On Wednesday, 26 June 2024 01:28:47 BST Dale wrote:

Michael wrote:

The above message indicates the same problem you had experienced before
you
reinstalled. The monitor is not sending its EDID table, or the card can't read it.

Your Xorg sets a default dummy resolution of 640 x 480, because it can't find anything connected to the card.

Things I would try, until someone who can grok nvidia contributes better ideas:

Eliminate the hardware being the cause of the problem, e.g.: try a different cable, different monitor, then try the same card (with same drivers and same kernel settings) on your other PC. If this proves
there's nothing wrong with the cable, card, or kernel settings:

1. Try different ports and restart display-manager each time.

2. Add these two lines at the bottom of /usr/share/sddm/scripts/Xsetup:

xrandr --setprovideroutputsource modesetting NVIDIA-0
xrandr --auto

Again restart display-manager.

3. Add a file /etc/X11/xorg.conf.d/20nvidia.conf

Section "Device"

Identifier "nvidia"
Driver "nvidia"
BusID "PCI:9:0:0"
Option "UseEDID" "false" ## Try this too ##

EndSection

Again restart display-manager.

Every time you try a setting and it doesn't produce the goods, revert it before you try the next thing. Make notes and keep an eye on your logs in case you spot a difference.

If none of these tweaks work, then you can try capturing the EDID table
and creating a file for the card to load.

[snip ...]

I was
even thinking of moving my main rig monitor to the new rig and see what
it did. I'd already tried a different card so didn't see any need in repeating that. Then I had a thought. Why is it saying port DP-3? Why
is it not port DP-0?

Your PC indicated DFP-3 was what it had booted at - from your Xorg.0.log:

[ 44.311] (--) NVIDIA(0): Valid display device(s) on GPU-0 at PCI:9:0:0
[ 44.311] (--) NVIDIA(0): DFP-0
[ 44.311] (--) NVIDIA(0): DFP-1
[ 44.311] (--) NVIDIA(0): DFP-2
[ 44.311] (--) NVIDIA(0): DFP-3 (boot)
[ 44.311] (--) NVIDIA(0): DFP-4
[ 44.311] (--) NVIDIA(0): DFP-5
[ 44.311] (--) NVIDIA(0): DFP-6
[ 44.311] (--) NVIDIA(0): DFP-7

which is the display device connector type nvidia identifies the monitor being connected to. However, then it prints this discouraging message:

[ 44.312] (--) NVIDIA(GPU-0):
[ 44.332] (--) NVIDIA(GPU-0): DFP-3: disconnected <== This ===
[ 44.332] (--) NVIDIA(GPU-0): DFP-3: Internal TMDS
[ 44.332] (--) NVIDIA(GPU-0): DFP-3: 165.0 MHz maximum pixel clock
[ 44.332] (--) NVIDIA(GPU-0):

I thought the first port was the one on the
bottom. Turns out, the top port is the first one. So, I moved the
cable to the first port, DP-0.

I thought you had already tried this prior to reinstalling, when I had suggested to try different ports.

I booted the rig up, started DM, got the
login screen as usual and guess what was next, a complete desktop. I
changed it to not power off or switch to a screensaver so that it would
stay on and I could keep a eye on it. I heated up supper, ate, typing
this reply and it is still running, in 1080P no less.

YES! :-D

Now tell me this, why would it not work on DP-3 or DP-2 when I tried
those earlier on? Does one always have to have a monitor connected to
DP-0 first then others as monitors are added?

It may have something to do with auto-detecting PNP display devices, like DisplayPort monitor devices. There is a HPD pin (Hot Plug Detect) on the DP, which lets the card know if a monitor turns off. This seems to cause the card's driver to detect the display as "disconnected", which then disables the port.

The question is why would the monitor turn off. Well, it might be taking too long for the card to walk from DP-1 to DP-3, by which time the monitor has
gone to sleep to save energy. If the monitor is on DP-1, then it doesn't get
a chance to do this.

Alternatively, the Quadro P1000 video card being a 'pro' graphics card may
have been designed with the assumption a monitor (the primary monitor) is *always* connected on the first port, or else the PC is configured as a headless server - I don't know really.

I think if you capture and feed manually the EDID table to the card's driver, it may work differently - but again, I have no experience with Nvidia. By accident or good fortune I've always had 'linux-friendly' AMD-Radeon cards on my PCs.

One thing I have noticed with my DisplayPort monitor, it needs to be powered
on while the PC boots up/shuts down. If the monitor is switched off it will not get detected after boot and also the shutdown process is cancelled. :-/

Now comes the next question. To move just KDE stuff over, desktop
settings and such. ~/.local and .config. Are those the big ones?

Yes, if we're talking about plasma and kde applications.

You'll also need:

.mozilla
.ssh
.gnupg
.gkrellm2

and others, if you want to keep their settings the same across PCs.

Also, I have a .kde4 directory, that's no longer used right? I think it
died ages ago. I forgot all about that thing.

Last time kde4 was touched on my system was in 2022 - perhaps I changed some theme/panel colors or some such. I thought it was defunct as a directory for some year now:

~ $ ls -la .kde4/share/apps/color-schemes/
total 23
drwxr-xr-x 2 michael michael 3452 Oct 1 2022 .
drwxr-xr-x 3 michael michael 3452 Jun 14 2019 ..
-rw-r--r-- 1 michael michael 3519 Jun 16 2019 Breeze.colors
-rw-r--r-- 1 michael michael 3806 Jun 15 2019 BreezeDark.colors
-rw-r--r-- 1 michael michael 4474 Oct 1 2022 Oxygen.colors

~ $ ls -la .kde4/share/config/
total 11
drwxr-xr-x 2 michael michael 3452 Oct 1 2022 .
drwxr-xr-x 4 michael michael 3452 Jun 14 2019 ..
-rw------- 1 michael michael 3403 Oct 1 2022 kdeglobals

I'll copy the other
stuff over at some point but just want to play with the big stuff at the moment.

In your list, #1 would have been the fix. It also turns out, it was
me. I plugged the cable in the wrong port. No idea why everything else worked fine tho. All the boot media worked just fine. This is a large thread over something so simple. ;-)

Well, if I had more experience with Nvidia, or if you tried each and every
port as I erroneously assumed you had done, it may not have taken this long! ;-)

Thanks so much for all the help. The main rig is still sitting there at 1080P waiting on me. Finally, after over $1,000 spent, days of
installing, twice, and a lot of testing, a working computer. :-D :-D

Dale

:-) :-)

Could you please send me your Xorg.0.log again with a working and powered up monitor, off-list to keep the noise down. I'd be interested to see what it reports now the monitor is connected to DP-1 and initialized correctly.

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