[Bug 88012] [bisected BYT] complete freeze after: drm/i915/vlv: WA for Turbo and RC6 to work together

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88012

--- Comment #81 from Andy Furniss <adf.lists at gmail.com> ---
My Asrock Q1900DC was originally bought to be a headless router/pvr/nas which
it now is - so no more testing of this lock from me for a long time (or so I
thought).

When putting it to its new duties I put a vanilla 4.1.1 on it (didn't patch as
being headless I don't get any i915 interrupts). All was good - uptime 100 days
varied CPU loads no issues.

USB has some xhci isoc pstate issues which were worked around by disabling USB3
in bios to force ehci driver. This issue was low level packet loss from dvb
tuners not locks.

Recently needed to re-locate and while doing so updated to 4.1.10 = hard lock
after 7 days uptime. The kernel was not the only difference as I attached a usb
printer and so have usb module and cups running now, though the printer had
been off for days when it locked.

Anyway I am back on 4.1.1 now (with printer) and will have to see how long it
lasts to be sure whether the kernel or the printer (or the move!) was the
cause.

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