[Bug 110674] Crashes / Resets From AMDGPU / Radeon VII

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110674

--- Comment #109 from Tom B <tom at r.je> ---
Created attachment 145080
  --> https://bugs.freedesktop.org/attachment.cgi?id=145080&action=edit
dmesg with amdgpu.dpm=2

> Tom B., did you try booting with amdgpu.dpm=1 or amdgpu.dpm=2 (default is generally -1 for automatic)? Seems like one of those might enable the new experimental SW SMU v11 feature on Vega20 . . .

Now that is interesting.dpm=-1 is the same as default, and default is 1,
enabled so dpm=1 is what we've been using all along. But dpm=2 and the patch
you linked to are interesting.

I tried it, it didn't help the crashing issue and I was stuck at 30w. As soon
as I started sddm the system froze. I've attached my dmesg from amdgpu.dpm=2
boot. It doesn't fix the issue but it does help answer a few questions I had:


1. The functions in vega20_ppt.c are used with this new patch so that answers
my question from earlier, that's what this file is for and why it contains
similar/identical functions.

2. It explains the difference I found in comment 97: This commit
https://github.com/torvalds/linux/commit/94ed6d0cfdb867be9bf05f03d682980bce5d0036
has the new else block for smu_display_configuration_change which we now know
is the software version of this function.


More importantly, though, knowing that enabling DPM causes the crash, this
tells us either:

A) The bug is present in both versions of the vega20 code: vega20_hwmgr.c and
vega20_ppt.c or..

B) The card reaches an invalid state before DPM is initialised and the card is
fine until it receives a DPM change.

Given that two different versions of the code produce the same result, my hunch
is that the problem is B. The card is not in a state where it's able to receive
power changes.

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