Interfacing DLPDLCR2000 projector with BBB - Tearing issue

[Christophe Cloutier-Tremblay]

Hi dear BBB community,

I'm new to linux.

Here is my setup :

BBB with the image found here : https://debian.beagleboard.org/images/rcn-ee.net/rootfs/bb.org/testing/2017-08-01/lxqt-4gb/

DLPDLCR2000EVM capes that runs trough PARALLEL I/F

I have tearing issue due ton synchronization. The DLPDLCR2000EVM can lock on Vsync from the device but i'm stuck at Vsync=23.5 Hz and no way to change this. My target is 60Hz since the module is expecting a multiple of this. Here is what I've tried so far :

fbset

mode "640x360"

    geometry 640 360 640 360 32

    timings 0 0 0 0 0 0 0

    accel true

    rgba 8/16,8/8,8/0,0/0

endmode

fbset -t 57078 32 32 64 8 7 4

ioctl FBIOPUT_VSCREENINFO: Invalid argument

-Any mode or timing change is refused trough fbset except -g -accell which are all fine

debian@beaglebone:/$ xrandr --verbose

xrandr: Failed to get size of gamma for output default

Screen 0: minimum 640 x 360, current 640 x 360, maximum 640 x 360

default connected 640x360+0+0 (0x269) normal (normal) 0mm x 0mm

        Identifier: 0x268

        Timestamp:  42548

        Subpixel:   unknown

        Clones:

        CRTC:       0

        CRTCs:      0

        Transform:  1.000000 0.000000 0.000000

                    0.000000 1.000000 0.000000

                    0.000000 0.000000 1.000000

                   filter:

  640x360 (0x269)  0.000MHz *current

        h: width   640 start    0 end    0 total  640 skew    0 clock   0.00KHz

        v: height  360 start    0 end    0 total  360           clock   0.00Hz

xrandr -r 60Hz

Rate 60.00 Hz not available for this size

debian@beaglebone:/$ cvt 640 360 60

# 640x360 59.84 Hz (CVT 0.23M9) hsync: 22.50 kHz; pclk: 18.00 MHz

Modeline "640x360_60.00"   18.00  640 664 720 800  360 363 368 376 -hsync +vsync

debian@beaglebone:/$ xrandr --newmode

xrandr: failed to parse '(null)' as a mode specification

Try 'xrandr --help' for more information.

debian@beaglebone:/$ xrandr --newmode "640x360_60" 18.00  640 664 720 800  360 363 368 376 -hsync -vsync

xrandr: Failed to get size of gamma for output default

debian@beaglebone:/$ xrandr

xrandr: Failed to get size of gamma for output default

Screen 0: minimum 640 x 360, current 640 x 360, maximum 640 x 360

default connected 640x360+0+0 0mm x 0mm

   640x360        0.00*

  640x360_60 (0x283) 18.000MHz

        h: width   640 start  664 end  720 total  800 skew    0 clock  22.50KHz

        v: height  360 start  363 end  368 total  376           clock  59.84Hz

debian@beaglebone:/$ xrandr --addmode 0x268 640x360_60

xrandr: Failed to get size of gamma for output default

Any lead on this would be greatly appreciated.

Christophe