On 02/01/2017 12:52 AM, Daniel Vetter wrote:
> On Tue, Jan 31, 2017 at 04:27:14PM -0800, Dave Hansen wrote:
>> I added some printk()s all over and gathered a bit more information
>> about what's going on. It looks like the display doesn't work until the
>> drm connector code cleans up the *old* connector. For some reason, it
>> isn't motivated to do that until I go to the console and back.
>>
>> In this case, the display was connected to DP-4.
>> intel_dp_destroy_mst_connector() got called on it when I switched away,
>> but drm_connector_cleanup() did not get called. Upon switching back
>> DP-3/5/6 get created. One of these *eventually* ends up being
>> "enabled", but is not now. When I switch over to the console,
>> drm_connector_cleanup() finally gets called on the old connector: DP-4
>> and I can switch back to X and I see one of DP-3/5/6 enabled and working.
>>
>> Here are some snippets of dmesg interspersed with what I was doing:
>
> Ok, so the delayed deleting seems to be involved in the bug (and we only
> do that since we recently introduced refcounting for hotplugged
> connectors). The question is who's getting confused, either kernel or X.
> To figure this out, next time things are out of sync, please compare the
> output of
>
> $ xrandr
>
> with what's reported in /sys/class/drm/*/status:
>
> $ grep . /sys/class/drm/card0-DP-*/status
OK, I collected that 4 times:
1. When everything is OK
2. When the DVI is unplugged
3. When the DVI is re-plugged (no output)
4. After I press Ctrl-Alt-F2 (back to OK)
The good vs. bad diff looks like this:
--- xdebug.1485980540.start.log 2017-02-01 12:22:20.328242293 -0800
+++ xdebug.1485980621.dvi-replugged.log 2017-02-01 12:23:41.964241982 -0800
@@ -25,15 +25,6 @@
DP2-1 disconnected (normal left inverted right x axis y axis)
DP2-2 connected primary 1920x1200+0+0 (normal left inverted right x
axis y axis) 518mm x 324mm
1920x1200 60.0*+
- 1920x1080 60.0
- 1600x1200 60.0
- 1680x1050 59.9
- 1280x1024 60.0
- 1280x960 60.0
- 1024x768 60.0
- 800x600 60.3
- 640x480 59.9
- 720x400 70.1
DP2-3 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
@@ -41,5 +32,5 @@
/sys/class/drm/card0-DP-1/status:disconnected
/sys/class/drm/card0-DP-2/status:disconnected
/sys/class/drm/card0-DP-3/status:disconnected
-/sys/class/drm/card0-DP-5/status:connected
+/sys/class/drm/card0-DP-4/status:connected
/sys/class/drm/card0-DP-6/status:disconnected
But it's very interesting that when I unplug the DVI, the xrandr output
does not change. Only the /sys/class/drm/.../status does.
> Another question: What desktop are you using, and if you unplug a screen,
> does that general reconfigure the desktop size to disable that output? The
> zombie connector only sticks around as long as someone is still using it
> in the screen configuration. As soon as the reconfiguration has happened,
> it should go away. You can test this by manually disabling the output when
> it's stuck as on:
>
> $ xrandr --output DP-4 --off
Yep, it does the delayed cleanup. The output still shows up in xrandr
(as an 8x8 display) at this point, but it can at least be turned back on.
xrandr snippet:
Screen 0: minimum 8 x 8, current 8 x 8, maximum 32767 x 32767
So, if I do a pair of these:
xrandr --output DP-4 --off
xrandr --output DP-4 --auto
it does bring the display back consistently.
Screen 0: minimum 8 x 8, current 1920 x 1200, maximum 32767 x 32767
eDP1 connected (normal left inverted right x axis y axis)
1920x1080 60.0 + 59.9
1680x1050 60.0 59.9
1600x1024 60.2
1400x1050 60.0
1600x900 60.0
1280x1024 60.0
1440x900 59.9
1280x960 60.0
1368x768 60.0
1360x768 59.8 60.0
1152x864 60.0
1280x720 60.0
1024x768 60.0
1024x576 60.0
960x540 60.0
800x600 60.3 56.2
864x486 60.0
640x480 59.9
720x405 60.0
640x360 60.0
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP2-1 disconnected (normal left inverted right x axis y axis)
DP2-2 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 60.0*+
1920x1080 60.0
1600x1200 60.0
1680x1050 59.9
1280x1024 60.0
1280x960 60.0
1024x768 60.0
800x600 60.3
640x480 59.9
720x400 70.1
DP2-3 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
/sys/class/drm/card0-DP-1/status:disconnected
/sys/class/drm/card0-DP-2/status:disconnected
/sys/class/drm/card0-DP-3/status:disconnected
/sys/class/drm/card0-DP-5/status:connected
/sys/class/drm/card0-DP-6/status:disconnected
Screen 0: minimum 8 x 8, current 1920 x 1200, maximum 32767 x 32767
eDP1 connected (normal left inverted right x axis y axis)
1920x1080 60.0 + 59.9
1680x1050 60.0 59.9
1600x1024 60.2
1400x1050 60.0
1600x900 60.0
1280x1024 60.0
1440x900 59.9
1280x960 60.0
1368x768 60.0
1360x768 59.8 60.0
1152x864 60.0
1280x720 60.0
1024x768 60.0
1024x576 60.0
960x540 60.0
800x600 60.3 56.2
864x486 60.0
640x480 59.9
720x405 60.0
640x360 60.0
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP2-1 disconnected (normal left inverted right x axis y axis)
DP2-2 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 60.0*+
1920x1080 60.0
1600x1200 60.0
1680x1050 59.9
1280x1024 60.0
1280x960 60.0
1024x768 60.0
800x600 60.3
640x480 59.9
720x400 70.1
DP2-3 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
/sys/class/drm/card0-DP-1/status:disconnected
/sys/class/drm/card0-DP-2/status:disconnected
Screen 0: minimum 8 x 8, current 1920 x 1200, maximum 32767 x 32767
eDP1 connected (normal left inverted right x axis y axis)
1920x1080 60.0 + 59.9
1680x1050 60.0 59.9
1600x1024 60.2
1400x1050 60.0
1600x900 60.0
1280x1024 60.0
1440x900 59.9
1280x960 60.0
1368x768 60.0
1360x768 59.8 60.0
1152x864 60.0
1280x720 60.0
1024x768 60.0
1024x576 60.0
960x540 60.0
800x600 60.3 56.2
864x486 60.0
640x480 59.9
720x405 60.0
640x360 60.0
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP2-1 disconnected (normal left inverted right x axis y axis)
DP2-2 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 60.0*+
DP2-3 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
/sys/class/drm/card0-DP-1/status:disconnected
/sys/class/drm/card0-DP-2/status:disconnected
/sys/class/drm/card0-DP-3/status:disconnected
/sys/class/drm/card0-DP-4/status:connected
/sys/class/drm/card0-DP-6/status:disconnected
Screen 0: minimum 8 x 8, current 1920 x 1200, maximum 32767 x 32767
eDP1 connected (normal left inverted right x axis y axis)
1920x1080 60.0 + 59.9
1680x1050 60.0 59.9
1600x1024 60.2
1400x1050 60.0
1600x900 60.0
1280x1024 60.0
1440x900 59.9
1280x960 60.0
1368x768 60.0
1360x768 59.8 60.0
1152x864 60.0
1280x720 60.0
1024x768 60.0
1024x576 60.0
960x540 60.0
800x600 60.3 56.2
864x486 60.0
640x480 59.9
720x405 60.0
640x360 60.0
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP2-1 disconnected (normal left inverted right x axis y axis)
DP2-2 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 60.0*+
1920x1080 60.0
1600x1200 60.0
1680x1050 59.9
1280x1024 60.0
1280x960 60.0
1024x768 60.0
800x600 60.3
640x480 59.9
720x400 70.1
DP2-3 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
/sys/class/drm/card0-DP-1/status:disconnected
/sys/class/drm/card0-DP-2/status:disconnected
/sys/class/drm/card0-DP-3/status:disconnected
/sys/class/drm/card0-DP-4/status:connected
/sys/class/drm/card0-DP-6/status:disconnected
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