Periodic pauses in Ubuntu 17.04

Question

I went from Ubuntu 16.04 (unity) to Ubuntu GNOME 17.04, and I'm getting periodic freezes.

Everything's going fine, I'm playing a browser game and listening to a YouTube video in the background, then the music, game, keyboard, and cursor freeze for a half second, then unfreeze (unlike 90% of reports of hanging). It happens every 5 minutes, sometimes less.

I don't see any noticeable CPU spike, and there's nothing notable in the syslogs. How do I go about tracking down the cause of the problem?

Possibly relevant:

x0a@hp-lp:~$ lspci -k | grep -EA3 'VGA|3D|Display'
00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] BeaverCreek [Radeon HD 6620G]
    DeviceName: AMD Radeon(TM) HD 6620G
    Subsystem: Hewlett-Packard Company BeaverCreek [Radeon HD 6620G]
    Kernel driver in use: radeon
x0a@hp-lp:~$

Pilot6 My PC doesn't hang indefinitely (that would require hard reset). It just pauses, then unpauses. — x0a, Jul 25 '17 at 21:31
Please [edit] your question and add output of lspci -k | grep -EA3 'VGA|3D|Display' terminal command. — Pilot6, Jul 25 '17 at 21:32
What are other specs of your comp? How much RAM you have, what is the CPU, etc. — Pilot6, Jul 25 '17 at 21:43
It's a HP Pavillion g7-1277dx laptop, with upgraded quad-core 1.9 ghz A8-3530MX AMD APU, 8GB ram, 7200 rpm SATA 3 drive. I installed the propietary microcode which seemed to help some — x0a, Jul 25 '17 at 21:54
Which pointing device are you using? Is it a mouse or a touchpad? — Pilot6, Jul 25 '17 at 21:55
Possible duplicate of Program windows turn gray and then go back to normal again — karel, Jul 26 '17 at 03:49
Pilot6 I'm using a generic wired mouse (the $5 mouse from Amazon) karel I don't think this is a low-resource problem because it was working fine in my previous Ubuntu installation, and no such problem occurs in Windows. I have the system-monitor applet enabled so I'm constantly watching RAM and cpu usage, I don't see anything out of the ordinary. — x0a, Jul 26 '17 at 04:09

Periodic pauses in Ubuntu 17.04

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