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Date:   Sat, 9 Apr 2022 19:32:37 +0200
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Subject: Re: AMDGPU: regression on 5.17.1 #forregzbot
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TWIMC: this mail is primarily send for documentation purposes and for
regzbot, my Linux kernel regression tracking bot. These mails usually
contain '#forregzbot' in the subject, to make them easy to spot and filter.

On 09.04.22 18:28, Michele Ballabio wrote:
> On Tue, 5 Apr 2022 10:23:16 -0400
> Alex Deucher <alexdeucher@gmail.com> wrote:
> 
>> On Mon, Apr 4, 2022 at 3:39 PM Michele Ballabio
>> <ballabio.m@gmail.com> wrote:
>>>
>>> On Mon, 4 Apr 2022 13:03:41 -0400
>>> Alex Deucher <alexdeucher@gmail.com> wrote:
>>>
>>>> On Sun, Apr 3, 2022 at 10:19 AM Michele Ballabio
>>>> <ballabio.m@gmail.com> wrote:
>>>>>
>>>>> Hi,
>>>>>         I've hit a regression on 5.17.1 (haven't tested 5.17.0,
>>>>> but 5.16-stable didn't have this problem).
>>>>>
>>>>> The machine is a Ryzen 5 1600 with AMD graphics (RX 560).
>>>>>
>>>>> The regression I hit seems to trigger when the machine is left
>>>>> idle at boot (I don't boot straight to X, I boot to a tty, login
>>>>> and then start X). The machine after a while blanks the screen.
>>>>> Usually, the screen unblanks as the keyboard is hit or the mouse
>>>>> moves, but with kernel 5.17.1 the screen does not wake up. The
>>>>> machine seems to run mostly fine: I can login from ssh, but I
>>>>> cannot reboot or halt it: a sysrq sequence is needed for that.
>>>>> Note that if the screen goes blank under X, it wakes up fine.
>>>>>
>>>>> Below a dmesg and two traces from syslog (they're quite
>>>>> similar).
>>>>
>>>> Can you bisect?  Does setting amdgpu.runpm=0 help?
>>>
>>> I can try to bisect, should I narrow the search to drivers/gpu/drm/
>>> ?
>>
>> I would just do a full bisect if possible in case the change happens
>> to be outside of drm.
>>
>>>
>>> Setting amdgpu.runpm=0 works, the display now unblanks without
>>> problems.
>>
> 
> Hi,
>     I bisected this, and the first bad commit is
> [087451f372bf76d971184caa258807b7c35aac8f] drm/amdgpu: use generic fb
> helpers instead of setting up AMD own's.

#regzbot introduced: 087451f372bf76d971184caa258807b7c35aac8f