linux-kernel - Re: [PATCHv4] drm/amdgpu: disable ASPM on Intel Alder Lake based systems

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Date:   Mon, 2 May 2022 09:56:25 -0500
From:   "Gong, Richard" <richard.gong@....com>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     Dave Airlie <airlied@...ux.ie>, Xinhui Pan <xinhui.pan@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        dri-devel@...ts.freedesktop.org,
        Alex Deucher <alexdeucher@...il.com>,
        amd-gfx@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>,
        Alexander Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        Mario Limonciello <mario.limonciello@....com>
Subject: Re: [PATCHv4] drm/amdgpu: disable ASPM on Intel Alder Lake based
 systems

Hi Paul,

On 5/1/2022 2:08 AM, Paul Menzel wrote:
> Dear Richard,
>
>
> Sorry for the late reply.
>
> Am 26.04.22 um 15:53 schrieb Gong, Richard:
>
>> On 4/21/2022 12:35 AM, Paul Menzel wrote:
>
>>> Am 21.04.22 um 03:12 schrieb Gong, Richard:
>>>
>>>> On 4/20/2022 3:29 PM, Paul Menzel wrote:
>>>
>>>>> Am 19.04.22 um 23:46 schrieb Gong, Richard:
>>>>>
>>>>>> On 4/14/2022 2:52 AM, Paul Menzel wrote:
>>>>>>> [Cc: -kernel test robot <lkp@...el.com>]
>>>>>
>>>>> […]
>>>>>
>>>>>>> Am 13.04.22 um 15:00 schrieb Alex Deucher:
>>>>>>>> On Wed, Apr 13, 2022 at 3:43 AM Paul Menzel wrote:
>>>>>>>
>>>>>>>>> Thank you for sending out v4.
>>>>>>>>>
>>>>>>>>> Am 12.04.22 um 23:50 schrieb Richard Gong:
>
> […]
>
>>>>>>>>> I am still not clear, what “hang during suspend/resume” means. 
>>>>>>>>> I guess
>>>>>>>>> suspending works fine? During resume (S3 or S0ix?), where does 
>>>>>>>>> it hang?
>>>>>>>>> The system is functional, but there are only display problems?
>>>>>> System freeze after suspend/resume.
>>>>>
>>>>> But you see certain messages still? At what point does it freeze 
>>>>> exactly? In the bug report you posted Linux messages.
>>>>
>>>> No, the system freeze then users have to recycle power to recover.
>>>
>>> Then I misread the issue? Did you capture the messages over serial 
>>> log then?
>>
>> I think so. We captured dmesg log.

make a correction, the previous 'dmesg log' description was not accurate.

I referred that to the kernel log captured via 'journalctl' after 
recycling the power. I should use kernel log rather than 'dmesg log' to 
avoid the confusion.

>
> Then the (whole) system did *not* freeze, if you could still log in 
> (maybe over network) and execute `dmesg`. Please also paste the 
> amdgpu(?) error logs in the commit message.

As mentioned in my "previous previous" reply, the user have to recycle 
power to reset the system.

When issue occurred, keyboard/mouse didn't work.  'demsg' and ssh didn't 
work either.

>
>> As mentioned early we need support from Intel on how to get ASPM 
>> working for VI generation on Intel Alder Lake, but we don't know 
>> where things currently stand.
>
> Who is working on this, and knows?

I have no idea.


>
> Kind regards,
>
> Paul

Regards,

Richard