https://bugs.kde.org/show_bug.cgi?id=483240
--- Comment #5 from fililip <t...@nitrosubs.live> ---
I managed to add an option to override this behavior with an environment
variable, LFC finally works as it did before.
diff --git a/src/core/renderloop.cpp b/src/core/renderloop.cpp
index 5e3a74c..de7b7d3 100644
--- a/src/core/renderloop.cpp
+++ b/src/core/renderloop.cpp
@@ -201,10 +201,12 @@ void RenderLoop::scheduleRepaint(Item *item)
if (d->pendingRepaint) {
return;
}
+ bool isEnvVarSet = false;
+ const bool forceKernelLFC =
qEnvironmentVariableIntValue("KWIN_FORCE_KERNEL_LFC", &isEnvVarSet) != 0 &&
isEnvVarSet;
const bool vrr = d->presentationMode == PresentationMode::AdaptiveSync ||
d->presentationMode == PresentationMode::AdaptiveAsync;
if (vrr && workspace()->activeWindow() && d->output) {
Window *const activeWindow = workspace()->activeWindow();
- if (activeWindow->isOnOutput(d->output) && activeWindow->surfaceItem()
&& item != activeWindow->surfaceItem() &&
activeWindow->surfaceItem()->frameTimeEstimation() <=
std::chrono::nanoseconds(1'000'000'000) / 30) {
+ if (activeWindow->isOnOutput(d->output) && activeWindow->surfaceItem()
&& item != activeWindow->surfaceItem() && !forceKernelLFC &&
activeWindow->surfaceItem()->frameTimeEstimation() <=
std::chrono::nanoseconds(1'000'000'000) / 30) {
return;
}
}
--
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