Displaylink second screen stuck on low resolution - Raspberry Pi Forums

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model: raspberry pi 3 model b
os: raspbian stretch desktop, kernel v 4.9.41-v7+
issue: desktop shows on both displays. hdmi main display (lg) on 1600x1050. stuck on 800x600 second monitor (asus) via usb displaylink (dvi vga), despite 1600x900 supported , working fine other oses/adapters...

xorg conf

code: select all

   section "device"         identifier      "allwinner a10/a13 fbdev"         driver          "fbturbo"         option          "fbdev" "/dev/fb0"         option          "swapbufferswait" "true" endsection section "device"         identifier      "usb displaylink"         driver          "fbturbo"         option          "fbdev" "/dev/fb1" option "shadowfb" "off"        option          "swapbufferswait" "true" endsection section "monitor" identifier "lg" endsection  section "monitor" identifier "asus" endsection  section "screen" identifier "screen" device "usb displaylink" monitor "asus"  subsection "display"         modes "1600x900"     endsubsection endsection section "screen" identifier "screen1" device "allwinner a10/a13 fbdev" monitor "lg" endsection  section "serverlayout" identifier "default" screen 0 "screen1" 0 0 screen 1 "screen" leftof "screen1" endsection
xorg log:

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[  2225.234] (ii) fbturbo(1): using backing store heuristics [  2225.239] (ii) fbturbo(1): can't load 'g2d_23' kernel module [  2225.239] (ii) fbturbo(1): failed enable use of sunxi display controll er [  2225.239] (ii) fbturbo(1): no sunxi-g2d hardware detected (check /dev/disp d /dev/g2d) [  2225.239] (ii) fbturbo(1): g2d hardware acceleration can't enabled [  2225.239] (ii) fbturbo(1): enabled vfp/neon optimizations [  2225.239] (==) fbturbo(1): backing store enabled [  2225.239] (==) fbturbo(1): dpms enabled [  2225.239] (ii) fbturbo(1): failed enable hardware cursor [  2225.239] (ii) fbturbo(1): no 3d acceleration because driver has been com piled without libump [  2225.239] (ii) fbturbo(1): if wrong , needs fixed, please che ck ./configure log [  2225.239] (==) randr enabled [  2225.260] (ii) selinux: disabled on system [  2225.263] (ii) aiglx: screen 0 not dri2 capable [  2225.263] (ee) aiglx: reverting software rendering [  2225.365] (ii) iglx: enabled glx_mesa_copy_sub_buffer [  2225.367] (ii) iglx: loaded , initialized swrast [  2225.367] (ii) glx: initialized driswrast gl provider screen 0 [  2225.367] (ii) aiglx: screen 1 not dri2 capable [  2225.367] (ee) aiglx: reverting software rendering [  2225.370] (ii) iglx: enabled glx_mesa_copy_sub_buffer [  2225.372] (ii) iglx: loaded , initialized swrast [  2225.372] (ii) glx: initialized driswrast gl provider screen 1
ideas? need recompile kernel enable fb displaylink again or ...?

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