backend/drm: only request page-flip if active
It doesn't make sense to request a page-flip for a disabled output.
Fixes: 84e727da ("backend/drm: request page-flip event on modeset") Closes: #3528 (closed)
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It doesn't make sense to request a page-flip for a disabled output.
Fixes: 84e727da ("backend/drm: request page-flip event on modeset") Closes: #3528 (closed)