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  1. Bug #929635
  2. Comment #3

Comment 3 for bug 929635

Revision history for this message
Mark Russell (marrusl) wrote : Re: [snb-m-gt2] Blank screen after login with dual monitor

Hi Bryce,
Just got back home to my external display. Here are my results so far using the kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-fixes/current/ (uname -r = 3.3.0-994-generic).

Steps: boot all the way to Unity desktop, plug in external display, observe.

Try 1: both screens go black, syslog reports:
Feb 26 08:20:14 ix kernel: [ 116.759740] [drm:pch_irq_handler] *ERROR* PCH poison interrupt
Feb 26 08:20:17 ix kernel: [ 119.188654] [drm:intel_cpt_verify_modeset] *ERROR* mode set failed: pipe 0 stuck

Try 2 and 3: same.

Try 4: external display turns on, laptop display turns off. Syslog only has the first of the two messages (PCH poison interrupt). When I go to System Settings > Displays and try to enable the laptop panel, the dialog box returns:
"The selected configuration for displays could not be applied
could not set the configuration for CRTC 63"
Additional syslog line after attempt to start laptop panel:
Feb 26 08:38:40 ix kernel: [ 398.581027] [drm:drm_crtc_helper_set_config] *ERROR* failed to set mode on [CRTC:3]

So far that's been the experience: most boots (more than 75%) go like Try 1, but sometimes, I get the results of Try 4.