Don't know if it can help, but enabling DRI3 solves the problem for me.
Just added this to /usr/share/X11/xorg.conf.d/20-intel.conf :
Section "Device"
Identifier "Card0"
Driver "Intel"
Option "DRI" "3"
EndSection
ad restarted X
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https://bugs.launchpad.net/bugs/1430888
Title:
DRI_PRIME with radeon/intel windows do not draw
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