[Bug 67107] Xorg starts and crashes with DPM enable

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67107

--- Comment #13 from Adam Honse <calcprogrammer1 at gmail.com> ---
To follow up with my previous comment, I tried disabling the discrete GPU.  In
my case I disable it AFTER the radeon module is loaded (because doing it the
other way around causes errors that lag the machine to an unusable state).  The
machine has no means of disabling it in the BIOS so I use the acpi_call kernel
module with the turn_off_gpu script from here:
https://github.com/mkottman/acpi_call/

What I did was start the laptop with dpm=1 and gdm set to not start
automatically so I'd boot to a text console.  Radeon module loads at boot and
KMS sets the console to the appropriate resolution.  Then I insmod the
acpi_call.ko and run the turn-off-gpu script which turns off the discrete GPU. 
Then I started gdm, logged in, and ran glxgears to confirm that the integrated
GPU was working (ran fine) and looked at Xorg.0.log to confirm radeon.dpm=1 (it
did).  This was on battery power, haven't tested plugged in.  I'm downloading
Open Arena now to see if gaming performance is improved.  Using xrandr
--listproviders confirms that only one GPU is active and available which is the
integrated one.

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