ubuntu-x-swat team mailing list archive

[JohnWashington <ubuntu@xxxxxxxxxxxxxx>]

** Description changed:

  Binary package hint: xserver-xorg-video-mga
  
  Corrupt screen, HP Brio, Matrox G100 (display: NEC LCD1860NX and others)
  
  HP Brio, Celeron 300MHz with 256Mb ram
- On board Matrox G100 8Mb
+ On board Matrox G100 2Mb
  NEC LCD1860NX flat screen (native resolution 1280x1024)
+ 
+ [update] When I filed this originally I reported 8Mb video (possibly as a result of
+ reading HP Brio reviews), but I now believe it to be 2Mb.
  
  I have also tried a CRT display and had identical symptoms,
  so I doubt this problem is specific for this screen.
  
  The attached photo shows the display on first booting after
  installing Ubuntu 9.04.  It looks similar to a TV that's
  lost the horizontal hold, and is also displaced a little to
  the right and down.  Although some features can be made out,
  the content is shown as if 3 copies are overlaid in vertical
  stripes.
  
  The next attached photo shows this more clearly, taken after
  logging in blind.  Note how, in the top panel, the time is
  visible in 3 places.
  
  I found that Puppy and Mepix do not exhibit this problem.
  The next experiment was to take the xorg.conf generated by
  the Puppy wizard and reduce it to the following, replacing
  the empty /etc/X11/xorg.conf with:
  
  ---- start ----
  Section "ServerFlags"
      Option "RandR" "on"
  EndSection
  
  
  Section "ServerLayout"
  	Identifier     "X.org Configured"
  	Screen      0  "Screen0" 0 0
  	InputDevice    "Mouse0" "CorePointer"
  	InputDevice    "Keyboard0" "CoreKeyboard"
  EndSection
  
  Section "InputDevice"
  	Identifier  "Keyboard0"
  	Driver      "kbd"
  	Option      "XkbRules" "xorg"
  	Option      "XkbModel" "pc102"
  	Option      "XkbLayout" "us" #xkeymap0
  EndSection
  
  Section "InputDevice"
  	Identifier  "Mouse0"
  	Driver      "mouse"
  	Option	    "Protocol" "auto" #mouse0protocol
  	Option	    "Device" "/dev/mouse"
  	#Option      "Emulate3Buttons"
  	#Option      "Emulate3Timeout" "50"
  	Option      "ZAxisMapping" "4 5" #scrollwheel
  EndSection
  
  Section "Monitor"
  	Identifier   "Monitor0"
  	VendorName   "Monitor Vendor"
  	ModelName    "Monitor Model"
  	HorizSync    30-72
  	VertRefresh  50-85
  	#UseModes     "Modes0" #monitor0usemodes
  	Option      "PreferredMode" "1024x768"
  	EndSection
  	
  Section "Modes"
  	Identifier "Modes0"
  	#modes0modeline0
  EndSection
  
  Section "Device"
  	### Available Driver options are:-
  	### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
  	### <string>: "String", <freq>: "<f> Hz/kHz/MHz"
  	### [arg]: arg optional
  	#Option     "ShadowFB"           	# [<bool>]
  	#Option     "DefaultRefresh"     	# [<bool>]
  	#Option     "ModeSetClearScreen" 	# [<bool>]
  	Identifier  "Card0"
  	Driver      "vesa" #card0driver
  	VendorName  "Matrox Graphics, Inc."
  	BoardName   "MGA G100 [Productiva] AGP"
  	BusID       "PCI:1:0:0"
  EndSection
  
  Section "Screen"
  	Identifier "Screen0"
  	Device     "Card0"
  	Monitor    "Monitor0"
      DefaultDepth 16
      Subsection "Display"
          Depth       16
          Modes       "1024x768"
      EndSubsection
  EndSection
  ---- end of xorg.conf ----
  
  This still did not fix the display.  Neither did changing
  /etc/gdm/gdm.conf GdmXserverTimeout=10 to 25 (following
  advice in bug #319363).  But making both changes gave a
  good 1024x768 display.
  
  I downloaded an iso of Karmic alpha2 and installed this.
  The symptoms were identical.  However, now the change of
  GdmXserverTimeout=10 isn't needed, though the change of
  xorg.conf still is.
  
- The G100 8Mb should be able to produce 1280x1024 resolution 
- with at least 8-bit colour.  Since this is the native resolution 
- of the NEC display, this is what I would prefer.
+ The G100 2Mb should be able to produce 1280x1024 resolution 
+ with 8-bit colour.  Since this is the native resolution of the NEC
+ display, this is what I would prefer.
  
  I'm happy to run any tests, and do complete reinstalls of any
  distro.  I also have various other displays available that I
  could try.
  
  Though due to other commitments it may take several days for
  me to respond.  
  
  I have dumps of the /etc and /var/log trees from most of these
  experiments; they're rather large, so you may prefer to ask for
  specific files.
  
  In case you're wondering, no, the Brio isn't my regular desktop.
  But it's a nice compact little box to take along to LUG meets.
  Such machines are often discarded these days, yet are adequate
  for disadvantaged people wanting very basic facilities.  This
  is likely to be their first exposure to Linux, so it's important
  that Ubuntu works for them without intervention.

-- 
Corrupt screen, HP Brio, Matrox G100 (display: NEC LCD1860NX and others)
https://bugs.launchpad.net/bugs/393129
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