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

[Durmuş]

i hope you can see the image, i cant on fhe phone. i tried to install arch
with archinstall script and tried latest zen kernel but result is same. it
stuck [drm] VCE enabled in VM mode. i tried  to add grub:
amdgpu.dc=0 amdgpu.si_support=1 radeon.si_support=0 amdgpu.dpm=1
amdgpu.vm_fragment_size=9 amd_iommu=off but didn't work

On Thu, Jun 12, 2025, 14:29 Durmuş <dozaltay at gmail.com> wrote:

>
> 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
>>
>
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