[Bug 115321] New: radeon runpm falsely disabled on Clevo P170EM

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=115321

            Bug ID: 115321
           Summary: radeon runpm falsely disabled on Clevo P170EM
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.6-rc1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: haagch.christoph at googlemail.com
        Regression: No

Created attachment 210811
  --> https://bugzilla.kernel.org/attachment.cgi?id=210811&action=edit
dmesg

Commit e64c952efb8e0c15ae82cec8e455ab4910690ef1 disables runpm when "laptops
don't provide an ACPI method to control dGPU power".

Up to now, runpm worked fine for me, but this commit disabled it also for me.
There are some ACPI errors that maybe have something to do with it:

[    3.245994] vga_switcheroo: enabled
[    3.246040] ATPX version 1, functions 0x00000033
[    3.278214] ACPI Error: Field [TMPB] at 294912 exceeds Buffer [ROM1] size
262144 (bits) (20160108/dsopcode-236)
[    3.278218] ACPI Error: Method parse/execution failed [\_SB.PCI0.GFX0.ATRM]
(Node ffff88080e8daa50), AE_AML_BUFFER_LIMIT (20160108/psparse-542)
[    3.278224] failed to evaluate ATRM got AE_AML_BUFFER_LIMIT

Full 4.6-rc1 dmesg is attached.

Meanwhile I changed this function:

bool radeon_has_atpx_dgpu_power_cntl(void) {
    return true; //radeon_atpx_priv.atpx.functions.power_cntl;
}

and runpm works again. The uvd and vce errors seen in the dmesg also vanished
after this change and a reboot.

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