Comment 9 for bug 1774950

I'm affected by this bug, too.
System is Acer E13 Laptop with 250G SSD, Intel Celeron N2940, 4GB RAM
Initial and only install on this system was Ubuntu 16.04(where I had to insert a parameter into GRUB to prevent another system freeze bug to occur), uprgaded flawlessly to 17.10 and then to 18.04. And since the upgrade to 18.04, this bug, as extensively described above, with the same symptoms, was present.
I fiddled a around a lot, with some hints directing me to either the fishy power management of the cpu (the above-mentioned, different bug, ostensibly originated from there) or the still-faulty new graphics driver, albeit I don't really know if that nouveau Graphics driver is even compatible with my Intel cpu graphics.
What finally solved the bug for me was the above-recommended downgrade (via ukuu) to kernel 4.14 - so no I'm running 18.04 with Kernel 4.41.41 with this bug no longer occuring

What's left to do now, I believe, is to klick away the kernel upgrade notifications and hoping for a fix in a newer kernel :)