Hello all, I've now concluded that the problem is a pcie issue, follows is a post to my local Linux Users group. I hope this has a bit more information to help get a resolution.
I had my old desktop die and needed to get work done, so I bought a system off the shelf from a computer shop, 8th gen i7 Asus Prime H310M-E R2.0 16 mg DDR4 Ram 2666, Nvidia 710 graphics. The motherboard has an M2 sata slot which is also pcie x2.
I've been using linux since 1998 but I'm just a reasonably competent self taught user.
The system seems to overheat on Linux. Running top from a screenshot I have CPU 6.0 us, 11.7 sy 0.0 ni 80.8 id, I take it that is 80% idle.
Systemd+ 997 root Pr 20 NI 0 446872 298632 shr 296984 S R %CPU 99.0 Mem 1.8
IrQ/122+ 184 root PR-51 NI 0 Virt 0 Res 0 SHR 0 S R %CPU 36.3
Don't know what most of that is but in comparison to my laptop which is running Ubuntu, Systemd is very very small on that.
When I booted the live Mint DVD I got a lot of scrolling on the screen at high speed, I managed to take a photo of it, it reads: 125.008462 pcieport 0000:00"1c.5: PCIE bus error: severity =Corrected, type=Physical Layer, (Receiver ID) device [8086:a295] error status/mask=00000001/00002000 [ 0] RxErr This is repeated but the 125.00number at the start is increasing while the device8086:a295 is the same.
Mint worked but there were some errors on the display including a little bar under the mouse pointer.
Manjaro worked with everything succeeding in the boot process but it would freeze and become unresponsive after about ten minutes, from the boot dvd and from after I installed it.
Fedora Workstation works but when it shuts down from the usb stick I see these pcie messages just before it closes.
All of them have high fan activity and the CPU is still hot when I get back into the BIOS, around 45 degrees. By contrast Fedora on the Laptop is very quiet with minimal cpu activity no errors and just the usual fans turning on briefly when there is a bit of activity.
I checked online and found a reference where CUPS was causing systemd problems, I ran a command to shut CUPS down but it made no difference. I would think in this case it is the pcie problem doing it.
I'm 80% happy with the system I bought but would like Linux on it. One option might be to take it back and pay for a motherboard replacement, any suggestions welcome on a good linux motherboard for i7 8th gen. Or better still a fix for this issue.
This is the motherboard: https://www.asus.com/au/Motherboards/PRIME-H310M-E-R2-0/
I found a list of Asus motherboards and Linux https://dlcdnimgs.asus.com/websites/global/aboutASUS/OS/Linux-Status-report-201810.pdf?_ga=2.2678484...
That list does show models of the Prime running linux, possibly not my "E" variant due to the list being a few years old.
PRIME H310M-A R2.0 Fedora 28 N/A N/A Ubuntu 18.04
PRIME H310M-C N/A N/A RedHat 7.4 N/A
PRIME H310M-D N/A OpenSUSE 42.3 N/A N/A
PRIME H310M-D R2.0 Fedora 28 N/A N/A Ubuntu 18.04
PRIME H310M-DASH Fedora v27 OpenSUSE 15.0 RedHat 7.5 Ubuntu 18.04
PRIME H310-PLUS R2.0 Fedora 28 N/A N/A Ubuntu 18.04