[Bug 207183] New: radeon.dpm=1 with second monitor runs hot

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=207183

            Bug ID: 207183
           Summary: radeon.dpm=1 with second monitor runs hot
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.3.18
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: ehuels@gmail.com
        Regression: No

Created attachment 288315
  --> https://bugzilla.kernel.org/attachment.cgi?id=288315&action=edit
dmesg | grep -iE "drm|radeon"

for a long time, I've been searching for the reason why my card was running
fans high on Linux. (It started after a kernel update; don't know which one --
years ago) While at the time, I ran Windows on the same laptop every now and
then, it would work correctly.

My card reports `lspci | grep VGA`:

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Venus
XT [Radeon HD 8870M / R9 M270X/M370X]


Without radeon.dpm or with radeon.dpm=1, the card runs hot: within minutes fans
will run at 3300+ RPM keeping the card barely below 66 degC. Note that
`radeontop` reports an `Graphics pipe` of 0.00% most of the time.

After discovery of the setting radeon.dpm yesterday, after a few failed trials
to set the setting to '1', I set `radeon.dpm=0`. After letting the PC cool down
(turned off) and starting again, the PC ran 10 minutes without fans and is
running at 53 degC with fans running at 2100 RPM.

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