[Nouveau] [Bug 91954] "link training failed": nouveau does not recover from monitor suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91954

Géza Búza <bghome at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |bghome at gmail.com

--- Comment #7 from Géza Búza <bghome at gmail.com> ---
Created attachment 121981
  --> https://bugs.freedesktop.org/attachment.cgi?id=121981&action=edit
Kernel log of detaching and re-attaching external monitor

By looking at the log, my theory is that sometimes nouveau does not store the
preferred mode correctly when probing for available modes and tries to set an
invalid mode later.

In error_connecting_monitor.log at line 344 the list of available modes can be
seen for screen attached via display port. The native mode is 1920x1080, so the
Modeline 67 should be remembered. Now if you look at the line 392, you will see
that Modeline 52 is set instead, which is not on the list of allowed modes.

Can any developer confirm this?

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