[Bug 76321] New: Incorrect hwmon temperature when radeon card is turned off

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=76321

            Bug ID: 76321
           Summary: Incorrect hwmon temperature when radeon card is turned
                    off
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.15-rc3
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: pali.rohar at gmail.com
        Regression: No

When radeon card is turned off (automatically via runpm) sensors program show
totally incorrect temperature:

radeon-pci-0100
Adapter: PCI adapter
temp1:       +511.0°C  (crit = +120.0°C, hyst = +90.0°C)

When some opengl program is running with DRI_PRIME=1 then sensors reports:

radeon-pci-0100
Adapter: PCI adapter
temp1:        +46.0°C  (crit = +120.0°C, hyst = +90.0°C)

So kernel radeon driver should not report temperature (e.g. returns -EINVAL in
hwmon) when radeon card is turned off (via vgaswitcheroo or runpm).

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