RE comment #5 
01:05.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee
ATI RS880M [Mobility Radeon HD 4200 Series] [1002:9712]
    Subsystem: Acer Incorporated [ALI] Device [1025:0360]
    Kernel driver in use: radeon

You are now using the open source radeon drivers.

Installing the proprietary amd drivers (13.1 edition) is only supported
up to kernel 3.4 and xorg 1.12 (text below copied from link):

**********************
Description:
Automated installer and Display Drivers for Xorg 6.9 to Xserver 1.12 and Kernel 
version up to 3.4
*********************
Hence not sure that reinstalling just the driver would solve your issues (since 
you are running 3.5 kernel AND Xorg 1.13)

http://support.amd.com/us/gpudownload/linux/legacy/Pages/legacy-
radeon_linux.aspx

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https://bugs.launchpad.net/bugs/1139563

Title:
  No boot time display (blank screen)  for ATI RS880M Mobility Radeon HD
  4200 Series in Ubuntu 12.10

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