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backend/drm: fix "a page-flip is already pending" errors on modeset
When performing a modeset, the DRM backend will request a page-flip event. However frame_pending wasn't set to true, so any subsequent wlr_output_schedule_frame calls would imemdiately trigger a synthetic frame event, asking the compositor to submit a new frame. Committing the new frame fails with "a page-flip is already pending" error in the DRM backend.
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@ -373,6 +373,12 @@ static bool drm_crtc_page_flip(struct wlr_drm_connector *conn) {
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}
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conn->pageflip_pending = true;
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// wlr_output's API guarantees that submitting a buffer will schedule a
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// frame event. However the DRM backend will also schedule a frame event
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// when performing a modeset. Set frame_pending to true so that
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// wlr_output_schedule_frame doesn't trigger a synthetic frame event.
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conn->output.frame_pending = true;
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return true;
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}
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