Minor correction...
Both Scenarios allow the discreet/radeon card to render as expected
however there is a different problem which is visible when you run for
example..
DRI_PRIME=1 chromium_browser &
The window doesn't render unless you resize it couple of times and then the
application
I have managed to get a solution for this issue by following the below
steps
Scenario 1:
1. Set intel to UXA mode and activate radeon DRI3 using the below xorg.conf
settings
2. Restart mdm by login out and loggin in again (I have experience very slow
rendering login page - Linux mint)
3. Issue
I confirm the above findings on latest Linux Mint available kernel
4.4.0.36 however I also noticed
sudo DRI_PRIME=1 glxgears works
whereas
DRI_PRIME=1 glxgears gives a blank screen.
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