Set some VGA resolution, leading to LVDS, HDMI can not display

[zhengguang_yang]

processor: i.MX 6Dual/6Quad

Linux:3.14.28

Set some VGA resolution, leading to LVDS, HDMI can not display.

For example:

From EDID you can see the resolution that VGA support as follows:

 cat /sys/class/graphics/fb2/modes:

S:1280x960p-60  
V:1152x864p-75
V:1280x1024p-75
V:1024x768p-75
V:1024x768p-70
V:1024x768p-60
U:832x624p-75
V:800x600p-75
V:800x600p-72
V:800x600p-60
V:800x600p-56
V:640x480p-75
V:640x480p-72
U:640x480p-67
V:640x480p-60
U:720x400p-70
D:1280x1024p-60

Test methods are as follows：

(1)setenv bootargs video=mxcfb0:dev=hdmi,1920x1080M@60,bpp=32 video=mxcfb1:dev=lcd,1280x960M@60,bpp=32

gst-launch-1.0 playbin uri=file:///run/media/sda1/movie/720p/20130614_riddick_trailer2_3008.mp4 video-sink="imxv4l2sink device=/dev/video17 disp-width=1920 disp-height=1080" &
gst-launch-1.0 playbin uri=file:///run/media/sda1/movie/720p/20130614_riddick_trailer2_3008.mp4 video-sink="imxv4l2sink device=/dev/video18"

VGA, hdmi, lvds can play normally 

(2)setenv bootargs video=mxcfb0:dev=hdmi,1920x1080M@60,bpp=32 video=mxcfb1:dev=lcd,1280x1024M@75,bpp=32

gst-launch-1.0 playbin uri=file:///run/media/sda1/movie/720p/20130614_riddick_trailer2_3008.mp4 video-sink="imxv4l2sink device=/dev/video17 disp-width=1920 disp-height=1080" &
gst-launch-1.0 playbin uri=file:///run/media/sda1/movie/720p/20130614_riddick_trailer2_3008.mp4 video-sink="imxv4l2sink device=/dev/video18"

VGA, hdmi, lvds can't play normally

Then, I tested all the resolutions：

S:1280x960p-60      √ 
V:1152x864p-75      √
V:1280x1024p-75     ×
V:1024x768p-75      ×   
V:1024x768p-70      ×
V:1024x768p-60      √
U:832x624p-75         ×
V:800x600p-75      √
V:800x600p-72      √
V:800x600p-60      √
V:800x600p-56         ×
V:640x480p-75      √
V:640x480p-72      √
U:640x480p-67         ×
V:640x480p-60      √
U:720x400p-70      √
D:1280x1024p-60      √

√ means VGA, hdmi, lvds can play normally

× means VGA, hdmi, lvds can't play normally

[igorpadykov]

Hi

please try to test these resolutions with imx-test package (mxc_vpu_test)

www.nxp.com/lgfiles/NMG/MAD/YOCTO/imx-test-5.4.tar.gz

with Linux from

i.MX 6 Series Software and Development Tool|NXP 

Best regards
igor
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[zhengguang_yang]

Hi igorpadykov

Thank you very much for your reply

Now I turn the clock of VGA to the internal clock. LVDS and HDMI all display normally. But it seems that the internal clock doesn't support all the resolution, because when using the internal clock, part of the resolution of the VGA can not be displayed alone.  When using the external clock, all of the resolution of the VGA displayed alone normally.