Bug 505356 - HDMI Display (TV) cannot wake up from sleep, even when PC actually already woke up
Summary: HDMI Display (TV) cannot wake up from sleep, even when PC actually already wo...
Status: RESOLVED DUPLICATE of bug 466705
Alias: None
Product: kwin
Classification: Plasma
Component: general (other bugs)
Version First Reported In: 6.3.5
Platform: Fedora RPMs Linux
: NOR major
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2025-06-08 22:06 UTC by mohdyusuf
Modified: 2025-06-19 05:46 UTC (History)
2 users (show)

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Description mohdyusuf 2025-06-08 22:06:13 UTC 
SUMMARY
HDMI TV display connected to PC (Fedora 42 + KDE) cannot wake up from sleep.
PC can wake up on mouse + keyboard USB trigger, but TV screen will not show display.
Same hardware works completely fine on Windows 11 (screen can wake up fine).

STEPS TO REPRODUCE
1. Leave PC idle, it goes to sleep. Screen goes to sleep (HDMI).
2. Tap on keyboard, PC wakes up from the sleep.
3.

OBSERVED RESULT
TV shows “hdmi connected” but the screen remained dark.

EXPECTED RESULT
TV screen should wake up. 

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: Fedora 42, kernel 6.14.9-300.fc42.x86_64
KDE Plasma Version: 6.3.5 
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.0

ADDITIONAL INFORMATION
Hardware:
- AMD Ryzen 9 7900
- NVidia RTX 4090 (Gigabyte) - driver version 575.57.08
- Gigabyte B650 Aorus Pro AX
- TV TCL QM8 144hz
Comment 1 mohdyusuf 2025-06-09 17:21:39 UTC 
Small correction to the observed result.

OBSERVED RESULT
TV shows “hdmi connected” but the screen says “No signal.”
Comment 2 John Kizer 2025-06-19 05:46:33 UTC 
Hi - this one appears to be an upstream NVIDIA driver issue. For reference, the most recent NVIDIA documentation on workarounds is located at bullet point 4 of this document: https://download.nvidia.com/XFree86/Linux-x86_64/575.57.08/README/dynamicpowermanagement.html#KnownIssuesAndW6426e

And the NVIDIA forums thread on this topic is located here: https://forums.developer.nvidia.com/t/black-screen-after-pc-wakes-up-from-suspend/304023?u=john.kizer

Thanks!

*** This bug has been marked as a duplicate of bug 466705 ***