[Bug 74931] [drm:intel_dp_start_link_train] *ERROR* too many voltage retries, give up

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https://bugzilla.kernel.org/show_bug.cgi?id=74931

lopeonline+kernelbugzilla at gmail.com changed:

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--- Comment #11 from lopeonline+kernelbugzilla at gmail.com ---
(In reply to Imre Deak from comment #4)

I was experiencing this bug with Intel graphics and Displayport.

Problem detailed symptoms:
My screens were turning off regularly. On good days they would go black for
about 2 seconds, on bad days they would turn off completely and I had to
disable and re-enable them.

I was running ubuntu 3.14.##### kernel
I recompiled the 3.13 kernel applied your patch and it works BEAUTIFULLY.

I'm still get this warning though:
[drm] Wrong MCH_SSKPD value: 0x########

Reading more about it apparently the BIOS is setting an invalid number in there
which apparently seems to cause a buffer underrun, which causes the Displaylink
device to turn off.

I'm trying a 4.x kernel now, I don't know if my system will run with it. But I
see they've totally reworked the driver source, so I'm not applying your patch
to the new kernel. I'll see how it goes.

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