Do the artifacts go away if you remove vga=795 from the kernel command
line?

** Description changed:

  Binary package hint: plymouth
  
  The screen at boot up starts off as blank (black) after grub and
  switches to an aubergine (magenta?) with no animation. Artifacts are
  seen at the top  of the screen for about (20 pixels or so). [I don't
  have a camera, hence unable to attach a photograph]. Then the screen
  refreshes to the login screen (gdm) -- here the display is fine.
  
  ProblemType: Bug
  Architecture: i386
  Date: Fri Mar 19 10:58:48 2010
  DistroRelease: Ubuntu 10.04
  MachineType: Sony Corporation VPCEB16FG
  Package: plymouth 0.8.0~-17
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-16-generic-pae 
root=/dev/mapper/linux-ubuntu ro splash vga=795 quiet splash
  ProcEnviron:
-  LANG=en_US.utf8
-  SHELL=/bin/bash
+  LANG=en_US.utf8
+  SHELL=/bin/bash
  ProcFB: 0 VGA16 VGA
  ProcVersionSignature: Ubuntu 2.6.32-16.25-generic-pae
  SourcePackage: plymouth
  Uname: Linux 2.6.32-16-generic-pae i686
  dmi.bios.date: 01/26/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: R0230Y8
  dmi.board.asset.tag: N/A
  dmi.board.name: VAIO
  dmi.board.vendor: Sony Corporation
  dmi.board.version: N/A
  dmi.chassis.asset.tag: N/A
  dmi.chassis.type: 10
  dmi.chassis.vendor: Sony Corporation
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrR0230Y8:bd01/26/2010:svnSonyCorporation:pnVPCEB16FG:pvrC60415RM:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
  dmi.product.name: VPCEB16FG
  dmi.product.version: C60415RM
  dmi.sys.vendor: Sony Corporation
- --- 
+ ---
  Architecture: i386
  DistroRelease: Ubuntu 10.04
  MachineType: Sony Corporation VPCEB16FG
  Package: plymouth 0.8.1-1ubuntu1
  PackageArchitecture: i386
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-17-generic-pae 
root=/dev/mapper/linux-ubuntu ro splash vga=789 quiet splash
  ProcEnviron:
-  PATH=(custom, no user)
-  LANG=en_US.utf8
-  SHELL=/bin/bash
+  PATH=(custom, no user)
+  LANG=en_US.utf8
+  SHELL=/bin/bash
  ProcFB: 0 VGA16 VGA
  ProcVersionSignature: Ubuntu 2.6.32-17.26-generic-pae 2.6.32.10+drm33.1
  Tags: lucid
  Uname: Linux 2.6.32-17-generic-pae i686
  UserGroups:
-  
+ 
  dmi.bios.date: 01/26/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: R0230Y8
  dmi.board.asset.tag: N/A
  dmi.board.name: VAIO
  dmi.board.vendor: Sony Corporation
  dmi.board.version: N/A
  dmi.chassis.asset.tag: N/A
  dmi.chassis.type: 10
  dmi.chassis.vendor: Sony Corporation
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrR0230Y8:bd01/26/2010:svnSonyCorporation:pnVPCEB16FG:pvrC60415RM:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
  dmi.product.name: VPCEB16FG
  dmi.product.version: C60415RM
  dmi.sys.vendor: Sony Corporation
+ 
+ [lspci]
+ 01:00.0 VGA compatible controller [0300]: ATI Technologies Inc Redwood 
[Radeon HD 5600 Series] [1002:68c1]
+       Subsystem: Sony Corporation Device [104d:9071]

-- 
plymouth: blank/unanimated screen at boot (cat /proc/fb:  0 VGA16 VGA)
https://bugs.launchpad.net/bugs/541700
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