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I use Linux Mint 18.1 on a PC with (inxi -G output):

Graphics:  Card-1: Intel Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller
           Card-2: NVIDIA GK106 [GeForce GTX 650 Ti Boost]
           Display Server: X.Org 1.18.4 driver: nvidia Resolution: 1920x1080@60.00hz, 1920x1080@60.00hz
           GLX Renderer: GeForce GTX 650 Ti BOOST/PCIe/SSE2 GLX Version: 4.5.0 NVIDIA 375.26

Now, I do not use the GeForce for display; I do use both outputs of my on-board adapter - the VGA and the DVI. xrandr -q says:

$ xrandr -q
Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
VGA-1-1 connected 1920x1080+0+0 510mm x 287mm
   1920x1080     60.00*+
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1024x768      75.08    60.00  
   800x600       75.00    60.32  
   640x480       75.00    60.00  
   720x400       70.08  
HDMI-1-1 connected primary 1920x1080+1920+0 510mm x 287mm
   1920x1080     60.00*+
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1024x768      75.08    60.00  
   800x600       75.00    60.32  
   640x480       75.00    60.00  
   720x400       70.08  
DP-1-1 disconnected
HDMI-1-2 disconnected
DP-1-2 disconnected

I want to rotate my VGA display, yet - it seems I cannot:

$ xrandr --output VGA-1-1 --rotate right
xrandr: output VGA-1-1 cannot use rotation "right" reflection "none"

Why does this happen? I read this question (where the nVIDIA card is used for the output and there's a single adapter), and followed the instructions in the answer; particularly, I added

Option    "RandRRotation" "True"

to my /etc/X11/xorg.conf and restarted, but there was no change.

Notes:

  • I can't rotate the HDMI either.
  • I note that for the two connected adapters the text (normal left inverted right x axis y axis) is missing. I Have this for all adapters (connected, and disconnected). I think that this may mean that both connected adapters lack this functionality. Does it work for the other? – ctrl-alt-delor Dec 31 '16 at 17:52
  • @richard: Both. – einpoklum Dec 31 '16 at 17:55
  • you will have to elaborate on the last comment. It fills my head with ideas, but I know not what it means. Is it an answer to my question “Does it work for the other?” i.e. no both, in which case I don't recognise a problem; An exclamation of the word both in my comment; Or teen-speak for rad, cool, froopy, bad … – ctrl-alt-delor Dec 31 '16 at 18:04
  • Not all combinations of hardware/driver/outputs support rotation. It looks like your combination doesn't. – dirkt Jan 1 '17 at 7:50
  • 1
    @dirkt: Shouldn't all drivers, by this day and age, support rotation? It's not a big deal to do it purely in software with double buffering. – einpoklum Jan 1 '17 at 8:57

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