i.Mx6Q frame buffer 2 issue

daonamthai — Sat, 13 Sep 2014 03:27:45 GMT

Hello everyone,

I got some issues with fb2.

Step 1: Show ring buffer infomation about mxc

dmesg | grep mxc_sdc

output:

mxc_sdc_fb mxc_sdc_fb.0: register mxc display driver lcd

mxc_sdc_fb mxc_sdc_fb.1: register mxc display driver hdmi

mxc_sdc_fb mxc_sdc_fb.2: register mxc display driver ldb

mxc_sdc_fb mxc_sdc_fb.3: register mxc display driver ldb

that mean hdmi is port is mapped to frame buffer 1

Step 2: Show frame buffer infor

cat /sys/class/graphics/fb1/modes

Output:

U:240x320p-60

Maybe, it's strange

I also checkout fb2 mode

cat /sys/class/graphics/fb2/modes

Output:

V:1280x1024p-60

V:1024x768p-60

U:1280x720p-120

U:1280x720p-100

U:1920x1080p-30

U:1920x1080p-25

U:1920x1080p-24

U:1920x1080p-50

U:1440x576p-50

U:1440x288p-50

U:1280x720p-50

U:720x576p-50

U:1920x1080p-60

U:1440x480p-60

U:1440x240p-60

U:1280x720p-60

U:720x480p-60

U:640x480p-60

I guess fb2 is frame buffer for hdmi port

Step 3: I rebuild fb-test app to test frame buffer

fb 0 worked well. We can display image on LCD and DVI port at the same time.(DVI and LCD use IPU1_DISP0)

fb 1 or 2 did not work. No thing displayed on screen

Test procedure

export DISPLAY=:2 //(or 0,1) export fb to user space ???

echo 0>/sys/class/graphics/fb2/blank //unblank screen

./fb-test 2 //run test application with fb2

My system

uname -a

Linux devel 3.0.35 #805 SMP Thu Apr 24 17:12:39 IDT 2014 armv7l GNU/Linux

what's is wrong in here?

Thank all,

Thaidao

Re: i.Mx6Q frame buffer 2 issue

alejandrolozan1 — Wed, 17 Sep 2014 16:30:21 GMT

Hi,

I would like to test the same application and debug the issue. Can you tell me where I can get it?

Alejandro

Re: i.Mx6Q frame buffer 2 issue

daonamthai — Tue, 23 Sep 2014 03:36:49 GMT

Hi,

I followed this link to study frame buffer:

OpenEmbedded/Video_Out – Gateworks.

Then, you can install git and download source code by below link

https://github.com/prpplague/fb-test-app

You must change makefile configuration depend on your host system.

Note: Makefile will create some applications in sample time.

Sincerely,

Thaidao

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