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

[Durmuş]

i added debug option and this is where to stuck

On Fri, May 30, 2025, 23:29 Alex Deucher <alexdeucher at gmail.com> wrote:

> On Thu, May 22, 2025 at 11:10 AM Durmuş <dozaltay at gmail.com> wrote:
> >
> > Hello,
> >
> > 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.
>
> Are you still having an issue with newer kernels?  E.g., 6.14 or 6.15?
>  I haven't seen any problems with polaris boards here.  If 6.6.x
> works, but 6.7 does not, can you bisect?
>
> Alex
>
> >
> > 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
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/amd-gfx/attachments/20250612/dc4933e3/attachment-0001.htm>