* [Bug 219888] amdgpu: Oops connecting HDMI/DVI/DP on HD 7850 (Pitcairn) when connected as secondary GPU
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From: bugzilla-daemon @ 2025-03-16 14:38 UTC (permalink / raw)
To: dri-devel
https://bugzilla.kernel.org/show_bug.cgi?id=219888
Alexandre Demers (alexandre.f.demers@gmail.com) changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|amdgpu: Oops connecting |amdgpu: Oops connecting
|HDMI/DVI/DP on HD 7850 |HDMI/DVI/DP on HD 7850
|(Pitcairn) |(Pitcairn) when connected
| |as secondary GPU
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From: bugzilla-daemon @ 2025-03-16 14:46 UTC (permalink / raw)
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--- Comment #1 from Alexandre Demers (alexandre.f.demers@gmail.com) ---
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.
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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--- Comment #2 from Alexandre Demers (alexandre.f.demers@gmail.com) ---
6.11.0 exhibits the same problem where there is no output. There must a signal
established though, since the monitor doesn't complain about "No signal".
However, the boot process is stuck.
Using the radeon driver works as expected.
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--- Comment #3 from Alexandre Demers (alexandre.f.demers@gmail.com) ---
(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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--- Comment #4 from Alexandre Demers (alexandre.f.demers@gmail.com) ---
6.12.0 was already "Oopsing".
I hadn't checked if 6.11.0 was "oopsing" in the log though before testing
6.12.0, I'll have to check it out later.
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Alexandre Demers (alexandre.f.demers@gmail.com) changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|amdgpu: Oops connecting |amdgpu: Oops connecting
|HDMI/DVI/DP on HD 7850 |HDMI/DVI/DP on HD 7850
|(Pitcairn) when connected |(Pitcairn)
|as secondary GPU |
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--- Comment #5 from Alexandre Demers (alexandre.f.demers@gmail.com) ---
bisecting found out the following culprit:
e6a901a00822659181c93c86d8bbc2a17779fddc is the first bad commit
commit e6a901a00822659181c93c86d8bbc2a17779fddc (HEAD)
Author: Wenjing Liu <wenjing.liu@amd.com>
Date: Wed Apr 17 15:23:08 2024 -0400
drm/amd/display: use even ODM slice width for two pixels per container
[why]
When optc uses two pixel per container, each ODM slice width must be an
even number.
[how]
If ODM slice width is odd number increase it by 1.
Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Acked-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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Alexandre Demers (alexandre.f.demers@gmail.com) changed:
What |Removed |Added
----------------------------------------------------------------------------
Bisected commit-id| |e6a901a00822659181c93c86d8b
| |bc2a17779fddc
CC| |alexdeucher@gmail.com
Kernel Version|6.13.0 |6.11.0
Regression|No |Yes
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--- Comment #6 from Alexandre Demers (alexandre.f.demers@gmail.com) ---
Looking at the commit, this bug probably affects a wider range of GPUs since
DCE12.0 and DCE8.0 rely on the change applied to DCE11.0
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--- Comment #7 from Alexandre Demers (alexandre.f.demers@gmail.com) ---
DCE6's dce60_tg_funcs structure is missing .is_two_pixels_per_container =
dce110_is_two_pixels_per_container
It seems the fix is already in 6.14-rc7.
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--- Comment #8 from Alexandre Demers (alexandre.f.demers@gmail.com) ---
For reference, commit e204aab79e01bc8ff750645666993ed8b719de57
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Alexandre Demers (alexandre.f.demers@gmail.com) changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|amdgpu: Oops connecting |amdgpu: Oops connecting
|HDMI/DVI/DP on HD 7850 |HDMI/DVI/DP on DCE6
|(Pitcairn) |
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--- Comment #9 from Alexandre Demers (alexandre.f.demers@gmail.com) ---
It will be patched in upcoming 6.14, but this should be backported.
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Alexandre Demers (alexandre.f.demers@gmail.com) changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |PATCH_ALREADY_AVAILABLE
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