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