[Bug 111584] "pp_od_clk_voltage" unavailable on Hawaii GPU (R9 390) - bugzilla-daemon

From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 111584] "pp_od_clk_voltage" unavailable on Hawaii GPU (R9 390)
Date: Sat, 07 Sep 2019 15:43:15 +0000	[thread overview]
Message-ID: <bug-111584-502@http.bugs.freedesktop.org/> (raw)

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https://bugs.freedesktop.org/show_bug.cgi?id=111584

            Bug ID: 111584
           Summary: "pp_od_clk_voltage" unavailable on Hawaii GPU (R9 390)
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: enhancement
          Priority: not set
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: jonasdcdm@mailbox.org

I have recently tried to overclock/undervolt my GPU (R9 390) within Linux
thanks to the "amdgpu.ppfeaturemask=0xffffffff" boot parameter, but
unfortunately the file "pp_od_clk_voltage" is not available after a reboot.

Files "pp_dpm_mclk" and "pp_dpm_sclk" however show correct states and MHz,
except that they don't show voltage information. Changing
"power_dpm_force_performance_level" to manual allows me to make changes to
these files, I can force a state to be used and overclock it, but voltages
aren't showed and can't be modified.

I have read that Southern Island GPUs were not expected to get this feature
working, and I know Vega is compatible, but I can't find anywhere if Hawaii
(CIK) hardware should be able to expose this feature. I might be missing
something.

Is there any way to undervolt my GPU under Linux at the moment?

Specs:
OS: Arch Linux
Kernel: 5.2.11.arch1-1
Mesa: 19.1.6-1
Xorg: 1.20.5-2
Boot parameters: radeon.cik_support=0 amdgpu.cik_support=1 amdgpu.dpm=1
amdgpu.dc=1 amdgpu.ppfeaturemask=0xffffffff
GPU: [AMD/ATI] Hawaii PRO [Radeon R9 290/390] (rev 80)

Feel free to ask for more details and output if needed.

Thank you for your time.

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