[3.5.y.z,extended,stable] Patch "drm/nouveau: fix blank LVDS screen regression on pre-nv50" has been added to staging queue

Message ID 1358916266-24356-1-git-send-email-herton.krzesinski@canonical.com
State New
Headers show

Commit Message

Herton Ronaldo Krzesinski Jan. 23, 2013, 4:44 a.m.
This is a note to let you know that I have just added a patch titled

    drm/nouveau: fix blank LVDS screen regression on pre-nv50

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see



From 8f58e4fb40d07e9d1f6be530037cc320dce9c5c1 Mon Sep 17 00:00:00 2001
From: Marcin Slusarz <marcin.slusarz@gmail.com>
Date: Tue, 18 Dec 2012 20:30:47 +0100
Subject: [PATCH] drm/nouveau: fix blank LVDS screen regression on pre-nv50

commit 92441b2263866c27ef48137be5aa6c8c692652fc upstream.

Commit 2a44e499 ("drm/nouveau/disp: introduce proper init/fini, separate
from create/destroy") started to call display init routines on pre-nv50
hardware on module load. But LVDS init code sets driver state in a way
which prevents modesetting code from operating properly.

nv04_display_init calls nv04_dfp_restore, which sets encoder->last_dpms to


nv04_lvds_dpms checks last_dpms mode (which is NV_DPMS_CLEARED) and wrongly
assumes it's a "powersaving mode", the new one (DRM_MODE_DPMS_OFF) is too,
so it skips calling some crucial lvds scripts.

Reported-by: Chris Paulson-Ellis <chris@edesix.com>
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
 drivers/gpu/drm/nouveau/nv04_dfp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)



diff --git a/drivers/gpu/drm/nouveau/nv04_dfp.c b/drivers/gpu/drm/nouveau/nv04_dfp.c
index 11c9a1a..28c7a5a 100644
--- a/drivers/gpu/drm/nouveau/nv04_dfp.c
+++ b/drivers/gpu/drm/nouveau/nv04_dfp.c
@@ -504,7 +504,7 @@  static void nv04_dfp_update_backlight(struct drm_encoder *encoder, int mode)

 static inline bool is_powersaving_dpms(int mode)
-	return (mode != DRM_MODE_DPMS_ON);
+	return mode != DRM_MODE_DPMS_ON && mode != NV_DPMS_CLEARED;

 static void nv04_lvds_dpms(struct drm_encoder *encoder, int mode)