Quick question since I can find it absolutely nowhere. I’ve got a nexus 9 tablet and I have full root and modification rights. I am able to access the voltage and clock tables, also known as “DVFS Table”. Now I can modify the table via notepad. I haven’t been successful yet putting the table back in the kernel folder, however, can I actually modify the DVFS table to alter the voltages/frequencies? My primary goal is undervolting… I feel the K1 is clocked quite high in voltage for the GPU and CPU and I’m trying to experiment with lower voltages.
Thanks guys!
Here’s the code. Hopefully this wraps ok… it does on wordpad.
DVFS tables: units mV/MHz
vdd_cpu table version: p4v18
vdd_core table version: p4v11
vdd_gpu table version: p4_v10
vdd_cpu 980 980 980 980 1020 1060 1100 1150 1190 1230 1260 1260 1260 1260 1260 1260 1260 1260 1260 1260 1260 1260 1260 1260
vdd_cpu (dfll) 800 800 800 800 800 800 800 800 800 800 810 820 840 860 880 900 930 950 970 990 1010 1040 1070 1070
cpu_g 204.0 306.0 408.0 510.0 612.0 714.0 816.0 918.0 1020.0 1122.0 1224.0 1326.0 1428.0 1530.0 1632.0 1734.0 1836.0 1938.0 2014.5 2091.0 2193.0 2295.0 2397.0 2499.0
vdd_core 800 850 900 950 1000 1050 1100 1150
sdmmc4 0.0 0.0 82.0 82.0 136.0 136.0 136.0 200.0
vdd_core 800 820 850 880 910 980 1010
emc 204.0 300.0 396.0 528.0 600.0 792.0 924.0
vdd_core 800 850 900 950 1000 1050 1100 1150
disp1 192.0 247.0 306.0 342.0 400.0 432.0 474.0 535.0
pll_m 800.0 800.0 1066.0 1066.0 1066.0 1066.0 1200.0 1200.0
c3bus 180.0 336.0 420.0 504.0 600.0 684.0 720.0 720.0
dsia 402.0 500.0 750.0 750.0 750.0 750.0 750.0 750.0
dsib 402.0 500.0 750.0 750.0 750.0 750.0 750.0 750.0
host1x 108.0 156.0 204.0 252.0 348.0 384.0 408.0 408.0
mselect 102.0 102.0 204.0 204.0 204.0 204.0 408.0 408.0
pll_c 800.0 800.0 1066.0 1066.0 1066.0 1066.0 1066.0 1066.0
pll_c3 800.0 800.0 1066.0 1066.0 1066.0 1066.0 1066.0 1066.0
sbus 120.0 204.0 252.0 288.0 324.0 360.0 372.0 372.0
vic03 180.0 336.0 420.0 504.0 600.0 684.0 720.0 720.0
c2bus 120.0 228.0 276.0 348.0 396.0 444.0 456.0 456.0
c4bus 0.0 420.0 480.0 600.0 600.0 600.0 600.0 600.0
disp2 192.0 247.0 306.0 342.0 400.0 432.0 474.0 535.0
dsialp 102.0 102.0 102.0 102.0 156.0 156.0 156.0 156.0
dsiblp 102.0 102.0 102.0 102.0 156.0 156.0 156.0 156.0
hda 0.0 108.0 108.0 108.0 108.0 108.0 108.0 108.0
hda2codec_2x 0.0 48.0 48.0 48.0 48.0 48.0 48.0 48.0
hdmi 0.0 148.5 148.5 297.0 297.0 297.0 297.0 297.0
isp 0.0 420.0 480.0 600.0 600.0 600.0 600.0 600.0
msenc 120.0 228.0 276.0 348.0 396.0 444.0 456.0 456.0
nor 102.0 102.0 102.0 102.0 102.0 102.0 102.0 102.0
pciex 0.0 250.0 250.0 500.0 500.0 500.0 500.0 500.0
pll_c2 800.0 800.0 1066.0 1066.0 1066.0 1066.0 1066.0 1066.0
sdmmc1 0.0 0.0 82.0 82.0 136.0 136.0 136.0 204.0
sdmmc3 0.0 0.0 82.0 82.0 136.0 136.0 136.0 204.0
se 120.0 228.0 276.0 348.0 396.0 444.0 456.0 456.0
sor0 162.5 270.0 540.0 540.0 540.0 540.0 540.0 540.0
tsec 180.0 336.0 420.0 504.0 600.0 684.0 720.0 720.0
vde 120.0 228.0 276.0 348.0 396.0 444.0 456.0 456.0
vi 0.0 420.0 480.0 600.0 600.0 600.0 600.0 600.0
xusb_dev_src 0.0 58.3 58.3 58.3 112.0 112.0 112.0 112.0
xusb_falcon_src 0.0 336.0 336.0 336.0 336.0 336.0 336.0 336.0
xusb_fs_src 0.0 48.0 48.0 48.0 48.0 48.0 48.0 48.0
xusb_host_src 0.0 112.0 112.0 112.0 112.0 112.0 112.0 112.0
xusb_hs_src 0.0 60.0 60.0 60.0 60.0 60.0 60.0 60.0
xusb_ss_src 0.0 120.0 120.0 120.0 120.0 120.0 120.0 120.0
vdd_gpu 770 770 770 770 770 780 820 860 900 910 920 940 980 1020 1020 1070 1120 1120 1190
gbus 72.0 108.0 180.0 252.0 324.0 396.0 468.0 540.0 612.0 648.0 684.0 708.0 756.0 804.0 852.0 900.0 918.0 954.0 984.0