x250 plugged display ignored

cracauer@ said:
Did you try xrandr?
Click to expand...
No and trying it doesn't wake up the minidisplayport display:
Code: 
$ xrandr
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 16384 x 16384
eDP-1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 277mm x 156mm
   1366x768      59.97*+
   1280x720      59.86    59.74 
   1024x768      60.00 
   1024x576      59.90    59.82 
   960x540       59.63    59.82 
   800x600       60.32    56.25 
   864x486       59.92    59.57 
   640x480       59.94 
   720x405       59.51    58.99 
   640x360       59.84    59.32 
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)

VGA however, gets signal:
Code: 
$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1848, maximum 16384 x 16384
eDP-1 connected primary 1366x768+239+1080 (normal left inverted right x axis y axis) 277mm x 156mm
   1366x768      59.97*+
   1280x720      59.86    59.74 
   1024x768      60.00 
   1024x576      59.90    59.82 
   960x540       59.63    59.82 
   800x600       60.32    56.25 
   864x486       59.92    59.57 
   640x480       59.94 
   720x405       59.51    58.99 
   640x360       59.84    59.32 
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-2 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 478mm x 269mm
   1920x1080     60.00*+
   1600x1200     60.00 
   1680x1050     59.95 
   1400x1050     59.98 
   1280x1024     75.02    60.02 
   1440x900      74.98    59.89 
   1280x960      60.00 
   1152x864      75.00 
   1024x768      75.03    70.07    60.00 
   832x624       74.55 
   800x600       72.19    75.00    60.32    56.25 
   800x450       60.05 
   640x480       75.00    72.81    66.67    59.94 
   720x400       70.08 
HDMI-2 disconnected (normal left inverted right x axis y axis)
 
since recent (14.2-p4) it doesn't connect on boot no more. The display is just as not present.

How can I diagnose this, where to look?
 
found similar https://forums.freebsd.org/threads/external-hdmi-not-detected-intel-hd-graphics-5500.90475/ ; my

Code: 
$ inxi -aG
Duplicate specification "debug-width|debug-y|debug-zy:i" for option "debug-zy"
Graphics:
  Device-1: Intel HD Graphics 5500 driver: vgapci bus-ID: 0:0:2.0
    chip-ID: 8086:1616 class-ID: 0300
  Display: x11 server: X.Org 21.1.18 driver: loaded: intel
    unloaded: modesetting,vesa display-ID: :0 screens: 1
  Screen-1: 0 s-res: 1920x1848 s-dpi: 96 s-size: 509x489mm (20.0x19.3")
    s-diag: 706mm (27.8")
  Monitor-1: eDP-1 res: 1366x768 hz: 60 dpi: 125
    size: 277x156mm (10.9x6.1") diag: 318mm (12.5")
  Monitor-2: HDMI-1 res: 1920x1080 hz: 60 dpi: 102
    size: 478x269mm (18.8x10.6") diag: 548mm (21.6")
  OpenGL: renderer: Mesa Intel HD Graphics 5500 (BDW GT2)
    v: 4.6 Mesa 24.1.7 direct render: Yes

Different externals seem to act differently. Meanwhile one of the externals that used to work does so (again?). Still only when plugged at boot time :-(
 
identical symptoms (Linux) https://unix.stackexchange.com/a/439573

I tried

Code: 
$ sysctl sys.class.drm.card0.status=on
sysctl: unknown oid 'sys.class.drm.card0.status'
$ sysctl sys.class.drm.card0-HDMI-A-1
$ sysctl sys.class.drm.card0-HDMI-A-1=on
sysctl: oid 'sys.class.drm.card0-HDMI-A-1' isn't a leaf node
 
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