This is a note to let you know that I've just added the patch titled
drm/nouveau: fix blank LVDS screen regression on pre-nv50 cards
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-nouveau-fix-blank-lvds-screen-regression-on-pre-nv50-cards.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 92441b2263866c27ef48137be5aa6c8c692652fc Mon Sep 17 00:00:00 2001
From: Marcin Slusarz <[email protected]>
Date: Tue, 18 Dec 2012 20:30:47 +0100
Subject: drm/nouveau: fix blank LVDS screen regression on pre-nv50 cards
From: Marcin Slusarz <[email protected]>
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
NV_DPMS_CLEARED.
drm_crtc_helper_set_mode
nv04_dfp_prepare
nv04_lvds_dpms(DRM_MODE_DPMS_OFF)
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 <[email protected]>
Signed-off-by: Marcin Slusarz <[email protected]>
Signed-off-by: Ben Skeggs <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/gpu/drm/nouveau/nv04_dfp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- 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(st
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)
Patches currently in stable-queue which might be from [email protected]
are
queue-3.4/drm-nouveau-fix-blank-lvds-screen-regression-on-pre-nv50-cards.patch
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