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Thanks for the work so far. A quick scan through the first NVC4 trace at hand, using upstream demmio, reveals at least 20 writes to the BLCG registers of PGRAPH and a few in PXBAR prior to altering the value of register 0x20200 (see below). We know that these are related to the clock gating you enable. Are you 110% sure that fiddling with 0x20200 bits without first setting these values can *never* cause any issues with stability or correctness, even under the weirdest of...

This adds support for enabling automatic clockgating on nvidia GPUs for Fermi and later generations. This saves a little bit of power, bringing my fermi GPU's power consumption from ~28.3W on idle to ~27W, and my kepler's idle power consumption from ~23.6W to ~21.65W. Similar to how the nvidia driver seems to handle this, we enable clockgating for each engine that supports it after

https://bugs.freedesktop.org/show_bug.cgi?id=97620 Bug ID: 97620 Summary: [REGRESSION] KMS having issues after kernel upgrade (4.5.1-1 to 4.6.4-1) Product: xorg Version: unspecified Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: critical Priority: medium