Comment 515 for bug 1690085

(In reply to Klaus Mueller from comment #427)
> (In reply to JerryD from comment #426)
> > I am on Ryzen 2500U Laptop, HP. I am using kernel 4.18.9-200.fc28.x86_64.
> >
> > The zenstates.py script fails when I try to disable C6. Oh well.
>
> Did you load msr kernel module before (modprobe msr)?
>
> Do you have the possibility to slightly overclock? Isn't there a Bios switch
> like "Typical Current Idle"? Is there a possibility to switch of C-states
> completely in the Bios (just for testing to be sure your hangs are the same
> reason as here)?

As follows:

[root@amdr jerry]# modprobe msr
[root@amdr jerry]# ./bin/zenstates.py --list
P0 - Enabled - FID = 64 - DID = A - VID = 35 - Ratio = 20.00 - vCore = 1.21875
P1 - Enabled - FID = 66 - DID = C - VID = 60 - Ratio = 17.00 - vCore = 0.95000
P2 - Enabled - FID = 60 - DID = C - VID = 66 - Ratio = 16.00 - vCore = 0.91250
P3 - Disabled
P4 - Disabled
P5 - Disabled
P6 - Disabled
P7 - Disabled
C6 State - Package - Enabled
C6 State - Core - Enabled

[root@amdr jerry]# ./bin/zenstates.py --c6-disable
Traceback (most recent call last):
  File "./bin/zenstates.py", line 112, in <module>
    writemsr(0xC0010292, readmsr(0xC0010292) & ~(1 << 32))
  File "./bin/zenstates.py", line 23, in writemsr
    raise OSError("msr module not loaded (run modprobe msr)")
OSError: msr module not loaded (run modprobe msr)

As you can see msr is loaded and listing the states works fine but the disable option fails.

The bios on this laptop has no power related options that I can see.