3.5.7.4 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Marcin Slusarz <marcin.slus...@gmail.com>
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 <ch...@edesix.com>
Signed-off-by: Marcin Slusarz <marcin.slus...@gmail.com>
Signed-off-by: Ben Skeggs <bske...@redhat.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesin...@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)
--
1.7.9.5
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