hy i am having the same problem on my del inspiron 5555 -------------- my top listing shows this PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 3400 root 20 0 0 0 0 R 61,8 0,0 64:46.63 kworker/0:0 3 root 20 0 0 0 0 S 37,8 0,0 39:13.48 ksoftirqd/0 827 root 20 0 407788 120076 98268 S 2,0 3,5 2:02.02 Xorg 5014 flori 20 0 621176 32344 25432 S 1,7 1,0 0:02.00 gnome-terminal- 9 root 20 0 0 0 0 S 0,3 0,0 0:23.10 rcuos/0 1099 flori 20 0 1201488 141244 91212 S 0,3 4,2 4:04.16 compiz 1515 flori 20 0 583176 32960 27260 S 0,3 1,0 0:07.11 nm-applet ---------------my cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 0: 49 0 0 0 IO-APIC-edge timer 1: 190 52 45 636 IO-APIC-edge i8042 7: 1 0 0 0 IO-APIC-edge 8: 0 0 0 1 IO-APIC-edge rtc0 9: 0 0 0 0 IO-APIC-fasteoi acpi 16: 104 117 191 146 IO-APIC 16-fasteoi mmc0, snd_hda_intel 18: 12810 12796 15208 52505 IO-APIC 18-fasteoi ehci_hcd:usb3, ehci_hcd:usb4 25: 0 0 0 0 PCI-MSI-edge PCIe PME, pciehp 27: 0 0 0 0 PCI-MSI-edge PCIe PME 29: 0 0 0 0 PCI-MSI-edge PCIe PME 30: 2 10 6 30 PCI-MSI-edge xhci_hcd 31: 0 0 0 0 PCI-MSI-edge xhci_hcd 32: 0 0 0 0 PCI-MSI-edge xhci_hcd 33: 0 0 0 0 PCI-MSI-edge xhci_hcd 34: 0 0 0 0 PCI-MSI-edge xhci_hcd 36: 0 1 0 795 PCI-MSI-edge eth0 37: 8895 10818 13275 52909 PCI-MSI-edge 0000:00:11.0 38: 0 0 0 0 PCI-MSI-edge ccp-0 39: 0 0 0 0 PCI-MSI-edge ccp-1 43: 43 41 33 67 PCI-MSI-edge snd_hda_intel 44: 2859971 11 26 86 IO-APIC 8-fasteoi ath9k 45: 195622 140337 161305 908424 PCI-MSI-edge fglrx[0]@PCI:0:1:0 46: 0 0 0 0 PCI-MSI-edge fglrx[1]@PCI:1:0:0 NMI: 846 76 73 80 Non-maskable interrupts LOC: 2778075 1326058 1332851 1598522 Local timer interrupts SPU: 0 0 0 0 Spurious interrupts PMI: 846 76 73 80 Performance monitoring interrupts IWI: 0 0 0 1 IRQ work interrupts RTR: 0 0 0 0 APIC ICR read retries RES: 1198530 2397416 1831870 1788606 Rescheduling interrupts CAL: 3400 2968 3613 3262 Function call interrupts TLB: 55078 63256 62325 67116 TLB shootdowns TRM: 0 0 0 0 Thermal event interrupts THR: 0 0 0 0 Threshold APIC interrupts MCE: 0 0 0 0 Machine check exceptions MCP: 92 92 92 92 Machine check polls HYP: 0 0 0 0 Hypervisor callback interrupts ERR: 1 MIS: 0 help :))