[Bug 109955] amdgpu [RX Vega 64] system freeze while gaming

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109955

--- Comment #128 from haro41 at gmx.de ---
Created attachment 145901
  --> https://bugs.freedesktop.org/attachment.cgi?id=145901&action=edit
proposed fix for crashes, caused by frequent mclk level 0/1 switches

At least one of the causes for crashes, are more frequently, if vsync is
enabled. 

In this case, memory clock levels are switched usually more frequently.
By experiments i found, that especially the transient betweeen level 1 and
level 0 is critical. The fact, that disabling memory level 0, helps as a
workaround, confirms: this approach points in the right direction.

Result of further experiments:
By sending a 'PPSMC_MSG_SetUclkDownHyst' message to smc (enabling a hysterese
feature ?), the crashes can be avoided, even with enabled mclk level 0 and
vsync activated.

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