Imx6ull xrandr rotate TFT 90°

Technical Support
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1

I have to turn the touchscreen 90 ° in real time. With xinput I can turn the touch. But xrandr works only in normal position.

*xrandr --output default --rotation left  
xrandr: output default can not use rotation "left" reflection "none"*

or

*xrandr -o left  
X Error of failed request: BadMatch (invalid parameter attributes)  
   Major opcode of failed request: 139 (RANDR)  
   Minor opcode of failed request: 2 (RRSetScreenConfig)  
   Serial number of failed request: 14  
   Current serial number in output stream: 14*

The application runs with Qt5, but without QML. QML would be a major change and I do not know if the imx6ull is suitable for it.

What options do I have there?

2

hi @rolmen

Welcome to the Toradex Community.

Could you provide the exact version ( uname -r) of the Software of your module? What is your application?

Which carrier board are you using?
Which touchscreen are you using and how is it connected?

Thanks and best regards, Jaski

3

Hello Jaski,

the xrand -v shows:

root @ colibri-imx6ull-00142d60611d: ~ # xrandr -v  
xrandr program version 1.5.0  
RandR extension missing

The Linux was created from the current TORADEX Yocto sources.
Angstrom v2017.12 - Kernel
Colibri-iMX6ULL_estec-image 2.8b4 20181230

The application is a portable measuring device.
I use my own hardware, which is based on the viola board V1.2.
The touchscreen is an EastRising ER-TFT043-3 / ER-TP043-3. The touch is resistive. The connection takes place as with your TFTs (18-bit RGB + TCON)

4

Thanks for this Information. With Qt5 and QML, you can rotate the root window. Its easier than mixing QT and X. Please have a look on these threads:

  1. Rotate Display and Touchscreen by 90 degrees - Technical Support - Toradex Community
  2. Performance gets low after display rotation - Technical Support - Toradex Community

Best regards, Jaski