Public bug reported:

I just installed Ubuntu 13.04 through the Alternate CD. The installation 
finished without no problems nor warnings.
The problem is that the login screen (lightdm) is showing horizontal black 
lines and also shows  a huge amount of the screen colored with black and 
sometimes with lime green, the mouse pointer is not visible and when it's moved 
more lines appear on the screen.

When plymouth animation is running the screen resolution is set to
1024x768 and there's no problems, but when the login screen appears the
resolution changes to 1280x960. And is impossible to login through
lightdm. I've set the auto-login via tty and restarted, but the black
lines, the black colored part of the screen and the mouse pointer issue
remain. Also, when I'm logged in I tried to change the resolution to
1024x768 via xrandr on a terminal emulator, the resolution changes but
the problems persist.

Because of this issues the desktop is totally unusable. 2 years ago I
installed Lubuntu 11.04 on the same computer and it weren't no problems
with it.

Computer specifications:

Intel Pentium 4 1.6 GHz Processor
256 MB RAM DDR Memory
40 GB Seagate HDD
S3 ProsavageDDR Video integrated card with 32MB of shared memory
ECS M925 or ECS M925L motherboard
Fresh install of Lubuntu 13.04 (and the same problem is present on Lubuntu 
12.10)

"lspci" dump:
lspci | grep "VGA"
01:00.0 VGA compatible controller: S3 Inc. VT8375 [ProSavage8 KM266/KL266] 

Screenshots:

http://ubuntuone.com/3vzv7FbxK9KQ7fOs7Ig9G1

http://ubuntuone.com/2aNi0yyO7obv8PG5ZX4xe9

** Affects: xserver-xorg-video-savage (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: lubuntu precise quantal raring

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https://bugs.launchpad.net/bugs/1175441

Title:
  Black lines, no mouse pointer and a part of the screen in black  on
  Lubuntu 13.04 & 12.10

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