Regression: RX 470 fails to boot with amdgpu.dpm=1 on kernel 6.7+

[Ozgur Kara]

Durmuş <dozaltay at gmail.com>, 22 May 2025 Per, 14:27 tarihinde şunu yazdı:
>
> Hello,
>

Hello,

did you get a message in dmesg from kernel, for example an error like this?

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1106268

The dmesg command will give you an output maybe journalctl output or
mesa (glxinfo) output would also be sufficient because we need to know
which upstream it is affected by.
and thanks for report.

Note: because there are two similar errors i added the necessary
maintainers for upstream.

Regards

Ozgur

> I'm experiencing a critical issue on my system with an AMD RX 470 GPU.
> When booting with recent kernel versions (6.7.x or newer), the system
> fails to boot properly unless I explicitly disable Dynamic Power
> Management (DPM) via the `amdgpu.dpm=0` kernel parameter.
>
> When DPM is enabled (`amdgpu.dpm=1` or omitted, since it's the
> default), the system either freezes during early boot or fails to
> initialize the display. However, using the LTS kernel (6.6.x),
> everything works as expected with DPM enabled.
>
> This seems to be a regression introduced in kernel 6.7 or later, and
> it specifically affects older GCN4 (Polaris) GPUs like the RX 470.
> Disabling DPM allows the system to boot, but significantly reduces GPU
> performance.
>
> Things I’ve tried:
> - Confirmed that the latest `linux-firmware` is installed.
> - Verified correct firmware files exist under `/lib/firmware/amdgpu/`.
> - Tested multiple kernels (mainline and LTS).
> - Using Mesa with ACO (Radeon open driver stack).
> - System boots fine with LTS kernel (6.6.x) + DPM enabled.
>
> System info:
> - GPU: AMD RX 470 (GCN 4 / Polaris)
> - Distro: Arch Linux
> - Kernel (working): linux-lts 6.6.x
> - Kernel (broken): 6.7.x and newer (currently tested on 6.14.6)
>
> Thanks in advance,
> Durmus Ozaltay
>
>
>