Comment # 128
on bug 109955
from haro41@gmx.de
Created attachment 145901 [details] [review] 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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