Bug 60587

Summary:	Only two p-states visible on AMD FX-8350
Product:	Power Management	Reporter:	SGT CAPSLOCK (sgtcapslock)
Component:	cpufreq	Assignee:	cpufreq
Status:	CLOSED INVALID
Severity:	normal	CC:	aaron.lu, nenad.b.radulovic, sgtcapslock
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	3.10.1	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	acpidump / Asus Sabertooth 990FX/Gen3 R2.0 / BIOS revision 1802

Description SGT CAPSLOCK 2013-07-19 21:03:18 UTC

Only the maximum and minimum available frequencies are recognized by the acpi-cpufreq driver for the AMD FX-8350 on an Asus Sabertooth 990FX/GEN3 2.0 motherboard.

fb@alchemy:~$ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_available_frequencies
4000000 1400000 
4000000 1400000 
4000000 1400000 
4000000 1400000 
4000000 1400000 
4000000 1400000 
4000000 1400000 
4000000 1400000

Windows is able to find intermediate pstates on this setup, though.

I'm not sure what other info to provide...

Comment 1 Aaron Lu 2013-07-22 02:39:25 UTC

Please attach acpidump:
# acpidump > acpidump.out

Comment 2 SGT CAPSLOCK 2013-07-22 05:36:28 UTC

Created attachment 106979 [details]
acpidump / Asus Sabertooth 990FX/Gen3 R2.0 / BIOS revision 1802

Other information relevant to this dump (as of the latest BIOS revision Asus has released):

[    0.270994] [Firmware Bug]: AMD-Vi: IOAPIC[9] not in IVRS table
[    0.271118] [Firmware Bug]: AMD-Vi: IOAPIC[10] not in IVRS table
[    0.271241] [Firmware Bug]: AMD-Vi: No southbridge IOAPIC found

Comment 3 Aaron Lu 2013-07-24 02:32:21 UTC

From the ACPI table, control method _PSS only contains two performance state 4GHZ and 1.4GHZ, so I don't see a problem here. My guess is that, there might be a vendor driver for performance control under Windows?

Comment 4 Nenad Radulovic 2015-03-21 09:20:44 UTC

This affects me too on M5A99FX Pro 2.0

Before fx8350 I had Phenom II X6 1100T on this board. All p-states were detected. Now with fx8350 only two p-states are detected.