Android 6 - custom modeline problem

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Android 6 - custom modeline problem

Unread postby ngsebs » Thu Jun 21, 2018 10:42 pm

While I managed to configure a special custom modeline sucessfully in the boot.ini with my latest Android Marshmallow - Odroid C2, I experience some problem with display of its Android Desktop in this very special configuration.

--> The left two thirds of my display shows a correct android desktop while the right one third of the display shows green mist only.

The changes I made in the boot.ini modeline configuration can help to reproduce this problem together with a monitor which supports 3840px wide screen.

# setenv hdmimode "1080p60hz"
setenv hdmimode "custombuilt"

# 3840x1074 29.97 Hz (CVT) hsync: 32.85 kHz; pclk: 159.25 MHz
# Modeline "3840x1074_30.00" 159.25 3840 3960 4344 4848 1074 1077 1087 1096 -hsync +vsync
setenv modeline "3840,1074,159250,32850,30,3840,3960,4344,4848,1074,1077,1087,1096,1,0,1"
setenv customwidth "3840"
setenv customheight "1074"

Do you have a hint if this boot.ini modifications are technically correct and why the android system does not show its full desktop clearly.

Some more results from my testing:
See attached screen foto for impression what I mean with green mist.
If I take a screenshot from within android this green mist is not there, but full width desktop is shown properly.
If I configure odroid ubuntu with same modeline it works fully without any distortion.
Attachments
test-android-wide.png
test-android-wide.png (766.88 KiB) Viewed 247 times
ngsebs
 
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Re: Android 6 - custom modeline problem

Unread postby ngsebs » Tue Sep 11, 2018 3:12 pm

Dear all,

Meanwhile I experience the problem with any 4k Monitor with Android on C2 when I choose any resolution beyond 2160 px width.
Even with original Android boot.ini an manual selection in odroid setup e.g. of 3440x1440 resoution (which fits my monitor).

It seems not to be a HW limitation, because in Ubuntu I will not get this issue even with resolutions beyond 2160 width.

Any hints what I could do to resolve this issue?

Thanks.
ngsebs
 
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Re: Android 6 - custom modeline problem

Unread postby tobetter » Wed Sep 12, 2018 11:46 am

ngsebs wrote:Dear all,

Meanwhile I experience the problem with any 4k Monitor with Android on C2 when I choose any resolution beyond 2160 px width.
Even with original Android boot.ini an manual selection in odroid setup e.g. of 3440x1440 resoution (which fits my monitor).

It seems not to be a HW limitation, because in Ubuntu I will not get this issue even with resolutions beyond 2160 width.

Any hints what I could do to resolve this issue?

Thanks.

I guess, as long as the height of the resolution is lower than 2046 it's not a hardware limitation for 3840 widths. What display device provides the resolution 3840 by 1074?
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Re: Android 6 - custom modeline problem

Unread postby olihey » Fri Sep 14, 2018 9:54 pm

Try the following. Open the Odroid App and change to any NON-native resolution like 1080p60Hz and keep the changes. Now change the resolution to 3440x1440p@60Hz and again keep the changes. Now press "Apply Reboot". That fixed the issue for me. Good luck
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