linux-kernel - Re: nouveau "eDP-1: EDID is invalid" regression after 4.11 with HP ZBook 15 G3

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Message-ID: <CA+ydwtouo8f_NHPvd8tjwU9VoH-cwpdNdW8NhYp5AhGy7HD4dQ@mail.gmail.com>
Date:   Mon, 15 May 2017 08:20:50 +0300
From:   Tommi Rantala <tt.rantala@...il.com>
To:     Ben Skeggs <bskeggs@...hat.com>
Cc:     David Airlie <airlied@...ux.ie>,
        LKML <linux-kernel@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        nouveau@...ts.freedesktop.org
Subject: Re: nouveau "eDP-1: EDID is invalid" regression after 4.11 with HP
 ZBook 15 G3

2017-05-15 3:03 GMT+03:00 Ben Skeggs <bskeggs@...hat.com>:
> On 05/15/2017 01:10 AM, Tommi Rantala wrote:
>>
>> Hi,
>
> Hey Tommi,
>
> Thanks for bisecting this.  It's rather unexpected that you should be seeing
> problems here, but, the commit makes sense for it at least.
>
> Are you able to get me new kernel logs of both before and after this patch
> with "log_buf_len=8M drm.debug=0x14
> nouveau.debug=disp=trace,i2c=trace,bios=trace" please?

Hi Ben,

Before:
https://www.dropbox.com/s/b2namqtqvzv5ppp/trace.4.10.0-tr-10409-g5c68d91?dl=1

After:
https://www.dropbox.com/s/9url8qdo15959fy/trace.4.10.0-tr-10410-gdf8dc97?dl=1

-Tommi

> Thanks,
> Ben.
>
>
>>
>> Bisected this to:
>>
>> commit df8dc97cd17269474344d73cc02739532c468d04
>> Author: Ben Skeggs <bskeggs@...hat.com>
>> Date:   Wed Mar 1 09:42:04 2017 +1000
>>
>>     drm/nouveau/kms/nv50: use drm core i2c-over-aux algorithm
>>
>>     I'm not entirely sure NVKM needs to support this now, but I haven't
>>     removed it as of yet just in case it's needed from DEVINIT scripts
>>     where DRM isn't available.
>>
>>     Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
>>
>>
>> dmesg after boot with drm.debug enabled:
>>
>> v4.10-10409-g5c68d91 (still works):
>> http://termbin.com/b0is
>>
>> v4.10-10410-gdf8dc97 (failure):
>> http://termbin.com/j6lq
>>
>>
>> Tommi
>>
>>
>> 2017-05-10 11:24 GMT+03:00 Tommi Rantala <tt.rantala@...il.com>:
>>>
>>> Hi,
>>>
>>> The HP ZBook 15 G3 laptop builtin display (eDP-1) does not work
>>> correctly with v4.11-11413-g2868b25.
>>>
>>> When booting the laptop, the resolution seems to be limited to
>>> 1024x768, and gnome-session segfaults.
>>>
>>> Up to 4.11 the display works just fine in 1920x1080 mode.
>>>
>>> I'm seeing this in the kernel logs:
>>>
>>> nouveau 0000:01:00.0: eDP-1: EDID is invalid:
>>>          [00] BAD  00 ff ff ff ff ff ff 00 ff ff ff ff ff ff ff ff
>>>          [00] BAD  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>>>          [00] BAD  ff ff ff ff ff ff ff ff ff ff ff ff ff 84 53 54
>>>          [00] BAD  66 69 50 55 57 66 74 49 48 ff ff ff ff ff ff ff
>>>          [00] BAD  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>>>          [00] BAD  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>>>          [00] BAD  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>>>          [00] BAD  ff ff ff ff ff ff ff ff ff ff ff 00 00 ff 00 ff
>>> nouveau 0000:01:00.0: DRM: DDC responded, but no EDID for eDP-1
>>> [drm] Cannot find any crtc or sizes - going 1024x768
>>>
>>>
>>> $ lspci | grep NVIDIA
>>> 01:00.0 VGA compatible controller: NVIDIA Corporation GM107GLM [Quadro
>>> M2000M] (rev a2)
>>>
>>> Any ideas, or should I bisect?
>>>
>>> 4.11 dmesg & xrandr output:
>>> https://pastebin.com/raw/P9LGP7e1
>>>
>>> 4.11-11413-g2868b25 dmesg:
>>> https://pastebin.com/raw/QBT9mMua
>>>
>>> -Tommi