[RndTbl] recommendations for 4k video card under Linux

Gilles Detillieux grdetil at scrc.umanitoba.ca
Tue May 1 11:06:52 CDT 2018

On 04/30/2018 11:31 PM, Trevor Cordes wrote:
> On 2018-04-30 Gilles Detillieux wrote:
>> That's the thing. I'm not sure exactly which driver it's using. What
> Must be nouveau as none of the major distros ship the nvidia binary
> running by default AFAIK.
> lsmod | grep -P 'nouveau|nvidia'
> Will reveal the truth.  The only way it can't be one of the two is if
> it's Wayland and Wayland doesn't use nouveau (which I have zero
> knowledge about either way (purposely)).

Well, duh, why didn't I think of using lsmod. Thanks! Definitely nouveau 
is running:

# lsmod | grep -P 'nouveau|nvidia'
nouveau              1662531  8
video                  24538  1 nouveau
mxm_wmi                13021  1 nouveau
i2c_algo_bit           13413  1 nouveau
drm_kms_helper        176920  1 nouveau
ttm                    99555  1 nouveau
drm                   397988  7 ttm,drm_kms_helper,nouveau
i2c_core               63151  5 
wmi                    19086  2 mxm_wmi,nouveau

Not sure why it's so non-verbose as far as logging, though, and whether 
that can be controlled.

>> says "(II) glamor: OpenGL accelerated X.org driver based." That
> Oh, forget what I just said about Wayland.
> Glamor should sit on top of nouveau.  Nouveau does a decent amount of
> hw acceleration now too, it's just the super-modern fancy stuff it
> won't do (like vdpau last I checked).  If you want super low-CPU
> accelerated video, vdpau is awesome.

Yeah, no, Wayland is a whole other world I have yet to begin exploring, 
and I may delay the journey for as long as I can. As for vdpau, given 
the lack of feedback in the X logs, I can't tell if it's there or not. 
It's not showing up in lsmod, if it's supposed to appear there. Anyway, 
not too worked up about performance for this application.

>> gain voltage resolution on the Y.) The trick is once you have the
>> display configured properly for your login account, you need to copy
>> that to GDM's configuration:
> I'm using lightdm, but it probably has a similar setup, I'll check it
> out, thanks!  I figured it was a matter of the dm being too early in
> the sequence to know what the user has selected (part of the problem
> of randr being configured per-user rather than per-system like the
> good ol' xorg.conf days).  Since I only reboot once every few months
> (whenever a CVE pops up that actually applies to me), it's not high on
> my priority list. :-)

cp /home/<username>/.config/monitors.xml /var/lib/lightdm/.config/

is supposed to do the trick based on what I read 
The xrandr hacks appear to be deprecated.

Gilles R. Detillieux              E-mail: <grdetil at scrc.umanitoba.ca>
Spinal Cord Research Centre       WWW:    http://www.scrc.umanitoba.ca/
Dept. of Physiology and Pathophysiology, Rady Faculty of Health Sciences,
Univ. of Manitoba  Winnipeg, MB  R3E 0J9  (Canada)

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