[Bug 62056] Displayport output suddenly blank; "encoder's hw state doesn't match sw tracking (expected 1, found 0)"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=62056

--- Comment #2 from Jan Kundrát <jkt at flaska.net> ---
Created attachment 76271
  --> https://bugs.freedesktop.org/attachment.cgi?id=76271&action=edit
Recent part of the dmesg

I've discovered that the laptop was not able to detect the external LCD over
the DP even after a reboot, a power cycle, a kernel update and several
plug-replug cycles of the DP cable; I've also switched the cable to the
laptop's own output instead of going through the dock. The DVI output worked,
though. In the end, a power cycle of the *monitor* fixed the problem. This
might therefore involve some low-level, hardware-specific detail which might
make it hard to properly diagnose. Please feel free to close this as a one-time
glitch.

The machine has been up for a few days and I'd prefer not to add a ful log of
everything. Attached is the log starting on the preceding evening. If you'd
like to see the initial boot as well, I can provide it -- just tell me. In the
meanwhile, I've upgraded to 3.8.1 and recent xf86-video-intel git.

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