[Bug 110782] [drm/i915] Displayport connected screen reports Signal Error after update to 5.1 kernel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110782

--- Comment #17 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Blubberbub from comment #16)
> Created attachment 144499 [details]
> bad dmesg drm.debug=0xe log_buf_len=4M on drm-tip f384132bcdd867 with
> "[PATCH] mst m/n debugs"
> 
> I patched the attachment 144494 [details] [review] on top of the bad drm-tip
> f384132bcdd8670478b99a2a71753e1595305dce (resulting in
> 6c16031c189b5fcb9eaf0ee5ac6a9e72a8d0cda7) and created a dmesg log with
> "drm.debug=0xe log_buf_len=4M".
> 
> Do you also need the dmesg for a good kernel that is patched with that patch?

No, I don't think that would provide us anything we don't already know.

In this case we get:
[    6.158894] [drm:intel_dp_mst_compute_config [i915]] bpp 24, lanes 4,
dotclock 154000, port clock 540000
[    6.158951] [drm:intel_dp_mst_compute_config [i915]] gmch m 1794230, gmch n
8388608, link m 299038, link n 1048576
...
[    6.160712] [drm:intel_dump_pipe_config [i915]] dp m_n: lanes: 4; gmch_m:
1703936, gmch_n: 8388608, link_m: 283989, link_n: 1048576, tu: 14

The m numbers do not match, which should be impossible.

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