My system is randomly freezing for 2 to 3 seconds. Keyboard, display , mouse cursor even audio stop responding in those time ! Although there is no problem when I use windows. Recently I upgraded the system from 16.04 to 18.04, but still the problem persists. I think the graphics driver is the main culprit, although I am not sure. I am using Dell Inspiron N5442 , cpu : 4th Generation Intel(R) Core(TM) i3-4005U , gpu: AMD Radeon(TM) HD R5 M240 2GB DDR3 , ram: 4 Giga . I didn't install any additional driver.
Here is the output of
lshw -c video
*-display description: VGA compatible controller product: Haswell-ULT Integrated Graphics Controller vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 0b width: 64 bits clock: 33MHz capabilities: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 resources: irq:47 memory:c0000000-c03fffff memory:b0000000-bfffffff ioport:5000(size=64) memory:c0000-dffff *-display description: Display controller product: Jet XT [Radeon R5 M240] vendor: Advanced Micro Devices, Inc. [AMD/ATI] physical id: 0 bus info: pci@0000:03:00.0 version: 00 width: 64 bits clock: 33MHz capabilities: pm pciexpress msi bus_master cap_list rom configuration: driver=radeon latency=0 resources: irq:48 memory:a0000000-afffffff memory:c0500000-c053ffff ioport:3000(size=256) memory:c0540000-c055ffff