Re: X driver -- sna vs uxa

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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

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