Commit bb9128fd authored by Qiang Yu's avatar Qiang Yu Committed by Michel Dänzer

present: disable page flip only when a slave crtc is active

This prevents the tearing of moving window in a composite WM
desktop when output slave is attached but none of its crtc is
really active.
Signed-off-by: default avatarQiang Yu <>
Reviewed-by: Michel Dänzer's avatarMichel Dänzer <>
parent 45e0eb4b
......@@ -117,6 +117,18 @@ present_flip_pending_pixmap(ScreenPtr screen)
return screen_priv->flip_pending->pixmap;
static Bool
present_check_output_slaves_active(ScreenPtr pScreen)
ScreenPtr pSlave;
xorg_list_for_each_entry(pSlave, &pScreen->slave_list, slave_head) {
if (RRHasScanoutPixmap(pSlave))
return TRUE;
return FALSE;
static Bool
present_check_flip(RRCrtcPtr crtc,
WindowPtr window,
......@@ -145,7 +157,7 @@ present_check_flip(RRCrtcPtr crtc,
return FALSE;
/* Fail to flip if we have slave outputs */
if (screen->output_slaves)
if (screen->output_slaves && present_check_output_slaves_active(screen))
return FALSE;
/* Make sure the window hasn't been redirected with Composite */
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