Bug 60587 - Only two p-states visible on AMD FX-8350
Summary: Only two p-states visible on AMD FX-8350
Status: CLOSED INVALID
Alias: None
Product: Power Management
Classification: Unclassified
Component: cpufreq (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: cpufreq
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2013-07-19 21:03 UTC by SGT CAPSLOCK
Modified: 2015-03-21 09:20 UTC (History)
3 users (show)

See Also:
Kernel Version: 3.10.1
Subsystem:
Regression: No
Bisected commit-id:


Attachments
acpidump / Asus Sabertooth 990FX/Gen3 R2.0 / BIOS revision 1802 (150.71 KB, text/plain)
2013-07-22 05:36 UTC, SGT CAPSLOCK
Details

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.

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