this is the patch in the link above:
diff --git a/src/drmmode_display.c b/src/drmmode_display.c
index 4c66ca7..a848345 100644
--- a/src/drmmode_display.c
+++ b/src/drmmode_display.c
@@ -288,6 +288,7 @@ static void
drmmode_do_crtc_dpms(xf86CrtcPtr crtc, int mode)
{
drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;
+ drmmode_ptr drmmode = drmmode_crtc->drmmode;
ScrnInfoPtr scrn = crtc->scrn;
RADEONInfoPtr info = RADEONPTR(scrn);
CARD64 ust;
@@ -296,6 +297,11 @@ drmmode_do_crtc_dpms(xf86CrtcPtr crtc, int mode)
if (drmmode_crtc->dpms_mode == DPMSModeOn && mode != DPMSModeOn) {
drmVBlank vbl;
+ /* Wait for any pending flip to finish */
+ do {} while (drmmode_crtc->flip_pending &&
+ drmHandleEvent(drmmode->fd,
+ &drmmode->event_context) > 0);
+
/*
* On->Off transition: record the last vblank time,
* sequence number and frame period.
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https://bugs.launchpad.net/bugs/1577170
Title:
[solved] screen cannot be turned back on after being switched off
after some time of inactivity
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