connector VGA-1: drmModePageFlip failed: Device or resource busy

[yuki0iq]

Sway version

• sway version 1.10-dev-4d4c88f0 (Jul 23 2024, branch 'master') from AUR
• wlroots-git 0.19.0.r7131.015bb8512-1 from AUR
• Linux reimu 6.10.1-arch1-1 #1 SMP PREEMPT_DYNAMIC Wed, 24 Jul 2024 22:25:43 +0000 x86_64 GNU/Linux
• default config
• nouveau videodriver with NVC9 (Fermi) card

Description

Recently I started noticing a lot of errors in logs that happen only if the display is powered off.

00:00:10.920 [ERROR] [wlr] [backend/drm/legacy.c:175] connector VGA-1: drmModePageFlip failed: Device or resource busy
00:00:10.920 [ERROR] [sway/desktop/output.c:280] Page-flip failed on output VGA-1

Steps to reproduce:

sudo dmesg -C # Clear kernel logs
echo 0x19F | sudo tee /sys/module/drm/parameters/debug # Enable verbose DRM logging
sudo dmesg -w >dmesg.log & # Continuously write DRM logs to a file, in the background
sway -c/etc/sway/config -d >sway.log 2>&1 # Reproduce the bug, then exit sway
# super + enter: open foot
# swaymsg output VGA-1 power off
# (wait about 20 seconds)
# swaymsg output VGA-1 power on
# swaymsg exit
fg # Kill dmesg with Ctrl+C
echo 0 | sudo tee /sys/module/drm/parameters/debug # Disable DRM logging

dmesg.log sway.log

[pablo-888]

in my case these happen at random when using firefox or chromium on intel (it's probably not specific to those. they just happen to be the programs i use the most).

I just launch sway with WLR_DRM_NO_ATOMIC to make them go away

[emersion]

Duplicate of https://github.com/swaywm/sway/issues/8442