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 command: DRI_PRIME=1 glxinfo|grep "OpenGL"( you will see the Radeon 
renderer active)
4. Issue command: DRI_PRIME=1 cairo_dock& (cairo starts without problems)

PS: grub kernel were left its distro's default settings.

Section "Device"
        Identifier "Radeon"
        Driver "intel"
                Option "AccelMethod" "UXA"
                Option "SwapbuffersWait" "false"
                Option "VSync" "false"
                Option "DRI" "3"
EndSection

Section "Device"
        Identifier "Radeon"
        Driver "radeon"
                Option "SwapbuffersWait" "false"
                Option "TearFree" "false"
                Option "DRI" "3"
EndSection


Scenario 2:
=======================
1. Set intel to SNA mode and activate radeon DRI3
2. Restart mdm by login out and loggin in again (screen rendering is fast)
3. Issue command: DRI_PRIME=1 glxinfo|grep "OpenGL"( I can only see the Intel 
tenderer)
4. Issue command: DRI_PRIME=1 cairo_dock& (cairo starts without problems)


I hope this helps

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1581270

Title:
  Hybrid Graphics: [drm:si_resume [radeon]] *ERROR* si startup failed on
  resume

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1581270/+subscriptions

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