[Bug 70254] [snb dp hotplug] Screen Blanking Issue

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70254

--- Comment #4 from Robert N <crshman at gmail.com> ---
Hello Jani,

So I've gone ahead and updated my os install to the latest ubuntu, bringing me
up to the 3.11.0-12 kernel.

It looks like the hot plug issues have gone away, which is great....however
once I turned on debugging like you mentioned I figured out what was actually
going on.

Right before my either of my monitors goes blank I get a message emitted like
this:

Oct 12 11:22:02 rnavarro-thinkpad kernel: [  673.201706]
[drm:ironlake_irq_handler], Pipe B FIFO underrun
Oct 12 11:22:02 rnavarro-thinkpad kernel: [  673.201719]
[drm:cpt_serr_int_handler], PCH transcoder B FIFO underrun

Shortly after my second monitor goes blank, emitting a similar message:
Oct 12 11:22:31 rnavarro-thinkpad kernel: [  702.411812]
[drm:ironlake_irq_handler], Pipe A FIFO underrun

Is there more detailed debug information that I can output to help identify
what is causing this?

I'm driving both monitors with:
Oct 12 11:22:56 rnavarro-thinkpad kernel: [  727.212145]
[drm:drm_mode_debug_printmodeline], Modeline 32:"2560x1440" 60 241500 2560 2608
2640 2720 1440 1443 1448 1481 0x48 0x9

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