[Bug 100666] amdgpu coolers never stoping linux

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=100666

--- Comment #15 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Luke McKee from comment #14)
> Alex thanks for your help.
> 
> How it gets the rom is probably the same as this shell script using the pci
> method listed on that github link in the last comment.
> 
> # To read ROM you first need to write `1` to it, then read it, and then write
> # `0` to it as described in the documentation. The reason is that the content
> # is not provided by default, by writing `1` to it you are telling the driver
> # to make it accessible.
> CARD_ID=0
> CARD_ROM="/sys/class/drm/card${CARD_ID}/device/rom"
> FILE_ROM="amdgpu-rom.bin"
> 
> echo 1 > $CARD_ROM
> cat $CARD_ROM > $FILE_ROM
> echo 0 > $CARD_ROM
> echo "Saved as ${FILE_ROM}"
> 
> --
> output:
> cat: /sys/class/drm/card0/device/rom: Input/output error
> [Not] Saved as amdgpu-rom.bin

That should generally work for desktop discrete cards.  You need to be root
however.

> 
> Is there any other user-space accessible methods to extract / write the rom
> in Linux? Now only focusing on comparing the pp table to other roms not
> modifying it.

You can read the amdgpu_vbios file in debugfs.  That will dump the copy of the
vbios that the driver is using.

> Maybe the powerplay is an atom-bios issue perhaps. If it's still broken in
> this 4.16-rc1 version I'm trying out now I'll open a ticket.
> 
> For your reference this is the ticket that claims powerplay dpm is fixed in
> newer kernels / dc=1 in 4.15.
> https://bugs.freedesktop.org/show_bug.cgi?id=100443#c37

There's no confirmation that specifically enabling dc fixed it.

Anyway, we are cluttering up this bug with potentially unrelated information. 
Please file a new bug for your issue and we can discuss it there.

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