i.mx6 gstreamer corrupted video on 1366x768 18bpp LVDS output

[Filippo]

Hi all,

maybe I'm loosing something big, but I can't run gstreamer/gplay on a 1366x768 lvds 18bpp panel.

I have an lcd connected to LVDS0 on a custom i.MX6 board.

X runs fine and QT / SDL too.

With both kernel 3.0.35 and 3.10.17 I find that gstreamer displays wrong colors and looses sync when I do a simple gst-launch videotestsrc ! mfw_v4lsink.

Videos played with gplay has the same errors.

The very first impression is that both gstreamer and gplay run at 24bpp.

In ldb.c I've added the lines:

	{
	/* VGA 1366x768 85.5M pixel clk output */
	"VGA-WXGA", 60, 1366, 768, 11696,
	213, 70,
	24, 3,
	143, 3,
	FB_VMODE_NONINTERLACED,
	FB_MODE_IS_DETAILED,},

I see the correct parameters on kernel command line from /proc/cmdline and the display is correctly selected in ldb_disp_init.

I've tried to change almost all parameters for the video timings, with no luck.

On a 1024x768 or 800x480 LVDS everything runs fine.

Any ideas about this ?

Cheers,

Filippo

[Filippo · Accepted solution]

Well, problem solved.

The H resolution should be mysteriously 1368 instead of 1366, so the exact timing is:

	{
	/* VGA 1366x768 83.5M pixel clk output */
	"LVDS-1366X768", 60, 1368, 768, 13642,
	200, 72,
	3, 22,
	128, 6,
	FB_VMODE_NONINTERLACED,
	FB_MODE_IS_DETAILED,},

I've tested it on a 3.0.x kernel, but I think on the 3.10.x is the same.

Regards