From 4565de368c4aecdd4f09fafd69ca59206744aabb Mon Sep 17 00:00:00 2001
From: Lyude Paul <cpaul@redhat.com>
Date: Mon, 13 Jun 2016 15:31:02 -0400
Subject: [PATCH xserver 6/8] modesetting: Clear drmmode->fb_id before
unflipping
[fix copied from 40191d82370e in xf86-video-ati]
Without this, we end up setting rotated CRTCs back to their previous
framebuffer right after we perform a rotation. Reproducer:
- Have two monitors connected at the same resolution
- Rotate one monitor from normal straight to inverted
- Watch as the monitor you didn't rotate either freezes or shows intense
flickering
Signed-off-by: Lyude <cpaul@redhat.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
hw/xfree86/drivers/modesetting/present.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/hw/xfree86/drivers/modesetting/present.c b/hw/xfree86/drivers/modesetting/present.c
index d65c8c8..9a596de 100644
--- a/hw/xfree86/drivers/modesetting/present.c
+++ b/hw/xfree86/drivers/modesetting/present.c
@@ -626,6 +626,15 @@ ms_present_unflip(ScreenPtr screen, uint64_t event_id)
if (!crtc->enabled)
continue;
+ /* info->drmmode.fb_id still points to the FB for the last flipped BO.
+ * Clear it, drmmode_set_mode_major will re-create it
+ */
+ if (drmmode_crtc->drmmode->fb_id) {
+ drmModeRmFB(drmmode_crtc->drmmode->fd,
+ drmmode_crtc->drmmode->fb_id);
+ drmmode_crtc->drmmode->fb_id = 0;
+ }
+
if (drmmode_crtc->dpms_mode == DPMSModeOn)
crtc->funcs->set_mode_major(crtc, &crtc->mode, crtc->rotation,
crtc->x, crtc->y);
--
2.7.4