Comment # 12
on bug 98897
from Tom B
Apologies for repeated comments. According to http://www.anandtech.com/show/9276/2015-15inch-retina-macbook-pros-dgpu-r9-m370x-is-cape-verde (someone else running the same GPU on windows with catalyst driver) The clock speeds are: GPU: 800mhz Memory: 1125mhz I'm not sure how that correlates to the speeds in the patch you listed: + max_sclk = 75000; + max_mclk = 80000; What is the difference between sclk and mclk? If mclk is memory clock (as suggested here: http://askubuntu.com/questions/569085/radeon-pm-info-what-are-vclk-dclk-sclk-mclk-vddc-and-vddci ) that looks way of but if it's GPU clock then 80000 (assuming 80000 means 800mhz) is correct but then I don't know what the memory clock is or how to work it out. radon_pm_info does show seemingly correct information that tallies with the patch above uvd vclk: 0 dclk: 0 power level 0 sclk: 30000 mclk: 30000 vddc: 900 vddci: 850 pcie gen: 3 It shows the same in both battery and performance mode and seems to be working correctly. In performance mode if I run a GPU intensive program such as inigine-heaven the power level, as expected, changes: uvd vclk: 0 dclk: 0 power level 4 sclk: 75000 mclk: 80000 vddc: 1025 vddci: 900 pcie gen: 3 Interestingly, when the GPU is running at power level 4, there's no flicker! So it seems to be an issue with power level 0. Despite the clocks showing the same on both "battery" and "performance" mode at power level 0, the flicker (and additional heat) only happen on "performance" mode. So the flicker is some combination of "performance" dpm state and power level 0 even though the clock speeds seem the same.
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