i have the same problem at Gigabyte GA-MA78GM-S2H & AMD Athlon(tm) 64 X2 Dual 
Core Processor 4000+
my computer would pause for 1-2 minutes randomly 2-3 times in a day. Nothing 
changes in logs after it.
dmesg shows next:
[   15.159106] sysctl net.netfilter.nf_conntrack_acct=1 to enable it.
[   15.165222] VBoxNetFlt: dbg - g_abExecMemory=ffffffffa06e87e0
[   15.174578] VBoxNetAdp: dbg - g_abExecMemory=ffffffffa070af80
[   16.064849] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   16.064852] Bluetooth: BNEP filters: protocol multicast
[   16.914755] ppdev: user-space parallel port driver
[   17.836410] [fglrx] GART Table is not in FRAME_BUFFER range 
[   17.838679] fglrx_pci 0000:01:05.0: irq 2300 for MSI/MSI-X
[   17.852712] [fglrx] Firegl kernel thread PID: 3486
[   17.863453] APIC error on CPU1: 00(08)
[   17.863459] APIC error on CPU0: 00(08)
[   17.865974] [fglrx] Gart USWC size:803 M.
[   17.865978] [fglrx] Gart cacheable size:60 M.
[   17.865983] [fglrx] Reserved FB block: Shared offset:0, size:1000000 
[   17.865986] [fglrx] Reserved FB block: Unshared offset:fffc000, size:4000 
[   19.782632] JBD: barrier-based sync failed on dm-4:8 - disabling barriers
[   22.880019] eth0: no IPv6 routers present
[   25.860021] virbr0: no IPv6 routers present
[   79.000034] Clocksource tsc unstable (delta = -261862324 ns)
[  110.920595] JBD: barrier-based sync failed on dm-3:8 - disabling barriers

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fglrx causing APIC errors on AMD 780G
https://bugs.launchpad.net/bugs/357457
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