https://bugs.freedesktop.org/show_bug.cgi?id=90681
Bug ID: 90681
Summary: Radeon Kernel Oops & Lockup when switching on
DisplayPort attached monitor
Product: DRI
Version: unspecified
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: major
Priority: medium
Component: DRM/Radeon
Assignee: dri-devel at lists.freedesktop.org
Reporter: bradfirj at fstab.me
Created attachment 116079
--> https://bugs.freedesktop.org/attachment.cgi?id=116079&action=edit
journalctl output for crash
Switching my DisplayPort attached monitor on (or off and then on again) while
booted to multiuser target (no Xorg or Wayland) causes a kernel Oops, followed
by soft-lockups which render the system unusable.
Doing the same while at the full Graphical target causes gnome-shell to crash,
but it is possible to recover the system by logging in again.
The kernel error and IP are:
>May 24 23:25:28 fedora-workstation.home kernel: BUG: unable to handle kernel
>NULL pointer dereference at 00000000000003b0
>May 24 23:25:28 fedora-workstation.home kernel: IP: [<ffffffffa0152055>]
>radeon_connector_edid+0x5/0x70 [radeon]
Full journal from a reproduction of the bug will be attached, as will lspci
-nn.
I have isolated this using git bisect to the following commit (the patch for
which is attached to this bug).
This is a commit currently part of the linux-stable tree and lies between 4.0.2
and 4.0.3
>016a255b7835ee7e49a3eba3c14ba0bc0221a4f8 is the first bad commit
>commit 016a255b7835ee7e49a3eba3c14ba0bc0221a4f8
>Author: Alex Deucher <alexander.deucher at amd.com>
>Date: Tue Apr 7 09:52:42 2015 -0400
>
> drm/radeon: only mark audio as connected if the monitor supports it (v3)
>
> commit 0f55db36d49d45b80eff0c0a2a498766016f458b upstream.
>
> Otherwise the driver may try and send audio which may confuse the
> monitor.
>
> v2: set pin to NULL if no audio
> v3: avoid crash with analog encoders
>
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>>
>
>:040000 040000 de0366a6790f5c91d175bcb89cb34956bbe72b26
>>bbdb5734961f824558152c7c34a840c78bc3a9a9 M drivers
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