The patch below does not apply to the 3.12-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From b25b4427e9dfba073cf9bc86603956ed395eb6e3 Mon Sep 17 00:00:00 2001
From: Ilia Mirkin <[email protected]>
Date: Wed, 11 Dec 2013 22:19:01 -0500
Subject: [PATCH] drm/nouveau: only runtime suspend by default in optimus
 configuration

The intent was to only enable it by default for optimus, e.g. see the
runtime_idle callback. The suspend callback may be called directly, e.g.
as a result of nouveau_crtc_set_config.

Reported-by: Stefan Lippers-Hollmann <[email protected]>
Signed-off-by: Ilia Mirkin <[email protected]>
Tested-by: Stefan Lippers-Hollmann <[email protected]>
Cc: [email protected]
Signed-off-by: Dave Airlie <[email protected]>

diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c 
b/drivers/gpu/drm/nouveau/nouveau_drm.c
index 7a3759f1c41a..98a22e6e27a1 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -858,6 +858,12 @@ static int nouveau_pmops_runtime_suspend(struct device 
*dev)
        if (nouveau_runtime_pm == 0)
                return -EINVAL;
 
+       /* are we optimus enabled? */
+       if (nouveau_runtime_pm == -1 && !nouveau_is_optimus() && 
!nouveau_is_v1_dsm()) {
+               DRM_DEBUG_DRIVER("failing to power off - not optimus\n");
+               return -EINVAL;
+       }
+
        nv_debug_level(SILENT);
        drm_kms_helper_poll_disable(drm_dev);
        vga_switcheroo_set_dynamic_switch(pdev, VGA_SWITCHEROO_OFF);

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