[Bug 219888] amdgpu: Oops connecting HDMI/DVI/DP on HD 7850 (Pitcairn) when connected as secondary GPU

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https://bugzilla.kernel.org/show_bug.cgi?id=219888

--- Comment #3 from Alexandre Demers (alexandre.f.demers@xxxxxxxxx) ---
(In reply to Alexandre Demers from comment #1)
> Since I had not encountered this problem until recently (the HD7850 was
> sitting as the primary GPU until my secondary GPU had to be replaced), I
> tried to inverse the primary GPU (RX 5500 XT) with the secondary GPU
> (HD7850).
> 
> So, when the HD7850 sits as the primary GPU, it still doesn't output any
> video on 6.13.7 and it freezes. 
For precision, when I say "it freezes", I mean the GPUs freeze: no output on
any of the GPUs. However, I still see activity on the front light of the
computer, so the kernel itself is still running.

If I connect the monitor on the RX 5500 XT in this configuration (sitting as
secondary GPU) before booting, the RX 5500 XT works properly until I try to
connect the monitor to the HD7850 (then, no output on any GPU after that).

Alexandre
> 
> However, it works properly on 6.10.2 when sitting as primary (the HD7850
> still doesn't output anything when sitting as the secondary GPU, but it
> doesn't crash. Thus, this seems be a different issue).
> 
> I'll try to narrow it down a bit more to figure out if it was introduced
> between 6.10 and 6.13.

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