raspistill/raspivid with GL Driver enabled to Full KMS gives no screen preview. - Raspberry Pi Forums

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i cannot monitor preview using raspistill/raspivid when full kms enabled, saved pictures , videos.
perfect preview raspistill/raspivid when fake kms enabled, , files save fine.
monitor 1920 x 1080 hdmi connected directly pi.
no remote ssh, done on pi.
gpu memory set 256 meg.

raspberry pi 3b os info: "raspbian gnu/linux 9 (stretch)"

here information returned when give command: $ glxinfo | grep -i opengl

libgl error: mesa-loader: failed retrieve device information
mesa-loader: failed retrieve device information
mesa-loader: failed retrieve device information
opengl vendor string: broadcom
opengl renderer string: gallium 0.4 on vc4 v3d 2.1
opengl version string: 2.1 mesa 13.0.6
opengl shading language version string: 1.20
opengl extensions:
opengl es profile version string: opengl es 2.0 mesa 13.0.6
opengl es profile shading language version string: opengl es glsl es 1.0.16
opengl es profile extensions:

(as note, have not installed mesa-utils because installed neverball , freecad, , difference between using opengl driver , standard raspian driver obvious. have no reason believe mesa-utils output camera screen.)

here information when give command: $ raspistill -t 5000 -p 0,0,640,480 -v

raspistill camera app v1.3.11
width 2592, height 1944, quality 85, filename (null)
time delay 5000, raw no
thumbnail enabled yes, width 64, height 48, quality 35
link latest frame enabled no
full resolution preview no
capture method : single capture
preview yes, full screen no
preview window 0,0,640,480
opacity 255
sharpness 0, contrast 0, brightness 50
saturation 0, iso 0, video stabilisation no, exposure compensation 0
exposure mode 'auto', awb mode 'auto', image effect 'none'
metering mode 'average', colour effect enabled no u = 128, v = 128
rotation 0, hflip no, vflip no
roi x 0.000000, y 0.000000, w 1.000000 h 1.000000
camera component done
encoder component done
starting component connection stage
connecting camera preview port video render.
connecting camera stills port encoder input port
closing down
close down completed, components disconnected, disabled , destroyed


when issue same command fake kms enabled exact same output, word word. working screen preview.
when revert full kms, no screen preview comes back. repeatable.


absolutely need camera input , full kms projects.

ideas?

also:
xcompmgr newest version (1.1.7-1).
libgl1-mesa-dri newest version (13.0.6-1+rpi2).94936

i'm stumped. don't want go webcam workaround if possible.


raspberrypi



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