[Bug 107784] [AMD tahiti XT] displayport broken

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107784

--- Comment #22 from Dmitrii Tcvetkov <demfloro at demfloro.ru> ---
(In reply to Dmitrii Tcvetkov from comment #21)
> (In reply to Sylvain BERTRAND from comment #20)
> > Roughly, if you have a cpu with a frequency above 4.2GHz (max unsigned
> > 32bits),
> > linux time subsystem gets broken leading to the timeouts in displayport
> > programming. Ofc, my cpu runs at 4.7GHz.
> 
> I hit the bug on AMD FX-9590 machine with RX 580 and 2 displayport monitors.
> As for you bisect wasn't successful for me and led me to network merge
> commit. 
> 
> Looks like you're right! If I downclock the CPU to 4.2 GHz then current
> mainline master (f8f65382c98a28e3c2b20) boots fine.

Relevant discussion about cf7a63ef4e0203f (x86/tsc: Calibrate tsc only once)
http://lkml.iu.edu/hypermail/linux/kernel/1809.0/03226.html

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