[Bug 215511] New: Dual monitor with amd 5700 causes system to hang at startup.

[Bug 215511] New: Dual monitor with amd 5700 causes system to hang at startup.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215511

            Bug ID: 215511
           Summary: Dual monitor with amd 5700 causes system to hang at
                    startup.
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.16.1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: pmestre@gmail.com
        Regression: No

Created attachment 300294
  --> https://bugzilla.kernel.org/attachment.cgi?id=300294&action=edit
dual monitor boot crash with amdgpu card.

Hello, system mostly crashes (sometimes in different ways) when i start with
more than one monitor attached.

If i switch off one monitor then system boots correctly (i don't need to detach
the displayport cable, just to switch off the monitor).


When both monitors are connected, most of the times it just crashes as the
attached log, sometimes it boots but screen is flickering and with artifacts.

This happened with kernel 5.10 and 5.11, it was fixed i don't remember exactly
when, and is happening again. For me it worked with kernel 5.15.8 and failed
with 5.15.13.
It is still failing with 5.16.1.

Kind regards and many thanks for your work in the most crucial open-source
project.

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[Bug 215511] Dual monitor with amd 5700 causes system to hang at startup.

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Alex Deucher (alexdeucher@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com

--- Comment #1 from Alex Deucher (alexdeucher@gmail.com) ---
Can you bisect to see what broke it and/or what fixed it originally?

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[Bug 215511] Dual monitor with amd 5700 causes system to hang at startup.

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https://bugzilla.kernel.org/show_bug.cgi?id=215511

--- Comment #2 from Jose Mestre (pmestre@gmail.com) ---
Hello. I've been unable to compile a specific kernel commit (i did not have too
much time to find the docs about how to do it) and i don't know C.

I've tried releases for archlinux and i can confirm that linux 5.15.12 worked
ok, and 5.15.13 was the first release that make kernel crash with the two
monitors switched on.

If you can point me how to do it i can bisect, compile and try the kernels.

Kind regards.

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[Bug 215511] Dual monitor with amd 5700 causes system to hang at startup.

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--- Comment #3 from Alex Deucher (alexdeucher@gmail.com) ---
Here's a howto for doing a bisect:
https://www.kernel.org/doc/html/latest/admin-guide/bug-bisect.html
Here's a howto for building a kernel:
https://kernelnewbies.org/KernelBuild

Basic process:
# create a directly to store your git source
mkdir kernel
# change to that directory
cd kernel
# clone the stable git tree
git clone git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
# copy your distros config to use for your build, replace #whatever with
# whatever config your distro is using
cp /boot/config-#whatever .config
# start bisecting
git bisect start
# tag 5.15.13 as bad
git bisect bad v5.15.13
# tag 5.15.2 as good
git bisect good v5.15.12
# build the first kernel to test
make clean
make
make modules_install
make install
# test the new kernel
# if it's good, mark it as good
git bisect good
# if it's bad, mark it as bad
git bisect bad
# build the next kernel to test
make
make modules_install
make install
# test the new kernel
# repeat until the bisect is complete

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[Bug 215511] Dual monitor with amd 5700 causes system to hang at startup.

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--- Comment #4 from Jose Mestre (pmestre@gmail.com) ---
0f591d17e36e08313b0c440b99b0e57b47e01a9a is the first bad commit
commit 0f591d17e36e08313b0c440b99b0e57b47e01a9a
Author: Angus Wang <angus.wang@amd.com>
Date:   Thu Dec 9 17:27:01 2021 -0500

    drm/amd/display: Changed pipe split policy to allow for multi-display pipe
split

    commit ee2698cf79cc759a397c61086c758d4cc85938bf upstream.

    [WHY]
    Current implementation of pipe split policy prevents pipe split with
    multiple displays connected, which caused the MCLK speed to be stuck at
    max

    [HOW]
    Changed the pipe split policies so that pipe split is allowed for
    multi-display configurations

    Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1522
    Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1709
    Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1655
    Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1403

    Note this is a backport of this commit from amdgpu drm-next for 5.16.

    Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
    Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
    Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
    Signed-off-by: Angus Wang <angus.wang@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Cc: stable@vger.kernel.org
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

 drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c   | 2 +-
 drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c   | 2 +-
 drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c   | 2 +-
 drivers/gpu/drm/amd/display/dc/dcn301/dcn301_resource.c | 2 +-
 drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c | 2 +-
 drivers/gpu/drm/amd/display/dc/dcn303/dcn303_resource.c | 2 +-
 drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c   | 2 +-
 7 files changed, 7 insertions(+), 7 deletions(-)

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[Bug 215511] Dual monitor with amd 5700 causes system to hang at startup.

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--- Comment #5 from Alex Deucher (alexdeucher@gmail.com) ---
Created attachment 300385
  --> https://bugzilla.kernel.org/attachment.cgi?id=300385&action=edit
possible fix

This patch should fix it.

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[Bug 215511] Dual monitor with amd 5700 causes system to hang at startup.

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--- Comment #6 from Jose Mestre (pmestre@gmail.com) ---
Hello, i've tried this patch and it works with
5.15.12#0f591d17e36e08313b0c440b99b0e57b47e01a9a and with 5.17.0-rc2.
Kind regards.

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[Bug 215511] Dual monitor with amd 5700 causes system to hang at startup.

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Philipp Riederer (pr_kernel@tum.fail) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pr_kernel@tum.fail

--- Comment #7 from Philipp Riederer (pr_kernel@tum.fail) ---
Hi!

My Lenovo T14s (AMD) crashes with a panic (https://imgur.com/a/P6Twvov) when I
unplug/replug any monitor. This also happens when waking from DPMS.

I have bisected the issue to the same 0f591d17e36e08313b0c440b99b0e57b47e01a9a
as Jose. The patch (that is already mainlined, if I see that correctly) does
not help.

I have tried all kernel up to 5.15.24 -- I cannot try 5.16 as I use zfs as root
device the and zfs module is not (yet) compatible with 5.16.

Is there anything you would like me to try or should my issue be fixed in
5.16+?

Cheers,
Philipp

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[Bug 215511] Dual monitor with amd 5700 causes system to hang at startup.

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--- Comment #8 from Alex Deucher (alexdeucher@gmail.com) ---
(In reply to Philipp Riederer from comment #7)
> Hi!
> 
> My Lenovo T14s (AMD) crashes with a panic (https://imgur.com/a/P6Twvov) when
> I unplug/replug any monitor. This also happens when waking from DPMS.
> 
> I have bisected the issue to the same
> 0f591d17e36e08313b0c440b99b0e57b47e01a9a as Jose. The patch (that is already
> mainlined, if I see that correctly) does not help.
> 
> I have tried all kernel up to 5.15.24 -- I cannot try 5.16 as I use zfs as
> root device the and zfs module is not (yet) compatible with 5.16.
> 
> Is there anything you would like me to try or should my issue be fixed in
> 5.16+?

Please open a new ticket as this is a different issue.

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--- Comment #9 from Philipp Riederer (pr_kernel@tum.fail) ---
Certainly. Thank you!

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--- Comment #10 from Alex Deucher (alexdeucher@gmail.com) ---
Created attachment 303812
  --> https://bugzilla.kernel.org/attachment.cgi?id=303812&action=edit
possible fix 1/2

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--- Comment #11 from Alex Deucher (alexdeucher@gmail.com) ---
Created attachment 303813
  --> https://bugzilla.kernel.org/attachment.cgi?id=303813&action=edit
possible fix 2/2

Do the two attached patches fix the issue?

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