Approximately a month ago, the system would sometimes hang completely during boot, generally after printing lines like (I write them from memory):
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# Starting Bridge Socket Management
# Starting Network Manager
Now after the last kernel update (version 3.5.0-27, if I recall correctly), booting would sometimes end with a blank screen, but it did not hang completely, as I could reset the machine with Ctrl+Alt+Delete.
Attempting to boot with nomodeset, the system would give the following line during boot (again, I am writing this mostly from memory):
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... timeout. Kill /sbin/modprobe -bv pci:v00001002d00006740sv0000103Csd00001657bc03sc00i00
Running lspci -nn I manage to see that the second problem appears to be related to the video card:
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01:00.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI Whistler XT [AMD Radeon HD 6700M Series] [1002:6740]
My hardware specifications are:
HP Notebook dv6-6047cl
Video Card: Radeon HD 6770M switchable graphics
Processor: Intel Core i7-2630QM
Memory: 8GB DDR3
1 TB Harddrive