Comment 720 for bug 1690085

(In reply to raulvior.bcn from comment #634)

Ah, yes. I forgot to add kernel version:
Linux 5.0.0-25-generic #26-Ubuntu SMP Thu Aug 1 12:04:58 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

> My system reboots randomly, mostly at idle. I have tried the 'powersupply
> idle' UEFI option, but it didn't work. I have changed motherboard, RAM and
> PSU, but it still reboots/crashes, doesn't matter if it's overclocked or
> not. The system is not reliable.
>
> Currently an ASUS CROSSHAIR VI HERO, BIOS 7201 07/12/2019.
> The previous motherboard was a Gigabyte Aorus Ultra Gaming X470 with BIOS
> F40.
>
> Now I'm waiting for the next reboot (if it happens) after disabling C6
> global states in UEFI (core C6 as per zenstates.py). The next step would be
> to flash a new BIOS file containing AGESA 1.0.0.3ABB. Comment
> https://bugzilla.kernel.org/show_bug.cgi?id=196683#c623 reports no more
> stability problems with a BIOS providing that AGESA version.
>
> Has anyone used the xHCI debug capability to at least know what happens just
> before the crash/reboot?
> https://www.kernel.org/doc/html/latest/driver-api/usb/usb3-debug-port.html
>
> AFAIK, the chipset should support DbC, as the file "dbc" is listed under the
> xHCI device node in sysfs and echo "enable" to it.