Thank you for your answer Vishveshwar. I'm using 3.2 Android kernel from TI 
DevKit. I'll try Rowboat Forums. 

On Tuesday, 11 February 2014 12:17:46 UTC+2, Vishveshwar wrote:
>
> On Tuesday, February 11, 2014 3:14:31 PM UTC+5:30, Efecan Yilmaz wrote:
>>
>> Hi,
>>
>> I'm trying to use a 5.7" LCD screen with Beaglebone Black. I connected 
>> the pins and it's working but there is a problem. LCD's resolution is 
>> 640x480 and doesn't have an EEPROM. So Beaglebone is setting itself to its 
>> defualt resolution, which is 1280x720. I'm trying to change the resolution 
>> with:
>>
>> am display-size 640x480
>>
>> But it doesn't realy change the resolution. It just configure the 
>> resolution to look like a 640x480 in a 1280x720 screen. When I look at 
>> dumpsys with:
>>
>> dumpsys window
>>
>> it gives me:
>>
>> DisplayContents:
>>
>> Display: mDisplayId=0
>>
>> *init=1280x720 160dpi* base=640x480 160dpi cur=640x480 .......
>>
>> I think I need to change that init value. I think  that value is being 
>> set by communicating with LCD's EEPROM. Because when I connect a LCD3 Cape 
>> dumpsys window gives init=320x240. Or if LCD doesn't have an EEPROM 
>> Beaglebone set itself to its default resolution. I need to change that 
>> default resolution.
>>
>  
>
>> Is there a adb or shell command I can use? Or should I change something 
>> in kernel?
>>
> That depends on which kernel you are using. If you have the 3.2 android 
> kernel from the TI Android DevKit, you need to tinker with the kernel 
> sources. With the community 3.8 kernel you could get by with passing a 
> kernel parameter.
>
> Do go through the beagleboard and rowboat forums. You would get your 
> answers there.
>
> -Vishveshwar
>

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