From: Johan Hovold <johan@kernel.org>
To: Rob Clark <robdclark@gmail.com>,
Abhinav Kumar <quic_abhinavk@quicinc.com>,
Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
Kuogee Hsieh <quic_khsieh@quicinc.com>
Cc: Sean Paul <sean@poorly.run>,
Marijn Suijten <marijn.suijten@somainline.org>,
David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
Bjorn Andersson <quic_bjorande@quicinc.com>,
quic_jesszhan@quicinc.com, quic_sbillaka@quicinc.com,
dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org,
linux-arm-msm@vger.kernel.org, regressions@lists.linux.dev,
linux-kernel@vger.kernel.org
Subject: Re: drm/msm: DisplayPort regressions in 6.8-rc1
Date: Sat, 17 Feb 2024 16:22:09 +0100 [thread overview]
Message-ID: <ZdDPISS5ntrWSPf_@hovoldconsulting.com> (raw)
In-Reply-To: <ZctVmLK4zTwcpW3A@hovoldconsulting.com>
On Tue, Feb 13, 2024 at 12:42:17PM +0100, Johan Hovold wrote:
> Since 6.8-rc1 the internal eDP display on the Lenovo ThinkPad X13s does
> not always show up on boot.
>
> The logs indicate problems with the runtime PM and eDP rework that went
> into 6.8-rc1:
>
> [ 6.007872] [drm:drm_bridge_attach [drm]] *ERROR* failed to attach bridge /soc@0/phy@88eb000 to encoder TMDS-31: -16
> and this can also manifest itself as a NULL-pointer dereference:
>
> [ 7.339447] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
>
> [ 7.643705] pc : drm_bridge_attach+0x70/0x1a8 [drm]
#regzbot ^introduced: 2bcca96abfbf
It looks like it may have been possible to hit this also before commit
2bcca96abfbf ("soc: qcom: pmic-glink: switch to DRM_AUX_HPD_BRIDGE") and
the transparent bridge rework in 6.8-rc1 even if that has not yet been
confirmed.
The above is what made this trigger since 6.8-rc1 however.
Johan
prev parent reply other threads:[~2024-02-17 15:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-13 11:42 drm/msm: DisplayPort regressions in 6.8-rc1 Johan Hovold
2024-02-13 18:00 ` Abhinav Kumar
2024-02-14 13:18 ` Linux regression tracking (Thorsten Leemhuis)
2024-02-14 13:52 ` Johan Hovold
2024-02-17 15:14 ` Johan Hovold
2024-02-19 10:41 ` drm/msm: Second DisplayPort regression " Johan Hovold
2024-02-19 13:38 ` Johan Hovold
2024-02-20 21:19 ` Abhinav Kumar
2024-02-21 8:05 ` Johan Hovold
2024-02-17 15:22 ` Johan Hovold [this message]
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