[Bug 91880] Radeonsi on Grenada cards (r9 390) exceptionally unstable and poorly performing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91880

--- Comment #128 from Jan Ziak <0xe2.0x9a.0x9b at gmail.com> ---
(In reply to Chris Waters from comment #127)
> Second question, is there any way to just force the memory clock to stay at
> 1500MHz? If the bug is caused by memory switching (and not the memory being
> clocked way too high), then forcing the memory to stay at the max standard
> clock should give us the stability of 150MHz.

Some months ago, I thought it was just mclk switching. But today I am not so
sure about it.

Executing the following steps on my machine with an R9 390:

- lock mclk to 1500MHz
- start playing Mad Max via Steam
- switch to the game map via gamepad or keyboard
(https://www.google.sk/search?q=mad+max+game+map&tbm=isch)

results in noticeable screen image flickering.

If I disable the lowest 300 MHz shader clock, so that the minimum shader clock
is 500 MHz and maximum is 1000 MHz, the flickering disappears.

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