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FOSDEM09: "Aggressive" Linux power managementFOSDEM09: "Aggressive" Linux power managementPosted Feb 12, 2009 16:24 UTC (Thu) by johnkarp (subscriber, #39285)In reply to: FOSDEM09: "Aggressive" Linux power management by dlang Parent article: FOSDEM09: "Aggressive" Linux power management
Re #1, isn't video memory typically dual-ported, so that the RAMDAC can still read the memory even while the GPU is inactive?
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FOSDEM09: "Aggressive" Linux power management Posted Feb 12, 2009 16:41 UTC (Thu) by dlang (✭ supporter ✭, #313) [Link]
this will vary from video system to video system. some cards did use dual-port ram, but since some 'cards' can use your system ram, there are definantly 'cards' where that is not the case.
I don't know what's common on modern high-end cards
FOSDEM09: "Aggressive" Linux power management Posted Feb 13, 2009 8:30 UTC (Fri) by Los__D (guest, #15263) [Link]
I thought that cards using system RAM only used it for texture caches, and so on?
FOSDEM09: "Aggressive" Linux power management Posted Feb 19, 2009 22:26 UTC (Thu) by wmf (guest, #33791) [Link]
I think dual-ported VRAM was eliminated 5-10 years ago, and the RAMDAC has been part of the GPU for 10-15 years. It is probably possible to gate the command processor and shader pipelines while leaving the refresh logic on, though.
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