Commen=
t # 12
on bug 98897<=
/a>
from Tom =
B
Apologies for repeated comments. According to
http://www.anandtech.com/show/9276/2015-15i=
nch-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 =3D 75000;
+ max_mclk =3D 80000;
What is the difference between sclk and mclk? If mclk is memory clock (as
suggested here:
http://askubuntu.com/questions/569085/rad=
eon-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.=20
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 work=
ing
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 flicke=
r is some
combination of "performance" dpm state and power level 0 even tho=
ugh the clock
speeds seem the same.