NVIDIA Dual display lag

_112 · 2021-02-11 21:17:09

When using dual displays. There is major lag happening on the screen mouse is stuttering etc almost like the refresh rate has been set to 5hz. But when I disabled my second screen in nvidia-settings. All turns back to normal. It's hard to explain what happens but I have linked a video to show what happens here

Logs Here using command "lspci > log.txt && lsusb >> log.txt && journalctl -b -0 >> log.txt && cat log.txt | curl -F 'f:1=<-' ix.io "

I am using the latest version of the Linux kernel and Nvidia drivers supplied by arch.

seth · 2021-02-11 22:17:01

Please post your xorg log (after adding - and removing if you want - the second output)

_112 · 2021-02-11 22:58:07

Here is the log Started with both outputs went to 1 then back to 2

seth · 2021-02-12 15:42:12

There's no stale modesetting control (the driver is properly unloaded) and the outputs are identical.
The video doesn't suggest a compositor (the full composition pipeline is btw. active for a dual display anyway) but raises the question whether this is limited to the input device: do eg. videos or xscreensaver hacks play w/ proper framerate or are they limited as well?
Do you get excessive CPU load in this situation?

_112 · 2021-02-13 05:43:16

Um, I don't really understand that reply. The issues happen on a clean install of just Nvidia drivers and the WM. No screensavers nothing. I don't think I have the DRM kernel mode setting added. And there is no excessive CPU load when it happens. I assume the Nvidia driver is loaded because with 1 monitor its working fine no issues

seth · 2021-02-13 08:43:13

It's a recap of your xorg log and the request to try the behavior on something that produces frequent output at an expected frequency >> 5Hz to ensure that this is not restricted to the input (ie. that it's not a problem with the display but that the pointer actually jumps between positions)

_112 · 2021-02-13 10:41:11

I don't really know how to test it. I have tried other DP ports (I have 3) and all of them do the same. I could try 1 HDMI and 1 DP. But the issues only happens with 2 monitors connected. With 1 no matter what port the issue doesn't occur

seth · 2021-02-13 10:43:03

Play a video or run glxgears or whatever. Does that stutter too?

_112 · 2021-02-13 11:13:33

Yes glxgears does stutter and so does video. But the glxgears shows its running at normal fps in the console output

_112 · 2021-02-13 13:47:43

Here is a video showing glxgears running https://www.youtube.com/watch?v=LqDdMBW7XLk ALso I testing with 1 DPI and 1 HDMI and the HDMI cable screen runs smooth. But the DP cable screen is still having the issues as before.

So it goes

DP + DP = Both lag
DP + HDMI = HDMI smooth, DP lag
1 DP = Smooth
1 HDMI = Lag

Last edited by _112 (2021-02-13 13:55:20)

seth · 2021-02-14 08:30:30

The thing certainly has a 6/8-pin connector for dedicated power supply. Did you feed that?
If yes, does the same happen w/ the LTS kernel?

_112 · 2021-02-14 18:17:36

All power pins are connected. Using windows there is no trouble with the card. I have tested it with LTS kernel also with kernel version 4.19.175 and still the issue persists

seth · 2021-02-14 20:13:02

_112 wrote:

Using windows

See the third link in my signature.
(The only reason is that this is weird and a hibernating windows will have weird effects, there's no strong argument that it's the cause)

_112 · 2021-02-15 11:09:22

Tried still the same issue. Windows isn't even on the drive Linux is on. Grub is installed on the Linux drive not the windows drive also. I think I should make an issue on the Nvidia forums. As I think this is a driver issue

seth · 2021-02-15 13:25:30

Windows isn't even on the drive Linux is on.

ftr, that's irrelevant.
The hibernating system leaves the HW in an undefined state - the physical location of the installation doesn't matter.

As I think this is a driver issue

Possibly.
Did you check whether nouveau shows the same behavior?

_112 · 2021-02-15 14:36:33

Nouveau doesn't cause an issue. So I think it's the Nvidia drivers

Arch Linux

#1 2021-02-11 21:17:09

NVIDIA Dual display lag

#2 2021-02-11 22:17:01

Re: NVIDIA Dual display lag

#3 2021-02-11 22:58:07

Re: NVIDIA Dual display lag

#4 2021-02-12 15:42:12

Re: NVIDIA Dual display lag

#5 2021-02-13 05:43:16

Re: NVIDIA Dual display lag

#6 2021-02-13 08:43:13

Re: NVIDIA Dual display lag

#7 2021-02-13 10:41:11

Re: NVIDIA Dual display lag

#8 2021-02-13 10:43:03

Re: NVIDIA Dual display lag

#9 2021-02-13 11:13:33

Re: NVIDIA Dual display lag

#10 2021-02-13 13:47:43

Re: NVIDIA Dual display lag

#11 2021-02-14 08:30:30

Re: NVIDIA Dual display lag

#12 2021-02-14 18:17:36

Re: NVIDIA Dual display lag

#13 2021-02-14 20:13:02

Re: NVIDIA Dual display lag

#14 2021-02-15 11:09:22

Re: NVIDIA Dual display lag

#15 2021-02-15 13:25:30

Re: NVIDIA Dual display lag

#16 2021-02-15 14:36:33

Re: NVIDIA Dual display lag

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