# Black screen for a few seconds after exiting fullscreen **URL:** \ **Category:** Linux\ **Created:** [February 16, 2025, 1:54pm UTC](https://forums.developer.nvidia.com/t/black-screen-for-a-few-seconds-after-exiting-fullscreen/323920 "2025-02-16T13:54:36Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![trixxnet](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@trixxnet](https://forums.developer.nvidia.com/u/trixxnet)\ **Post date:** [February 16, 2025, 1:54pm UTC](https://forums.developer.nvidia.com/t/black-screen-for-a-few-seconds-after-exiting-fullscreen/323920/1 "2025-02-16T13:54:36Z")
Im not sure where to go with this issue. Or what is causing it, but I think its either KDE or an Nvidia problem. The problem started around Christmas, when VRR and new drivers and all that came out. I saw another user also had this issue around that time in discord chat for CachyOs. I have an Nvidia RTX 4090, and 2x 4k screens. The monitor im using is an PG42UQ, and it`s 120hz by default. It supports an OC that makes the screen go up to 138hz. When I activate the 138hz, all fullscreen aplications makes the screen turn black for 2-4 seconds after exiting fullscreen. Then it comes back again. Like if I close youtube in fullscreen is an example to it. This is to everything that has an fullscreen. This issue is not there, if I put my screen on 120hz automatic adaptive sync. I tested 2 browsers, Brave and Firefox. Same issue on both. But if I turn off adaptive sync to never on 138hz, the black screen goes away. If I swap between 120hz and 138hz, my system hard crashes, so I need to push the reset button and reboot. For me, its like it struggle to detect my hz in a way. After swapping to 120hz, it also detect my screen as an ultrawide, so i need to change it too 16:9. Been so many major update past months, that I cant pinpoint what is causing the issue. Had a new hard crash. So tried logging that as well under the nvidia-bug.report1.log.gz [nvidia-bug-report.log.gz](https://forums.developer.nvidia.com/uploads/short-url/u7IOh2jEBoRlVLfl2vwP3K2BosH.gz) (1.4 MB) [nvidia-bug-report1.log.gz](https://forums.developer.nvidia.com/uploads/short-url/qGoqMftB11MkzYhpJY4HIJ3mQtM.gz) (827.6 KB) I see more people struggle with this for some reason now in the community. I linked my post and some people comming forward with the same issues. ---
**Author:** ![morgwai666](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/morgwai666/32/393870_2.png) [@morgwai666](https://forums.developer.nvidia.com/u/morgwai666)\ **Post date:** [February 16, 2025, 1:58pm UTC](https://forums.developer.nvidia.com/t/black-screen-for-a-few-seconds-after-exiting-fullscreen/323920/2 "2025-02-16T13:58:00Z")
links to discord posts and [`nvidia-bug-report.log.gz`](https://forums.developer.nvidia.com/t/if-you-have-a-problem-please-read-this-first) would definitely increase chances of someone ever looking into this ;-) Cheers! ---
**Author:** ![johnwinston5556](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@johnwinston5556](https://forums.developer.nvidia.com/u/johnwinston5556)\ **Post date:** [February 8, 2026, 6:30pm UTC](https://forums.developer.nvidia.com/t/black-screen-for-a-few-seconds-after-exiting-fullscreen/323920/4 "2026-02-08T18:30:44Z")
That 2-4 second blackout when exiting fullscreen on the PG42UQ (especially at 138Hz OC) is almost certainly a **DSC (Display Stream Compression) handshake** or a mode switch resync. Since you are pushing 4K at 138Hz, the bandwidth requirement forces the GPU to use DSC. When you exit a fullscreen video (like YouTube), the browser or the compositor (KDE) might be flipping from a “Direct Scanout” mode back to the desktop composition mode. If there is even a slight mismatch in the refresh rate or color depth (e.g., 10-bit vs 8-bit) between the full-screen content and the desktop, the monitor has to drop the signal and handshake again. To isolate if this is a **video codec** issue or a pure **display signal** issue, try this: 1. Open a static, lightweight page like `blacktestscreen.com` or just a blank browser tab. 2. Toggle fullscreen (F11) repeatedly. If you **still** get the 2-4 second black screen on a static page, then it is 100% the monitor renegotiating the signal (likely VRR or DSC re-engaging). If it **only** happens with video content (YouTube/Twitch), then it is likely Firefox/Brave hardware acceleration conflicting with the Nvidia driver’s “Video Color Settings” or G-Sync windowed mode. For now, sticking to 120Hz (native) usually avoids the DSC handshake delay on that specific Asus panel, as the bandwidth is lower. ---
**Author:** ![keinkaihere](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@keinkaihere](https://forums.developer.nvidia.com/u/keinkaihere)\ **Post date:** [February 15, 2026, 8:32pm UTC](https://forums.developer.nvidia.com/t/black-screen-for-a-few-seconds-after-exiting-fullscreen/323920/5 "2026-02-15T20:32:50Z")
I’m on OpenSUSE Leap 16 and I was able to fix this problem on my 160Hz monitor without going down to 120Hz by going into the KDE Display Configuration and turning off Adaptive Sync.