[Bug 283723] Re: [i965] GDM screen doesn't show up on laptop used with an external display

[Bryce Harrington]

** Description changed:

  Binary package hint: xserver-xorg-video-intel
  
  Here is my setup :
  My laptop is an Acer TravelMate 6292 with an integrated graphics chipset INTEL 965GM.
  It is docked in an ACER docking station.
  An external LCD monitor is plugged on the docking station (using the VGA connector).
  The laptop's lid is generally closed.
  
  Sometimes (1 out of 4) gdm screen doesn't show up on my external monitor.
  Gdm shows up only on the laptop panel (which is generally closed...).
  If I restart the X server (CRTL-ALT-BACKSPACE), gdm shows up on both screen (external and  laptop panel even it is closed).
  Xorg-Bad.0.log is the xserver log when GDM doesn't show up on both screen
  Xorg-Good.0  is the xserver log after restarting it and when gdm shows up on both screen
  
  In Xorg-Bad.0.log, the following possibly relevant lines show up:
  (WW) intel(0): Register 0x70024 (PIPEASTAT) changed from 0x80000207 to 0x00000000
  (WW) intel(0): PIPEASTAT before: status: FIFO_UNDERRUN VSYNC_INT_STATUS SVBLANK_INT_STATUS VBLANK_INT_STATUS OREG_UPDATE_STATUS
  (WW) intel(0): PIPEASTAT after: status:
  (WW) intel(0): Register 0x71024 (PIPEBSTAT) changed from 0x00000206 to 0x00000000
  (WW) intel(0): PIPEBSTAT before: status: VSYNC_INT_STATUS SVBLANK_INT_STATUS VBLANK_INT_STATUS
  (WW) intel(0): PIPEBSTAT after: status:
  ...
  drmOpenDevice: node name is /dev/dri/card0
  drmOpenDevice: open result is -1, (No such device or address)
  drmOpenDevice: open result is -1, (No such device or address)
  drmOpenDevice: Open failed
  (twice)
  ...
  (II) [drm] loaded kernel module for "i915" driver.
  ...
  (EE) intel(0): underrun on pipe A!
  (EE) intel(0): underrun on pipe A!
  (repeating in apparent loop)
  
  In the drmOpenDevice stuff in Xorg-Good.0.log succeeds:
  drmOpenDevice: node name is /dev/dri/card0
  drmOpenDevice: open result is 10, (OK)
  
  In both cases there is also a single error line for Pipe B:
  (EE) intel(0): underrun on pipe B!
+ 
+ 
+ [lspci]
+ 00:00.0 Host bridge [0600]: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub [8086:2a00] (rev 03)
+     	Subsystem: Acer Incorporated [ALI] Device [1025:011b]
+ 00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller [8086:2a02] (rev 03)
+     	Subsystem: Acer Incorporated [ALI] Device [1025:011b]

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[i965] GDM screen doesn't show up on laptop used with an external display 
https://bugs.launchpad.net/bugs/283723
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