Poor quality starting page after switch the display from HDMI to DVO2

jiang lv

Hi,all

I'm porting Android to custom board based on DM8168 processor. I'm using rowboatTI81xxWithMultimediaAcceleration version . After some modification for my board, system boots fine, the default resolution through HDMI is 1920x1080.I changed that initial 1080p resolution to 800x480 for my LCD display by below steps:

1.open rc.syslink

2.insert following command before /system/bin/sgx/rc.pvr start

echo 0 > /sys/devices/platform/vpss/graphics0/enabled

echo 1:dvo2 > /sys/devices/platform/vpss/graphics0/nodes

fbset -fb /dev/graphics/fb0 -g 800 480 800 480 32

echo 1 > /sys/devices/platform/vpss/graphics0/enabled

3.at the end of flie add below commands:

echo 0 > /sys/devices/platform/vpss/graphics0/enabled

echo 0 > /sys/devices/platform/vpss/display1/enabled

echo triplediscrete,rgb888,0/0/1/1 > /sys/devices/platform/vpss/display1/output

echo 33264,800/210/26/20,480/22/13/10,1 > /sys/devices/platform/vpss/display1/timings

echo 1 > /sys/devices/platform/vpss/display1/enabled

echo 1 > /sys/devices/platform/vpss/graphics0/enabled

after that boot the system, everything works fine, but the starting page is the poor quality compare with the original from HDMI.

Dose any body know how to solve this issue ? I doubt the colour setting may cause the issue but I don't know how to modify, please help me.

over 13 years ago

0 jiang lv over 13 years ago

Prodigy 110 points

anyone can help me, this is a urgent issue ,thanks

0 Liran Ritkop102360 over 13 years ago in reply to jiang lv

Intellectual 300 points

I encounter the same problem! If i will find a solution i will reply here.. Please tell me if you succeed to figure it out.. :-)

0 Brijesh Jadav over 13 years ago in reply to Liran Ritkop102360

TI__Guru**** 476905 points

How is this LCD connected to EVM? What interface does it support? What is the color space used in LCD?

Thx,

Brijesh

0 Liran Ritkop102360 over 13 years ago in reply to Brijesh Jadav

Intellectual 300 points

The LCD id 5.0′′ display area contains 800(RGB) x 480 pixels. The interface of the LCD is RGB 24 bits.

It is connected to the EVM at the same lines as the Evaluation Kit was connected - To Vout0 pins.

0 Brijesh Jadav over 13 years ago in reply to Liran Ritkop102360

TI__Guru**** 476905 points

what issue are you seeing? Is it the colors not correct? or they are artifacts on the display? Which applicaiton are you using to confirm the display? Can you FbDev sample application to check if the colors bar is ok?

Thx,

Brijesh

0 Liran Ritkop102360 over 13 years ago in reply to Brijesh Jadav

Intellectual 300 points

Well. The are two issues.

First, When i run the sample Bars application, when the colors are on one side, the screen is jumping very fast, and the colors are not clear:

. When the colors change side, there are no 'jumpings', but there is a margin of different color at the side of the scrreen:

The second issue is that on the Qt application i want to run on the device, I see low resolution in the PNG pictures and the same colors problem as mention above.

0 Liran Ritkop102360 over 13 years ago in reply to Liran Ritkop102360

Intellectual 300 points

Well...

The bad margins at the side of the screen were result of bad physical connection to the board.

The story with the bad resolution (Green glowing pixels and bad resolution is not fixed yet) as jiang lv encountered is another story, I can't seem to fix it. What's wrong? Someone?

0 jiang lv over 13 years ago in reply to Liran Ritkop102360

Prodigy 110 points

we finally fixed this issue.

This issue is because the hardware bad connection flex,after we change the new flex, all the colour shows normal.

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Poor quality starting page after switch the display from HDMI to DVO2