Screen tearing in pi 4

jigidyjim

I went over to the raspberry pi forums and it sounds like the official move to kernel 5.10 is almost here, so I might just wait for that instead!

senseless

@bluestang

Thanks, I didn't know that. Just dived into the whole retropie world and learning on the job :). Having a blast and dusting off my unix knowledge in the process haha. Good to hear the 5.10 release is coming and waiting for this is probably the best option for now ;).

senseless

@jigidyjim said in Screen tearing in pi 4:

marquee display?

I'm not sure I fully understand your question or that we are talking about the same thing but I use bezels for all my systems and they still work/display during a game.

phos

@senseless

Would you be willing to create and share an IMG of your RetroPie install with KMS? I have followed the instructions from @bluestang as well as instructions elsewhere on the forums and have not been able to get KMS to boot on Pi 4.

If I had a working IMG, I could at least confirm it may be just a conflict between my VGA666 and KMS and not an error on my side.

Thank you, would be quite helpful to myself and others trying to get KMS working.

bluestang

@phos said in Screen tearing in pi 4:

@senseless

Would you be willing to create and share an IMG of your RetroPie install with KMS? I have followed the instructions from @bluestang as well as instructions elsewhere on the forums and have not been able to get KMS to boot on Pi 4.

If I had a working IMG, I could at least confirm it may be just a conflict between my VGA666 and KMS and not an error on my side.

Thank you, would be quite helpful to myself and others trying to get KMS working.

Are you able to test KMS with a regular monitor or TV?

If the problem exists with the VGA666 than you may need to seek help on the Raspberry Pi forums.

phos

@bluestang

I don't have the proper HDMI cable to test, although I could get one.

I made a post detailing my issue. Trying to boot ES after the Pi boot up freezes via SSH only returns an SDL error.

https://retropie.org.uk/forum/topic/29488/working-kms-image-with-newest-retropie-on-pi-4-help-with-config-with-vga666?_=1612231814343

I did also try installing Raspberry Pi OS instead of RetroPie and I also get a freeze on boot up in RPiOS with KMS on. So, it could very well be an issue related to VGA666.

bluestang

@phos said in Screen tearing in pi 4:

@bluestang

I don't have the proper HDMI cable to test, although I could get one.

I made a post detailing my issue. Trying to boot ES after the Pi boot up freezes via SSH only returns an SDL error.

https://retropie.org.uk/forum/topic/29488/working-kms-image-with-newest-retropie-on-pi-4-help-with-config-with-vga666?_=1612231814343

I did also try installing Raspberry Pi OS instead of RetroPie and I also get a freeze on boot up in RPiOS with KMS on. So, it could very well be an issue related to VGA666.

Looks like VGA666 is not supported under KMS yet.

Keep an eye on this PR and when it’s merged give it go:

https://github.com/raspberrypi/linux/pull/4141

jigidyjim

I finally updated to kernel 5.10 now that it has been released officially.

However, I'm still trying to figure out how I can switch to the kms driver, so that I can get rid of my screen tearing.

My problem is that I am using Pi Marquee 2 to power my second display. If I switch to the kms driver, that stops working.

I looked through the source code of Pi Marquee 2, and it looks like it using "omxiv" to display pngs to the second display. And from what I've been reading, omxiv is based on omxplayer, and omxplayer will never be supported on the kms driver. At least, that is my very shallow understanding of the current state of the world.

But really I don't need the video support in all this as I'm not using it at all. All I'm using this for is displaying a simple png to the second display (though the image fades as it switches images are a nice touch!). I'm wondering if anyone knows of a way to do that other than omxiv? if such a program exists that can do that, maybe I'll try editing the python script myself and pointing it at some other program. No idea if it's that simple, but thought I'd ask!

mitu

@jigidyjim said in Screen tearing in pi 4:

I'm wondering if anyone knows of a way to do that other than omxiv?

Try using fbi, it's an image viewer that works on the console also.

jigidyjim

@mitu said in Screen tearing in pi 4:

Try using fbi, it's an image viewer that works on the console also.

Thanks that looks promising. I’ll have to see if there’s a way to control which display it outputs to.