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Bug#1075770: [bug report] adlp_tc_phy_connect [i915] floods logs with drm_WARN_ON(tc->mode == TC_PORT_LEGACY) call traces

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On Mon, 15 Jul 2024, Francesco Poli <invernomuto@paranoici.org> wrote:
> Hi all,
> on a laptop where I installed Debian testing some 6 months ago,
> I noticed that the logs are continuously flooded with call traces
> like the attached snippet (taken from /var/log/kern.log ).
>
> It seems to me that it also used to happen with previous versions
> of the Linux kernel, but I am under the impression that, with Linux
> kernel 6.9.7, it got worse. I have recently upgraded to Linux kernel
> version 6.9.8 (provided by the distro, Debian testing, as I said), but
> the bug is still reproducible:
>
>   $ uname -srvmo
>   Linux 6.9.8-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.9.8-1 (2024-07-07) x86_64 GNU/Linux
>
> I see at least 12 of these call traces just after boot, before even
> starting X (with 'startx').
> More of these call traces are sent to the logs after starting X, or
> after invoking 'xrandr', or after locking the X session (with
> XScreenSaver), ...
> I always see these call traces (I mean the bug is always reproducible:
> each time I boot, each time I call xrandr, ...).
>
> They seem to correspond to no actual issue, as far as I can tell,
> but they are flooding the logs with a significant flow of text...
> which is worrying by itself.
>
>
> What's wrong?
> How can I stop this log-filling flood?
> Should I black-list some module, for instance?
>
>
> The outputs of
>
>   # lspci -vnn -d :*:0300
>
> and of
>
>   # dmidecode
>
> are attached.
> Also, I booted with kernel parameters
> 'drm.debug=0xe log_buf_len=4M ignore_loglevel' and
> logged in as root right after the boot.
> The output of
>
>   # dmesg
>
> is attached.
>
> Some additional information may be found on the [Debian bug] report I had previously filed.
>
> [Debian bug]: <https://bugs.debian.org/1075770>
>
>
> N.B.:
> Please Cc me and the Debian bug address <1075770@bugs.debian.org>
> on replies, so that the interested parties (including me!) are kept
> in the loop.
> Thanks a lot for your time and for any help you may provide!

Please file i915 bugs at fdo gitlab as described at [1].

BR,
Jani.

[1] https://drm.pages.freedesktop.org/intel-docs/how-to-file-i915-bugs.html


-- 
Jani Nikula, Intel

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Bug#1075770: linux-image-6.9.7-amd64: adlp_tc_phy_connect [i915] fills logs with drm_WARN_ON(tc->mode == TC_PORT_LEGACY) call traces "Francesco Poli (wintermute)" <invernomuto@paranoici.org> - 2024-07-04 19:40 +0200
  Bug#1075770: linux-image-6.9.7-amd64: adlp_tc_phy_connect [i915] fills logs with drm_WARN_ON(tc->mode == TC_PORT_LEGACY) call traces Salvatore Bonaccorso <carnil@debian.org> - 2024-07-13 15:10 +0200
    Bug#1075770: linux-image-6.9.7-amd64: adlp_tc_phy_connect [i915] fills logs with drm_WARN_ON(tc->mode == TC_PORT_LEGACY) call traces Francesco Poli <invernomuto@paranoici.org> - 2024-07-13 19:20 +0200
      Bug#1075770: linux-image-6.9.7-amd64: adlp_tc_phy_connect [i915] fills logs with drm_WARN_ON(tc->mode == TC_PORT_LEGACY) call traces Salvatore Bonaccorso <carnil@debian.org> - 2024-07-13 21:00 +0200
        Bug#1075770: linux-image-6.9.7-amd64: adlp_tc_phy_connect [i915] fills logs with drm_WARN_ON(tc->mode == TC_PORT_LEGACY) call traces Francesco Poli <invernomuto@paranoici.org> - 2024-07-15 20:30 +0200
  Bug#1075770: [bug report] adlp_tc_phy_connect [i915] floods logs with drm_WARN_ON(tc->mode == TC_PORT_LEGACY) call traces Jani Nikula <jani.nikula@linux.intel.com> - 2024-07-24 18:20 +0200
  Bug#1075770: [bug report] adlp_tc_phy_connect [i915] floods logs with drm_WARN_ON(tc->mode == TC_PORT_LEGACY) call traces Imre Deak <imre.deak@intel.com> - 2024-07-24 20:40 +0200
    Bug#1075770: [bug report] adlp_tc_phy_connect [i915] floods logs with drm_WARN_ON(tc->mode == TC_PORT_LEGACY) call traces Francesco Poli <invernomuto@paranoici.org> - 2024-07-26 00:10 +0200
      Bug#1075770: [bug report] adlp_tc_phy_connect [i915] floods logs with drm_WARN_ON(tc->mode == TC_PORT_LEGACY) call traces Jani Nikula <jani.nikula@intel.com> - 2024-07-29 12:40 +0200
        Bug#1075770: [bug report] adlp_tc_phy_connect [i915] floods logs with drm_WARN_ON(tc->mode == TC_PORT_LEGACY) call traces Francesco Poli <invernomuto@paranoici.org> - 2024-10-29 09:00 +0100
  Processed: Re: [bug report] adlp_tc_phy_connect [i915] floods  logs with drm_WARN_ON(tc->mode == TC_PORT_LEGACY) call traces "Debian Bug Tracking System" <owner@bugs.debian.org> - 2024-10-29 09:00 +0100
  Bug#1075770: [bug report] adlp_tc_phy_connect [i915] floods logs with drm_WARN_ON(tc->mode == TC_PORT_LEGACY) call traces Angelo Pantano <ghilteras@gmail.com> - 2024-12-05 20:40 +0100

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