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I'm setting up Ubuntu 18.10 one step at a time on my Jumper EZPad Mini 3, a cheap Chinese Windows tablet. I've already made it to initial usable status (WiFi/BT works) and now I'm testing multi-display functionalities. In doing this I've hit a kinda unique problem.

This tablet, like many other Chinese 8-inchers, seems to have a portrait-configured/mounted(?) display - the boot logo, the BIOS GUI, GRUB, etc. all display in portrait. After booting into the OS it also stays portrait, until I turn autorotation on, which enables the screen to correctly rotate to landscape. However, the screen resolution shown in Settings is still portrait (800x1280). Manually setting a landscape resolution (e.g. 1280x800), either via Settings or via xrandr, locks up the tablet and turns the display black, forcing me to reboot with the REISUB key combo.

xrandr output under portrait:

Screen 0: minimum 320 x 200, current 800 x 1280, maximum 8192 x 8192
DSI-1 connected primary 800x1280+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   800x1280      60.01*+
   1280x800      59.99    59.97    59.81    59.91  
   1280x720      60.00    59.99    59.86    59.74  
   1024x768      60.04    60.00  
   960x720       60.00  
   928x696       60.05  
   896x672       60.01  
   1024x576      59.95    59.96    59.90    59.82  
   960x600       59.93    60.00  
   960x540       59.96    59.99    59.63    59.82  
   800x600       60.00    60.32    56.25  
   840x525       60.01    59.88  
   864x486       59.92    59.57  
   800x512       60.17  
   700x525       59.98  
   800x450       59.95    59.82  
   640x512       60.02  
   720x450       59.89  
   700x450       59.96    59.88  
   640x480       60.00    59.94  
   720x405       59.51    58.99  
   684x384       59.88    59.85  
   680x384       59.80    59.96  
   640x400       59.88    59.98  
   576x432       60.06  
   640x360       59.86    59.83    59.84    59.32  
   512x384       60.00  
   512x288       60.00    59.92  
   480x270       59.63    59.82  
   400x300       60.32    56.34  
   432x243       59.92    59.57  
   320x240       60.05  
   360x202       59.51    59.13  
   320x180       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)

...and under landscape:

Screen 0: minimum 320 x 200, current 1280 x 800, maximum 8192 x 8192
DSI-1 connected primary 1280x800+0+0 right (normal left inverted right x axis y axis) 0mm x 0mm
   800x1280      60.01*+
   1280x800      59.99    59.97    59.81    59.91  
   1280x720      60.00    59.99    59.86    59.74  
   1024x768      60.04    60.00  
   960x720       60.00  
   928x696       60.05  
   896x672       60.01  
   1024x576      59.95    59.96    59.90    59.82  
   960x600       59.93    60.00  
   960x540       59.96    59.99    59.63    59.82  
   800x600       60.00    60.32    56.25  
   840x525       60.01    59.88  
   864x486       59.92    59.57  
   800x512       60.17  
   700x525       59.98  
   800x450       59.95    59.82  
   640x512       60.02  
   720x450       59.89  
   700x450       59.96    59.88  
   640x480       60.00    59.94  
   720x405       59.51    58.99  
   684x384       59.88    59.85  
   680x384       59.80    59.96  
   640x400       59.88    59.98  
   576x432       60.06  
   640x360       59.86    59.83    59.84    59.32  
   512x384       60.00  
   512x288       60.00    59.92  
   480x270       59.63    59.82  
   400x300       60.32    56.34  
   432x243       59.92    59.57  
   320x240       60.05  
   360x202       59.51    59.13  
   320x180       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)

Plugging an external monitor in, it defaults to Joined mode and ignores autorotation, which resets the main display back to portrait. In this case I can follow the instructions outlined in this answer to manually apply a rotation to the main display, making it usable.

Mirror mode is a different story though. The resolutions available are all landscape, and choosing any will presumably set that resolution on the main display, freezing the tablet/display.

Based on the situation, is there a way I can get mirror mode working properly? Furthermore (optional), can I configure Ubuntu so it somehow recognizes the display as landscape-mounted?

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