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I am trying to use a new-ish Android TV box with an old projector. The devices in question are an M8 Android media player and an Optoma EP719 projector.

https://www.amazon.ca/gp/product/B00KNL4GLK http://www.projectorcentral.com/Optoma-EP719.htm

The media player is connected to the projector through an HDMI to DVI adapter. The media player is rooted and I have adb access to it over the network. It is running Android 4.4.

The problem I am having is this:

android media player home screen on projector with part of the image duplicated on the right

Part of the image is repeated on the right side. This does not appear in screenshots. I believe this is due to the 16:9 aspect ratio of the resolution. Technically this resolution should work, but in any case my preferred solution (and I hope the easier one) is to set the resolution to 1280x1024. I know this works with my raspberry pi already, though I have a similar distortion when trying to set it to 720p resolution.

The problem is, I can't seem to set the resolution to this value. I am able to select resolutions by going to Settings > Display, toggling HDMI auto-detect off, and picking from a list of HDMI resolutions but neither 1280x1024 nor any other resolutions commonly available for monitors but not televisions are listed. I can choose, e.g., 480p, 720p, and 1080i all of which should work with this projector, but all cause some manner of distortion (usually stretching one side of the screen way out instead of duplicating it).

I've tried to manually set the resolution with a few different apps and via the CLI with wm size as in the related question Change the screen resolution to 1024x768 on Samsung Galaxy S3. This causes the screen to become much smaller than it should be, occupying only a small portion of the screen (e.g. the top left quarter).

I've also tried setprop hw.hdmi.resolution 133 (with 133 being the code for the 1280x1024 resolution, I think) then disconnecting and reconnecting the adapter as suggested in the other related question How to change external screen resolution?. That didn't work either.

Is this possible and, if so, how can I do it? Getting the projector to handle 1280x720 resolution would also be acceptable but I am not sure whether that's a problem on the projector end or the device end.

EDIT: I tried flashing the media player with an OpenELEC image. The same issue occurred even with Kodi's resolution changer. For some reason, it insists on detecting the device as 16:9 even though it reports itself as 4:3.

  • I am having the same problem, have you found a solution? – user181385 Aug 5 '16 at 22:12
  • Unfortunately no. I ended up just using the Raspberry Pi with the projector. – Dylan Aug 5 '16 at 23:54
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I had found a similar situation using a TVbox, a was trying to change the resolution to full HD (1920x1080), the solution was:

  1. Activate the Android as developer mode on TVBOX, via USB to USB cable execute the following command via command prompt:

    adb shell wm size 1920x1080 #To change resolution into FullHD
    

    or

    adb shell wm size 1280x720 #To change resolution into HD
    
  2. Reboot the device (adb reboot)

  • Is it also possible to force a specific refresh rate and colour depth (like 10 bit, for HDR) as well? – kBisla Nov 21 '18 at 9:04
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Instead of changing the resolution change the dpi density of the screen.

use this command to change the dpi

adb shell wm density 240

the lesser dpi the the screen image become tiny and result an image appear similar ultra hi res-monitor

protected by Community Aug 8 at 9:24

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