I tried Linux 3.13 with the patch below and I could not get th=
e display to work
at all with the following script.

    while true; do xrandr --output eDP --off && xrandr --output eDP=
 --auto &&
sleep 4; done

        ---
         drivers/gpu/drm/radeon/atombios_dp.c | 8 ++++++++
         1 file changed, 8 insertions(+)

        diff --git a/drivers/gpu/drm/radeon/atombios_dp.c
b/drivers/gpu/drm/radeon/atombios_dp.c
        index fb3ae07..564bac0 100644
        --- a/drivers/gpu/drm/radeon/atombios_dp.c
        +++ b/drivers/gpu/drm/radeon/atombios_dp.c
        @@ -912,13 +912,21 @@ void radeon_dp_link_train(str=
uct drm_encoder
*encoder,
             dp_info.dp_lane_count =3D dig_connector->dp_lane_count;
             dp_info.dp_clock =3D dig_connector->dp_clock;

        +    DRM_DEBUG_KMS("Before train_init\n");
        +    msleep(10);
             if (radeon_dp_link_train_init(&dp_info))
                 goto done;
        +    DRM_DEBUG_KMS("Before train_cr\n");
        +    msleep(10);
             if (radeon_dp_link_train_cr(&dp_info))
                 goto done;
        +    msleep(10);
        +    DRM_DEBUG_KMS("Before train_ce\n");
             if (radeon_dp_link_train_ce(&dp_info))
                 goto done;
         done:
        +    msleep(10);
        +    DRM_DEBUG_KMS("Before train_finish\n");
             if (radeon_dp_link_train_finish(&dp_info))
                 return;
         }
        --=20
        1.9.rc1

I=E2=80=99ll post the errors tomorrow.