https://bugs.kde.org/show_bug.cgi?id=501889
Bug ID: 501889
Summary: NVIDIA Driver 570.86.15 Breaks Wayland Display
Restoration on RTX 4070 SUPER with Samsung G95SC -
Fixed by Downgrading to 550
Classification: Plasma
Product: kwin
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: core
Assignee: kwin-bugs-n...@kde.org
Reporter: eschoeller+...@gmail.com
Target Milestone: ---
(also submitted to NVIDIA)
Description:
Under Wayland on Kubuntu 24.10 with NVIDIA driver 570.86.15, turning off and on
a Samsung G95SC monitor (connected via DisplayPort to an RTX 4070 SUPER)
results in a blank screen requiring a TTY switch (TTY3 → TTY1) to restore the
display. The same issue occurs when taking screenshots with Spectacle.
Downgrading to driver 550 (e.g., 550.54.14) resolves both problems, with the
display and screenshots working normally.
Environment:
OS: Kubuntu 24.10 (Plasma 6, Wayland session)
Kernel: [Insert your kernel version, e.g., uname -r output like
6.11.0-9-generic]
GPU: NVIDIA GeForce RTX 4070 SUPER
Driver: 570.86.15 (broken), downgraded to 550 (fixed)
Monitor: Samsung G95SC (OLED, likely 5120x1440 @ 240Hz), DisplayPort connection
Compositor: KWin (Wayland)
Steps to Reproduce:
Boot into a Wayland session on Kubuntu 24.10 with NVIDIA driver 570.86.15.
Connect an RTX 4070 SUPER to a Samsung G95SC via DisplayPort.
Turn the monitor off, then back on after a few seconds.
Result: Blank screen, monitor enters "no signal" countdown. Switching to TTY3
and back to TTY1 restores the display.
Alternatively, open Spectacle and take a screenshot.
Result: Same blank screen, same TTY workaround needed.
Expected Behavior:
Monitor should wake immediately with the desktop visible after being turned
back on.
Screenshots with Spectacle should complete without blanking the display.
Actual Behavior:
With driver 570.86.15, monitor reconnection fails (blank screen, "no signal"
countdown).
Spectacle screenshots trigger the same blank screen.
Logs show Qt apps creating "fake screens" and Wayland globals dropping (e.g.,
qt.qpa.wayland: Creating a fake screen in order for Qt not to crash, foot:
warn: wayland.c:1467: unknown global removed).
Logs (from 570.86.15):
Mar 22 16:54:20 hexoid plasmashell[3846]: qt.qpa.wayland: Creating a fake
screen in order for Qt not to crash
Mar 22 16:55:21 hexoid foot[4011]: warn: wayland.c:1467: unknown global
removed: 0x00000045
Mar 22 16:55:22 hexoid kernel: workqueue: nv_drm_handle_hotplug_event
[nvidia_drm] hogged CPU for >10000us 4 times
(Full logs available if needed—fake screen messages repeat, hotplug warnings
occasional.)
Resolution:
Downgraded to NVIDIA driver 550 (e.g., 550.54.14 via sudo apt install
nvidia-driver-550).
After reboot, monitor wakes instantly, and Spectacle screenshots work without
issues.
Additional Notes:
Tested with nvidia-drm.modeset=1 in GRUB (GRUB_CMDLINE_LINUX_DEFAULT="quiet
splash nvidia-drm.modeset=1"); reduced hotplug warnings but didn’t fix the
issue.
X11 session (Plasma X11) works perfectly with 570.86.15—no blank screen on
monitor wake or screenshots.
Suspect a regression in 570.86.15’s Wayland hotplug/output handling with KWin.
Request:
Please investigate driver 570.86.15’s Wayland compatibility with high-res
monitors like the Samsung G95SC.
Confirm if this is a known issue or fixed in a later release (post-570.86.15).
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