rotating a display

[Eric Sokolowsky]

You can use the old style of options to rotate the screen:

DISPLAY=:0 xrandr -o left

On Fri, Dec 20, 2019 at 7:51 AM djh <xorg at howorth.org.uk> wrote:

> I've just attached a display to a Pi 3B+. It's an old display attached
> through a VGA-HDMI converter (no idea whether that's relevant!). I've
> also attached a USB keyboard, though not yet a mouse.
>
> I want to run the display in portrait mode. When I booted it came up
> sideways (in landscape mode) as I expected. I started trying to use
> xrandr via ssh to configure the display but haven't figured out how to
> get it to work. Here's a sample of some output:
>
> $ xrandr -display :0 --prop
> xrandr: Failed to get size of gamma for output default
> Screen 0: minimum 1280 x 1024, current 1280 x 1024, maximum 1280 x 1024
> default connected 1280x1024+0+0 0mm x 0mm
>         non-desktop: 0
>                 supported: 0, 1
>    1280x1024      0.00*
> $ xrandr -display :0 --output 'default' --rotate left
> xrandr: output default cannot use rotation "left" reflection "none"
>
>  I searched but haven't found any articles that explain my problem. So I
>  thought I'd try lxrandr instead. That pops up a dialog box on screen
>  saying "Unable to get monitor information!" and prints an error on the
>  command line:
>
> $ lxrandr --display :0
> Can't open display
>
> Somebody then told me how to rotate it 'the pi way', by
> editing /boot/config.txt  That worked, but I'd like to understand why
> the X way doesn't. I'm also unable to access the display remotely. From
> my ssh session on the pi I can launch xeyes for example:
>
> $ DISPLAY=:0 xeyes
> ^C  # terminate from keyboard
>
> and I turned off access control:
>
> $ DISPLAY=:0 xhost +
> access control disabled, clients can connect from any host
>
> But I can't connect to the pi from another host:
>
> $ DISPLAY=RpiBplus:0 xeyes
> Error: Can't open display: RpiBplus:0
> $ ping RpiBplus
> PING RpiBplus.fritz.box (192.168.1.22) 56(84) bytes of data.
> 64 bytes from RpiBplus.fritz.box (192.168.1.22): icmp_seq=1 ttl=64
> time=0.314 ms
> $ DISPLAY=192.168.1.22:0 xeyes
> Error: Can't open display: 192.168.1.22:0
>
> I'd appreciate any suggestion for places to look to explain this
> mystery to me, or actual solutions of course :)
>
> Thanks, Dave
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