From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 74551] Unable to run linux with radeon.runpm=1
Date: Thu, 17 Jul 2014 21:24:53 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=74551
--- Comment #12 from Alex Deucher ---
(In reply to maxis11 from comment #6)
> BTW runpm works with 3.12.7 and 3.12.8 (with 3.13 and later runpm=1 freezes
> laptop during boot)
runpm support didn't exist until 3.13. If "echo OFF >
/sys/kernel/debug/vgaswitcheroo/switch" has never worked, then your system has
never had functional support for turning on/off the dGPU.
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