Kernel 5.15.150 black screen with AMD Raven/Picasso GPU

[Armin Wolf]

Am 23.05.24 um 18:29 schrieb Greg KH:

> On Thu, May 23, 2024 at 05:59:39PM +0200, Armin Wolf wrote:
>> Am 23.05.24 um 15:13 schrieb Barry Kauler:
>>
>>> On Wed, May 22, 2024 at 12:58 AM Armin Wolf <W_Armin at gmx.de> wrote:
>>>> Am 20.05.24 um 18:22 schrieb Alex Deucher:
>>>>
>>>>> On Sat, May 18, 2024 at 8:17 PM Armin Wolf <W_Armin at gmx.de> wrote:
>>>>>> Am 17.05.24 um 03:30 schrieb Barry Kauler:
>>>>>>
>>>>>>> Armin, Yifan, Prike,
>>>>>>> I will top-post, so you don't have to scroll down.
>>>>>>> After identifying the commit that causes black screen with my gpu, I
>>>>>>> posted the result to you guys, on May 9.
>>>>>>> It is now May 17 and no reply.
>>>>>>> OK, I have now created a patch that reverts Yifan's commit, compiled
>>>>>>> 5.15.158, and my gpu now works.
>>>>>>> Note, the radeon module is not loaded, so it is not a factor.
>>>>>>> I'm not a kernel developer. I have identified the culprit and it is up
>>>>>>> to you guys to fix it, Yifan especially, as you are the person who has
>>>>>>> created the regression.
>>>>>>> I will attach my patch.
>>>>>>> Regards,
>>>>>>> Barry Kauler
>>>>>> Hi,
>>>>>>
>>>>>> sorry for not responding to your findings. I normally do not work with GPU drivers,
>>>>>> so i hoped one of the amdgpu developers would handle this.
>>>>>>
>>>>>> I CCeddri-devel at lists.freedesktop.org  and amd-gfx at lists.freedesktop.org so that other
>>>>>> amdgpu developers hear from this issue.
>>>>>>
>>>>>> Thanks you for you persistence in finding the offending commit.
>>>>> Likely this patch should not have been ported to 5.15 in the first
>>>>> place.  The IOMMU requirements have been dropped from the driver for
>>>>> the last few kernel versions so it is no longer relevant on newer
>>>>> kernels.
>>>>>
>>>>> Alex
>>>> Barry, can you verify that the latest upstream kernel works on you device?
>>>> If yes, then the commit itself is ok and just the backporting itself was wrong.
>>>>
>>>> Thanks,
>>>> Armin Wolf
>>> Armin,
>>> The unmodified 6.8.1 kernel works ok.
>>> I presume that patch was applied long before 6.8.1 got released and
>>> only got backported to 5.15.x recently.
>>>
>>> Regards,
>>> Barry
>>>
>> Great to hear, that means we only have to revert commit 56b522f46681 ("drm/amdgpu: init iommu after amdkfd device init")
>> from the 5.15.y series.
>>
>> I CCed the stable mailing list so that they can revert the offending commit.
> Please submit the patch/revert that you wish to have applied to the tree
> so we can have the correct information in it.  I have no idea what to do
> here with this deep response thread as-is, sorry.
>
> thanks,
>
> greg k-h

Hi,

the new 5.15.161 kernel finally contains the necessary patch (many thanks to the stable team :)).

Barry, can you test this kernel version and report if the issue is now gone?

Thanks,
Armin Wolf