How To Rotate Screen 180 Degrees?

[r4tprize]

Hello,

I purchased the official raspberry pi screen, and one of the cases. The case is OK .. I will be asking more about different cases in another forum post.

My immediate question is this: I assembled the Pi and display from the included instructions, and it displayed and booted on the first try. However, much to my surprise the the display output is upside down, with respect to the feet of the display case. As near as I can tell, there is only one way to attach the legs of the case, so I don't think I can rotate the legs 180 degrees.

So is there an easy (and possibily without programming) way to rotate the output of the Pi LCD display? Thanks in advance for any guidance!

Cheers,
R4TPRIZE

[rpdom]

Put "lcd_rotate=2" in /boot/config.txt and the screen will turn upside-down.

When the original software, cases and everything else was designed for the screen, no one noticed they'd got it the wrong way up. (oops!)

A software fix was put in place to flip it the other way, but some cases had already been designed for it. So the "lcd_rotate=2" option was added to flip the image and touchscreen "upside-down" so it works in those cases.

[rpdom]

The difference is that the viewing angles are slightly better when the screen is the right way up. Otherwise it makes no difference which way up you have it.

[r4tprize]

THANK-YOU! Worked like a charm!

Cheers,
R4TPRIZE

[Barbieboy]

Hello, where do I input this: "lcd_rotate=2" in /boot/config.txt - I can't find it anywhere. Also put the MicroSD in my desktop and still can't find it :/

Thanks,

Marcus

[rpdom]

You have a NOOBS installation. You won't be able to see config.txt on a PC. You could access it from your Pi with "sudo nano /boot/config.txt", or you can use the NOOBS Recovery/Config editor - Press the Shift key when prompted during the boot, then go to the config editor and add that line. Save and exit and reboot.

[Barbieboy]

Many thanks for the advice, but still in the dark on this.

- Holding down SHIFT during boot just leads to the normal desktop regardless of how long its held down.

- Can't find where "sudo nano /boot/config.txt" is within Pi

You have a NOOBS installation. You won't be able to see config.txt on a PC. You could access it from your Pi with "sudo nano /boot/config.txt", or you can use the NOOBS Recovery/Config editor - Press the Shift key when prompted during the boot, then go to the config editor and add that line. Save and exit and reboot.

[lasersrl]

Barbieboy,
When the Raspberry is booted, open the terminal and type:

Code: Select all

sudo nano /boot/config.txt

at the end of the file, you simply add:

Code: Select all

lcd_rotate=2

then save and exit with CTRL+X, Y, Enter key.

Reboot the Raspberry and you've done.

[Ak7w]

Right on. lcd_rotate=2 works like a charm.

Based on this being a known issue (and the prevalence of some of those screen/case combinations) is there any reason that text (with an explanation and commented out by default) couldn't be added to the preloaded config file? It would probably save on new user anxiety about what exactly to add and where to put it.

Just a thought.

[Seagarth]

I'm having the same issue. Is it possible to clarify (for an absolute beginner) exactly where I should be adding lcd_rotate=2 ?
I can access terminal using sudo nano /boot/config.txt and then I am faced with a block of text. The Pimoroni site (where I bought the touchscreen) say that I should add lcd_rotate=2 to the top of this text. Unfortunately, whether I'm adding it to the very top of the very bottom before pressing exit and Y for save, when I reboot the screen is still upside down.

Do I need to slot lcd_rotate=2 into a particular place? Am I missing something really simple here? I have Googled but all instructions tell me to 'simply' add lcd_rotate=2 to the config.txt section.

[alphanumeric]

At the end of the file should be fine. Any line with a # as the first character is treated as a comment and not executed. Remove the # and its acted apon. Just so you know. A lot of what is in that file doesn't do anything.

[Seagarth]

Sorted now, thanks.

[Indieu]

lcd_rotate=2 didn't work for me.

[DougieLawson]

lcd_rotate=2 didn't work for me.

That only works with the official Raspberry Pi Foundation 7" display.
https://www.raspberrypi.org/products/ra ... h-display/

[conrad9900]

I have the offical touchscreen, the lcd_rotate=2 does not work, it reverses the touch input but not the screen rotation

[DougieLawson]

I have the offical touchscreen, the lcd_rotate=2 does not work, it reverses the touch input but not the screen rotation

It works on my RPF display. Picture and touch are both rotated with lcd_rotate=2.
https://thepihut.com/products/official- ... en-display

That shows up as
pi@Challenger:~ $ tvservice -s
state 0x400000 [LCD], 800x480 @ 60.00Hz, progressive
pi@Challenger:~ $

[alphanumeric]

I have the offical touchscreen, the lcd_rotate=2 does not work, it reverses the touch input but not the screen rotation

Raspbian Jessie or Stretch?

[AlexWilsonsBlog]

Ready to pull what is left of my hair out... I have the official display. Tried adding the lcd_rotate=2 line at the top of config.txt, the bottom... it doesn't work.

I am running the latest update to Raspbian. I am relatively new to the Pi and Linux (but not computing). Wanting to learn some new skills and working on a deployable package for my clients to do network monitoring, remote access, and a few other things.

Just need to get this goofy screen rotated so I can use the case properly.

[masterzion]

Ok, it found the reason...

it worked in Jessie

But The GL driver in Stretch is not compatible with "lcd_rotate = 2"
You must disable it.



I had the same issue here
it is some bug.

[BigE]

after reading about 90 different articles (70%) were either outdated or either crashed my pi in the process. I have the adafruit resistive touch 2.8 touch screen and I tried everything, I did: xinput --list to find out my touch screens xinput name and tried to use commands such as display rotate in the boot config files and I even tried to figure out the X11 files (since I heard there is a way to configure the pi to use more memory)

I am about ready to pull my hair out since I wasted about 30 hours for my senior project to do this and ive made next to no progress

[aBUGSworstnightmare]

'lcd_rotate' works on raspberry Pi 7in display only!

lcd_rotate
This flips the display using the LCD's inbuilt flip functionality, which is a cheaper operation that using the GPU-based rotate operation.
For example, lcd_rotate=2 will compensate for an upside down display.

Such a feature is available from the dispalys TCON --> many displays have control inputs for rotating/flipping Image --> changing the scan direction.

What happens when changing LCD scan direction

scan direction.PNG (52.68 KiB) Viewed 94974 times

display_hdmi_rotate
Use display_hdmi_rotate to rotate or flip the HDMI display orientation. The default value is 0.
display_hdmi_rotate
result
0 - no rotation
1 - rotate 90 degrees clockwise
2 - rotate 180 degrees clockwise
3 - rotate 270 degrees clockwise
0x10000 horizontal flip
0x20000 vertical flip

Note that the 90 and 270 degree rotation options require additional memory on the GPU, so these will not work with the 16MB GPU split.
display_lcd_rotate
Use display_lcd_rotate to rotate or flip the LCD orientation. Parameters are the same as display_hdmi_rotate.

display_rotate
display_rotate is deprecated in the latest firmware but has been retained for backwards compatibility. Please use display_lcd_rotate and display_hdmi_rotate instead.
Use display_rotate to rotate or flip the screen orientation. Parameters are the same as display_hdmi_rotate.

Full test is here https://www.raspberrypi.org/documentati ... t/video.md

[Piefurz]

As someone pointed out the look angle is different when the screen is upside down . depending on if you are hand holding it or are naturally looking from a lower angle it may be acceptible but with normal desktop ergonomics it is not. There should be a revision made to correct this before i would buy another. The screen would have to be rotated on the back plate and the ribbon cable re-worked. Doesn't look like an easy DIY mod. Disappointing.

[jamesh]

As someone pointed out the look angle is different when the screen is upside down . depending on if you are hand holding it or are naturally looking from a lower angle it may be acceptible but with normal desktop ergonomics it is not. There should be a revision made to correct this before i would buy another. The screen would have to be rotated on the back plate and the ribbon cable re-worked. Doesn't look like an easy DIY mod. Disappointing.

LCD viewing angles differ, especially on older display such as this. We specifically chose this orientation as the default because it would be the most common use case.

Just use the lcd_rotate or display_lcd_rotate option to rotate the display as required. No reworking required as the Pi can work upside down!

[Piefurz]

Put "lcd_rotate=2" in /boot/config.txt and the screen will turn upside-down.

When the original software, cases and everything else was designed for the screen, no one noticed they'd got it the wrong way up. (oops!)

A software fix was put in place to flip it the other way, but some cases had already been designed for it. So the "lcd_rotate=2" option was added to flip the image and touchscreen "upside-down" so it works in those cases.

So the last post says the screen and orientation was chosen to be that way which makes the look angle better from the bottom than the top. The quote above says it was an oops. Just because it can be flipped in software to correct the oops doesn't mean that is the best fix. Software fixes to hardware problems probable make the processor work harder. Also I am trying to correct a difference in rotation between the screen image and the touch input on an elo touch panel and can't find a fix. I am an AV repair person for 43 years now and I understand that the look angle on landscape screen should be better from the top down with your eyes level with the top of the screen. It is nice to be able to change this for other situations but the default should be that. Also in a portrait mode it is better to have a display with equal visibility from left to right. Although this may be hard to find, especially with touch screens, it allows for flexibility in projects with some landscape and others portrait.

[rpdom]

Just because it can be flipped in software to correct the oops doesn't mean that is the best fix. Software fixes to hardware problems probable make the processor work harder.

It's not a software fix. It instructs the GPU to output in the "correct" format. The CPU has no additional work to do.