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Trying to start Xorg on a vanilla bullseye on rpi4

Hi,

I have a vanilla installation of debian bullseye on a rpi4

But I cannot get X to start with two 4K screens attached.


The error (entire log below) is
[   707.980] (II) modeset(0): Output HDMI-1 connected
[   707.980] (II) modeset(0): Output HDMI-2 connected
[   707.980] (II) modeset(0): Using spanning desktop for initial modes
[   707.980] (II) modeset(0): Output HDMI-1 using initial mode 3840x2160 +0+0
[   707.980] (II) modeset(0): Output HDMI-2 using initial mode 3840x2160 +3840+0
[   707.980] (==) modeset(0): Using gamma correction (1.0, 1.0, 1.0)
[   707.980] (==) modeset(0): DPI set to (96, 96)
[   707.980] (II) Loading sub module "fb"
[   707.981] (II) LoadModule: "fb"
[   707.981] (II) Loading /usr/lib/xorg/modules/libfb.so
[   707.982] (II) Module fb: vendor="X.Org Foundation"
[   707.982]    compiled for 1.20.11, module version = 1.0.0
[   707.982]    ABI class: X.Org ANSI C Emulation, version 0.4
[   707.983] (II) UnloadModule: "fbdev"
[   707.983] (II) Unloading fbdev
[   707.983] (II) UnloadSubModule: "fbdevhw"
[   707.983] (II) Unloading fbdevhw
[ 707.999] (EE) Fatal server error: 
[   707.999] (EE) AddScreen/ScreenInit failed for driver 0
[ 707.999] (EE) [ 707.999] (EE) 

Which doesn't really tell me a lot...

If I start with one screen connected and then plug in the other then I
get a mirrored display whan I start the second output with xandr. But
any attempt to use xrandr to move them fails.



root@test17:~# xrandr --output HDMI-2 --mode 3840x2160 --panning 3840x2160+0+0
root@test17:~# xrandr
Screen 0: minimum 320 x 200, current 3840 x 2160, maximum 7680 x 7680
HDMI-1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 600mm x 340mm
   3840x2160     27.26*+  30.00    25.00    24.00    29.97    23.98
   2560x1440     59.95
   1920x1080     60.00    59.94    30.00    29.97
   1920x1080i    60.00    59.94
   1600x900      60.00
   1280x1024     60.02
   1280x800      59.91
   1280x720      60.00    59.94
   1024x768      60.00
   800x600       60.32
   720x480       60.00    59.94
640x480 60.00 59.94 HDMI-2 connected 3840x2160+0+0 (normal left inverted right x axis y axis) 600mm x 340mm 
   3840x2160     27.26*+  30.00    30.00    25.00    24.00    29.97    23.98
   2560x1440     59.95
   1920x1080     60.00    60.00    59.94    30.00    24.00    29.97    23.98
   1920x1080i    60.00    59.94
   1600x900      60.00
   1280x1024     60.02
   1280x800      59.91
   1280x720      60.00    59.94
   1024x768      60.00
   800x600       60.32
   720x480       60.00    59.94
   640x480       60.00    59.94


root@test17:~# xrandr --output HDMI-2 --mode 3840x2160 --panning 3840x2160+3840+0
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  7 (RRSetScreenSize)
  Serial number of failed request:  35
  Current serial number in output stream:  36
root@test17:~#


Does anyone have any ideas of what I need to do to get this working?

Even just being able to start X without having to unplug a screen would be a
start.

Tim.
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