name:PITCAIRN @ pci:0000:01:00.0
If I'd see no modesetting info from the previous output I'd check
config files in /etc/modprobe.d/ or /etc/default/grub (or wherever) that
switch off modesetting
I didn't find recent docs for Fedora re. this, but here's some info from
Debian pages:
--------------------
To disable KMS for Intel and Radeon cards, either:
Boot with the nomodeset kernel command line parameter. Edit
/etc/modprobe.d/i915-kms.conf or /etc/modprobe.d/radeon-kms.conf
accordingly.
To disable KMS for nVidia cards, either:
Boot with the nomodeset kernel command line parameter. Blacklist the
nouveau kernel module, e.g. with
echo blacklist nouveau > /etc/modprobe.d/blacklist-nouveau.conf
and create a minimal /etc/X11/xorg.conf specifying the desired driver,
e.g. [ ... ]
Setting via Grub
Configuring the KMS via Grub can be done via the
/etc/default/grub config file by doing something similar to the
following: [ .... ]
--------------
The rest at:
https://wiki.debian.org/KernelModesetting
Again: some look to /etc/modprobe.d/ etc. might be useful
This might be useful, too:
https://wiki.debian.org/AtiHowTo
HTH,
Wolfgang