Unable to boot 5.18-rc kernel on amdgpu legacy (si) hardware.

[Paul Blazejowski]

-------- Original Message --------
Subject: Re: Unable to boot 5.18-rc kernel on amdgpu legacy (si) hardware.
From: Alex Deucher <alexdeucher at gmail.com>
To: Paul Blazejowski <paulb at blazebox.homeip.net>
Date: 4/15/2022, 12:15:40 PM

> On Fri, Apr 15, 2022 at 12:00 PM Paul Blazejowski
> <paulb at blazebox.homeip.net> wrote:
>>
>> Hello,
>>
>> I am unable to boot 5.18-rc1(2) kernel with my rather old (si) XFX card,
>> which works fine under 5.17.3 and previous kernels.
>>
>> The card is identified as:
>>
>> 1:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
>> Cape Verde PRO [Radeon HD 7750/8740 / R7 250E]
>>
>> Running on a Asus M5A99FX PRO R2.0 mainboard.
>>
>> The boot process stops at "fb0: EFI VGA frame buffer device" step and
>> the hdmi connected monitor just shuts off, there's not oops or any other
>> debug output captured by serial console.
>>
>> I was able to bisect the kernel tracing this to a bad commit:
>>
>> git bisect bad 3712e7a494596b26861f4dc9b81676d1d0272eaf
>> # first bad commit: [3712e7a494596b26861f4dc9b81676d1d0272eaf]
>> drm/amd/pm: unified lock protections in amdgpu_dpm.c
>>
>> And reverting this commit on 5.18-rc2 kernel makes my system bootable again.
>>
>> Please let me know if there's anything else i could provide to help fix
>> this issue. I have access to serial console if needed.
> 
> Fixed with this patch:
> https://patchwork.freedesktop.org/patch/481477/

Alex,

Great!

Just tested and indeed the patch fixed the issue!

> 
> Alex

Thank you for providing the link to a patch ...

Paul

> 
>>
>> Thank you.