Vr not working on Xiaomi RedMi 5 Plus (18:9 device)

[Bonfi96]

Summary: The vr view is not working correctly on my 18:9 device.
The vr view is shown like in any other device, the problem is that the L and R images are too far apart and they will never merge in a 3d image once the headset is worn

Found using:

• Google VR SDK version: v1.130.0
• Unity version: 2017.3.0f3
• Phone manufacturer, model, and O/S version: xiaomi redmi 5 plus with nougat
• Viewer manufacturer & model: Normal cardboard viewer, works fine on other devices

Steps to reproduce the issue:

1. Run any gvr project in vr

Workarounds:

Additional comments:
I also noticed the situation is similar to the youtube app, the issue is the same as probably the underlying tech is the same

[jdduke]

Can you post a screenshot?

[jdduke]

It's possible that the issue is related to the device misreporting the actual screen DPI, which would impact the distortion and prevent stereo convergence. Would you mind posting the result of the following command:

adb shell dumpsys display | grep mBaseDisplayInfo

[Bonfi96]

Here's a screen and the command output

mBaseDisplayInfo=DisplayInfo{"Built-in Screen", uniqueId "local:0", app 1080 x 2160, real 1080 x 2160, largest app 1080 x 2160, smallest app 1080 x 2160, mode 1, defaultMode 1, modes [{id=1, width=1080, height=2160, fps=60.000004}], colorMode 0, supportedColorModes [0], hdrCapabilities android.view.Display$HdrCapabilities@a69d6308, rotation 0, density 440 (397.565 x 449.704) dpi, layerStack 0, appVsyncOff 1000000, presDeadline 16666666, type BUILT_IN, state OFF, FLAG_SECURE, FLAG_SUPPORTS_PROTECTED_BUFFERS}

[jdduke]

Nothing about the screenshot would indicate issues with convergence. Are you saying that only the Cardboard headset has problems? Is it impossible to converge, or just difficult?

[Bonfi96]

I had a 16:9 phone (stolen yay) and currently a 18:9 phone (headset configured properly with the same qr code), I used to develop using the old one and everything was fine, could focus without issues. Now with the new phone both gvr unity apps and the youtube app share this same issue, it always look like it's going to work but L & R images are always too far apart for the brain to merge them

[Bonfi96]

I did a test right now, I took my screen and scaled it to 16:9, viewing the screen from the device the 3D effect is properly working.
This brings me to think that the app is stretching the view to fit 18:9 while at the same time breaking the effect

[jdduke]

It's also possible that the reported DPI isn't the true DPI, which could yield the stretched visuals you're seeing.

Is there any way you can measure just the physical display area so we can check if the reported DPIs are in the right ballpark?

[Bonfi96]

136x68 mm = 5.36x2.68 inches

[rusmaxham]

Can you run adb shell dumpsys display | grep mBaseDisplayInfo in both 16:9 and 18:9 modes and share that here?

[Bonfi96]

The 18:9 results are posted above, I can't run it on the 16:9 device as I dont' have it anymore

[jdduke]

Yeah, it looks like the device is misreporting the (portrait) vertical DPI (actual: 402, reported: 449), which could cause stretching of the horizontal visuals when in landscape.

What is the device name as reported by adb shell getprop ro.product.device? We might consider adding a static override for the DPI, though it'd be nice to avoid that. Does the device offer any kind of custom Display settings you can fiddle with?

[Bonfi96]

The device name reported is vince
Weirdly enough it's working fine with other apps, some of them do work okay, some do not. Is there any chance it could be related to the apps using vertical or horizontal dpi?
As far as I can tell the app built with unity gvr is running in portrait mode when in vr, maybe that can be changed in the manifest?
Sadly there are no settings I can't fiddle with, not even in the dev settings, and root is not an option :(

[jdduke]

The device is likely reporting the wrong DPI to ensure compatibility with apps that use 16/9 assets (16/9 == (18/9 * 400/450), where 450 is the misreported DPI). This probably works fine for some apps, as you say, but not for others (and not with Cardboard).

[Bonfi96]

...so apps that should work correctly on 18:9 end up not working correctly.
I'll try to contact xiomi about the problem and see if they can do anything about it

[hariprakash1901]

@Bonfi96 any update from xiaomi? Did you manage to contact them?