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Title: How to rotate screen on Unbuntu 18.04? How to set landscape orientation ? [Print This Page]

Author: Maverick_by_ Time: 3/30/2023 22:52
Title: How to rotate screen on Unbuntu 18.04? How to set landscape orientation ?
How to rotate screen on Unbuntu 18.04?I have 800x1280 screen and it have book orientation.
How to set landscape orientation ?

I tryed find Display settings in Ubuntu 18 descktop environment for orientation but found nothing.

Auto rotate screen doesn't works.

How can i change DTS file to do it ?
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Author: zooora111 Time: 3/31/2023 09:43
Hi, this may help: https://wiki.t-firefly.com/en/Fi ... screen-and-rotation

Author: Maverick_by_ Time: 3/31/2023 13:51

zooora111 Posted at 3/31/2023 09:43
Hi, this may help: https://wiki.t-firefly.com/en/Firefly-Linux-Guide/manual_ubuntu.html#multi-screen ...

yes i saw it before, but it's not about SCREEN rotation, it's about touchscreen rotation.

Author: 895816513 Time: 3/31/2023 17:17
Use xrandr command can rotate screen

xrandr --output --rotate <left|right|inverted|normal>

e.g.：
xrandr --output HDMI1 --rotate right

Author: Maverick_by_ Time: 3/31/2023 21:49

895816513 Posted at 3/31/2023 17:17
Use xrandr command can rotate screen

xrandr --output --rotate

I tryed it before and it works fine but It's not a best solution.

I need to add 2nd screen settings 1280x800:
horisontal 1280
vertical 800
I need rotate my screen using DTS file, on the kernel level:

&dsi1{
....
disp_timings1: display-timings {
         native-mode = <&dsi1_timing0>;
         dsi1_timing0: timing0 {
            clock-frequency = <72600000>;//<80000000>;
            hactive = <800>;
            vactive = <1280>;
            hsync-len = <14>; //20, 50,10
            hback-porch = <26>; //50, 56,10
            hfront-porch = <32>;//50, 30,180
                  vsync-len = <8>;//4
                  vback-porch = <20>;//4
                  vfront-porch = <80>;//8
                  hsync-active = <0>;
                  vsync-active = <0>;
                  de-active = <0>;
            pixelclk-active = <0>;
         };
      };

So i need to add 2nd dsi1_timing:

dsi1_timing1: timing1 {
            clock-frequency = ...;
            hactive = <1280>;
            vactive = <800>;
}

So probabaly i need enter new values for
clock-frequency,hactive,vactive,hsync-len,hback-porch,hfront-porch,vsync-len,vback-porch,vfront-porch

Can you help me ? How to do it ?

Author: Liuth Time: 4/1/2023 17:14

Maverick_by_ Posted at 3/31/2023 21:49
I tryed it before and it works fine but It's not a best solution.

I need to add 2nd screen sett ...

Timings are given in the datasheet of a LCD screen, one DSI can only has one group of timings
They are hardware features of a LCD , so you can't just swap hactive and vactive to rotate
The only way is using xrandr

Author: BerryTresler Time: 3/30/2024 15:06
Last edited by BerryTresler In 3/30/2024 15:09 Editor

Maverick_by_ Posted at 3/31/2023 13:51
yes i saw it before, but it's not about SCREEN rotation, it's about touchscreen rotation.

How did you solve it?

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