Display Lag when Screen Sharing

[astralchan]

• Sway Version:
  sway version 1.7

• Debug Log: (sway -dV > sway.log 2>&1)
  sway.log

• Configuration File:
  config

• Stack Trace:
  N/A (not a crash)

• Additional Info:

  • OS: Gentoo (x86_64) musl-hardened overlay
  • GPU: Nvidia Geforce GTX 1080
  • Driver: nouveau (x11-drivers/xf86-video-nouveau-1.0.17)
  • gui-wm/sway USE flags: tray wallpapers
  • pipewire version: media-video/pipewire-0.3.56
  • xdg-desktop-portal version: sys-apps/xdg-desktop-portal-0.14.6
  • xdg-desktop-portal-wlr version: gui-libs/xdg-desktop-portal-wlr-0.5.0
  • How sway is started:

#!/bin/sh

export WLR_NO_HARDWARE_CURSORS=1
export QT_QPA_PLATFORM=wayland
export SDL_VIDEODRIVER=wayland
export XDG_SESSION_TYPE=wayland
dbus-run-session sway -dV

• Description:
  Whenever I screenshare, the window is extremely slow. Input is lagged and key presses are duplicated. Whenever the screenshare is stopped, performance is back to normal.

• Attempted Fixes:

  • Issue 7118 looks to be due to unsupported driver. However, my card (nv130) is listed in the nouveau feature matrix as supported. Plus, I don't see any errors with that in the log above.
  • Issue 5610 describes an issue with a card without support. The nv130 card I use is supported.
  • Issue 82 setting WLC_BG to 0 does nothing

[zsolt-donca]

I know that this is not a fix, but you could try setting a low value to the max_fps setting of xdg-desktop-portal-wlr. It could help with input lag (see emersion/xdg-desktop-portal-wlr#66).

[astralchan]

I know that this is not a fix, but you could try setting a low value to the max_fps setting of xdg-desktop-portal-wlr. It could help with input lag (see emersion/xdg-desktop-portal-wlr#66).

putting

[screencast]
outputname=
max_fps=10

into ~/.config/xdg-desktop-portal-wlr/config doesn't change anything. It might also be worth noting that the same lag occurs with the grim screenshot utility.

[rjonczy]

@astralchan I am wondering if you were able to fix that somehow? I am having similar issue.

[astralchan]

@astralchan I am wondering if you were able to fix that somehow? I am having similar issue.

No, I was never ever to solve the issue. I ended up running a qemu / virt-manager instance of windows 11 and capturing from there.

[JoshuaKir]

@rjonczy Any chance you found a fix? I've been stumped on this for hours

[JoshuaKir]

Hi @zsolt-donca, I am experiencing the same issue except I am running more recent portals and pipewire, and I am on AMD hardware. Would you recommend I open a separate issue on the wlr portal page or is there an ongoing issue I can tag along with?

[edu-vi]

Same issue with hyperland btw, amd hardware

[JoshuaKir]

Same issue with hyperland btw, amd hardware

Forgot to give an update! I didnt have a cpu freq governor set up and i also installed GameMode. This seems to have fixed my issues. unfortunately im in the process of moving right now so i dont have my computer set up to give better details. Hope this helps, best of luck!