<div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, May 11, 2020 at 9:22 AM Stephen Worthington <<a href="mailto:stephen_agent@jsw.gen.nz">stephen_agent@jsw.gen.nz</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On Mon, 11 May 2020 07:00:40 -0400, you wrote:<br>
<br>
>Now that I have the GT 1030 working in Xubuntu 20.04 with the Nvidia-440 <br>
>driver, most things like Mythtv are working great.<br>
><br>
>However, I can't seem to keep the display at 1920x1080@60hz. It wants to <br>
>switch back to 4K which is the EDID or automatic choice by default.<br>
><br>
>So on boot it uses the /etc/X11/xorg.conf file that the Nvidia X server <br>
>setting program created to force it to 1080p. But if I switch the AV <br>
>Receiver away for some period of time from the computer port to DVD <br>
>player or anything else and then switch back to the computer it comes <br>
>back as 4K like it forgot how it booted. If I switch away for a short <br>
>time like 3-5 minutes it comes back in 1080p as I want.<br>
><br>
>I'm thinking Ubuntu is getting an event triggered by the switching back <br>
>to computer port of the AVR and using auto settings for the display. If <br>
>I run Nvidia X server app at this point the configuration settings are <br>
>in auto instead of 1920x1080@60. I can either change it again or reboot.<br>
><br>
>Or, the display power management mode is getting in the way. I had it <br>
>in Presentation mode and Display power management off. I'm running a <br>
>test now where Presentation mode is off, but I turned on the Display <br>
>power management but set the timer settings to 'never'. I see if that works?<br>
><br>
>Anyone know what's happening?<br>
><br>
>Jim A<br>
<br>
I do not get problems like that since my TV is only 1080p. When I<br>
play a 4k file, the GPU scales it down to 1080p nicely.<br>
<br>
As a workaround, you can use xrandr from a command prompt to switch<br>
the mode manually back to the one you want, maybe something like<br>
"xrandr 60" which would work on my system to put it into 1080p@60Hz.<br>
<br>
I think that if you want it to never go to 4k you will need to do some<br>
more xorg.conf setup to specify the allowed modes, rather than just<br>
the mode at startup. But if you prevent it from going to 4k modes,<br>
then if you want to play a 4k video file, it will scale it down to<br>
1080p which is a complete waste of your 4k TV.<br>
<br>
So maybe you should be considering actually getting it to use 4k mode,<br>
but changing the DPI settings so that text is readable. I had to do<br>
that for my TV:<br>
<br>
Section "Device"<br>
Identifier "Nvidia GT1030"<br>
Driver "nvidia"<br>
Option "DPI" "100x100"<br>
Option "NoLogo" "1"<br>
EndSection<br></blockquote><div><br></div><div>great suggestion on changing the DPI. My problem with leaving the card in 4K mode is the AV Receiver is only 4K@30 hz capable. I think I've found my problem though. Seems to be a bunch of places that Screen locking and sleeping is controlled in Xubuntu. I think I've found them all. A few days testing will prove it or not.</div><div><br></div><div>Jim A</div><div> </div></div></div>