[Bug 97055] Black screens on A10-8780P (Carrizo) + R7 M260/M265 (Topaz) Combo

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Comment # 15 on bug 97055 from
(In reply to SET from comment #13)
> My HP laptop with AMD A10-7300 (Kaveri iGPU, Topaz dGPU) has a fully working
> X up to kernel 4.9 (not beyond) with these module options applied as such :

Thanks.  I probably went through that particular set of options back when I was
still banging my head against the wall trying to make it work (and tried it
again just now in case it miraculously started working).  It does nothing for
me in 4.9, but may help others.  Right now, turning amdgpu off entirely (via
modprobe.blacklist=amdgpu or nomodeset if compiled in) is the only thing that
reliably works (and thus using efifb instead).  And, in case anyone reading
this thinks otherwise, it's not just X that doesn't work; the console doesn't
work, either (on the rare occasions the console works and stays working, X and
Mesa work as well).  The only thing that consistently works with the amdgpu
driver is the backlight.  The display is still black, and maybe occasionally
will get some stray pixels temporarily lit up during boot, as if the display is
pointing to nonexistent memory.


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