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vliaskov

drm: 2 cards, 1 monitor on each. One monitor does not work.

vliaskov
Mar 7th, 2018
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  1. 4.15.7-1
  2.  
  3. 2 nouveau cards
  4. /dev/dri/card0 -> DP-1 -> Monitor 1
  5. /dev/dri/card1 -> DVI-D-1 -> Monitor 2
  6.  
  7. Monitor 2 DVI-D-1 (connected do /dev/dri/card1 0b:00) always appears disconnected in xrandr. Although its drm connector reaches "connected" state.
  8.  
  9. Also: turning off the monitor does not show any drm events.
  10. When the monitor is turned back on, I see:
  11.  
  12. Mar 07 11:48:59 linux-nq5u kernel: nouveau 0000:0b:00.0: DRM: unplugged DVI-D-1
  13. Mar 07 11:48:59 linux-nq5u kernel: [drm:drm_helper_hpd_irq_event [drm_kms_helper]] [CONNECTOR:50:DVI-D-1] status updated from connected to connected
  14. Mar 07 11:48:59 linux-nq5u kernel: nouveau 0000:0b:00.0: DRM: plugged DVI-D-1
  15. Mar 07 11:48:59 linux-nq5u kernel: [drm:drm_helper_hpd_irq_event [drm_kms_helper]] [CONNECTOR:50:DVI-D-1] status updated from connected to connected
  16.  
  17. Is this monitor state stuck in a "connected" state that does not really work?
  18.  
  19.  
  20. The other monitor (DP-1, connected to /dev/dri/card0 03:00) works ok.
  21.  
  22. Turning off the monitor shows drm events:
  23.  
  24. Mar 07 12:05:45 linux-nq5u kernel: nouveau 0000:03:00.0: DRM: unplugged DP-1
  25. Mar 07 12:05:45 linux-nq5u kernel: [drm:drm_helper_hpd_irq_event [drm_kms_helper]] [CONNECTOR:53:DP-1] status updated from connected to disconnected
  26. Mar 07 12:05:45 linux-nq5u kernel: [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:53:DP-1]
  27. Mar 07 12:05:45 linux-nq5u kernel: [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:53:DP-1] disconnected
  28. Mar 07 12:05:45 linux-nq5u kernel: [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:53:DP-1]
  29. Mar 07 12:05:46 linux-nq5u kernel: [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:53:DP-1] disconnected
  30.  
  31. And turning it back shows the expected messages as well:
  32.  
  33. Mar 07 12:06:05 linux-nq5u kernel: nouveau 0000:03:00.0: DRM: plugged DP-1
  34. Mar 07 12:06:05 linux-nq5u kernel: [drm:drm_helper_hpd_irq_event [drm_kms_helper]] [CONNECTOR:53:DP-1] status updated from disconnected to connected
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