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<blockquote data-quote="kjo" data-source="post: 998238" data-attributes="member: 141261">You have probably right that this issue is connected with some power saving mechanism. Running prime95 in background also results in no artifacts in streamed videos. But is something more complicated. Even though the lowest P-state (800Mhz) is set when cpu is stressed with some lower priority task streaming works fine. When there is no only a little load on the cpu streaming is full of artifacts and the same when max performace is set. &nbsp;It is rather the fault of my system than MediaPortal Tv server, so I will try to investigate the cause farther on my own. Maybe it is something hardware specific. My cpu is Pentium M 750. I will try some setting with RM CPU Clock Utility, which I'm using for some undervolting (voltages are well tested, so this is not the case <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink&nbsp; &nbsp; ;)" loading="lazy" data-shortname=";)" />). &nbsp;Than you very much for your help and suggestions <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />.[DOUBLEPOST=1369846013][/DOUBLEPOST]For now the best working solution for me is using the &quot;Run HLT command when OS idle&quot; option in RM Clock Utility. This take all idle time from the OS and prevent the CPU from entering into deeper power saving states like C2, C3 or C4, which is the probable cause of my problems with artifacts.&nbsp; In the same time it retains the CPU in relatively low power state (C1) when the system is idle.</blockquote>

[QUOTE="kjo, post: 998238, member: 141261"] You have probably right that this issue is connected with some power saving mechanism. Running prime95 in background also results in no artifacts in streamed videos. But is something more complicated. Even though the lowest P-state (800Mhz) is set when cpu is stressed with some lower priority task streaming works fine. When there is no only a little load on the cpu streaming is full of artifacts and the same when max performace is set. It is rather the fault of my system than MediaPortal Tv server, so I will try to investigate the cause farther on my own. Maybe it is something hardware specific. My cpu is Pentium M 750. I will try some setting with RM CPU Clock Utility, which I'm using for some undervolting (voltages are well tested, so this is not the case ;)). Than you very much for your help and suggestions :).[DOUBLEPOST=1369846013][/DOUBLEPOST]For now the best working solution for me is using the "Run HLT command when OS idle" option in RM Clock Utility. This take all idle time from the OS and prevent the CPU from entering into deeper power saving states like C2, C3 or C4, which is the probable cause of my problems with artifacts. In the same time it retains the CPU in relatively low power state (C1) when the system is idle. [/QUOTE]

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