<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - [snb dp hotplug] Screen Blanking Issue" href="https://bugs.freedesktop.org/show_bug.cgi?id=70254#c4">Comment # 4</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - [snb dp hotplug] Screen Blanking Issue" href="https://bugs.freedesktop.org/show_bug.cgi?id=70254">bug 70254</a> from <a class="email" href="mailto:crshman@gmail.com" title="Robert N <crshman@gmail.com>"> Robert N</a> <pre>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</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>