On Sun, Apr 28, 2019 at 07:26:54PM -0400, Charles wrote:
> Hello list,
> Ever since the new inteldrm driver got merged into -current, shortly
> before the 6.5 release, I'm seeing an odd new behavior on my Thinkpad
> T430 -- when an external display is connected, Xorg blanks all screens
> (but the mouse can still be seen) until I switch to a TTY and back with
> (i.e. C-A-F4 then C-A-F5) after which point it goes back to normal.
> I'm glad the new inteldrm driver got merged, since it fixes several
> other video issues I was having. This problem is very minor since the
> workaround is just a few extra keystrokes when I dock or undock, but it
> is nevertheless annoying.
> Is anyone else experiencing this issue on third gen core-I series Intel
> chips with integrated graphics? Or on any other chips for that matter?
> I checked Xorg.0.log and didn't see anything suspicious. I also tried
> disabling monitor hotplugging via Xorg.conf, but I either did it wrong
> or it had no effect.
> I would attach xorg logs and dmesg, but AFAIK misc@ does not allow
> attachments, and I don't want to annoy people with that much inline
> info.

Does this help?

Index: sys/dev/pci/drm/drm_fb_helper.c
RCS file: /cvs/src/sys/dev/pci/drm/drm_fb_helper.c,v
retrieving revision 1.13
diff -u -p -r1.13 drm_fb_helper.c
--- sys/dev/pci/drm/drm_fb_helper.c     14 Apr 2019 10:14:51 -0000      1.13
+++ sys/dev/pci/drm/drm_fb_helper.c     29 Apr 2019 06:58:25 -0000
@@ -575,6 +575,9 @@ static bool drm_fb_helper_is_bound(struc
 #ifdef notyet
        if (READ_ONCE(dev->master))
                return false;
+       if (!SPLAY_EMPTY(&dev->files))
+               return false;
        drm_for_each_crtc(crtc, dev) {

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