[Bug 73530] Asus U38N: Black screen with Radeon driver in Linux 3.10, 3.11 and 3.12

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73530

--- Comment #51 from Paul Menzel <paulepanter at users.sourceforge.net> ---
I tried Linux 3.13 with the patch below and I could not get the 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(struct drm_encoder
*encoder,
             dp_info.dp_lane_count = dig_connector->dp_lane_count;
             dp_info.dp_clock = 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;
         }
        -- 
        1.9.rc1

I’ll post the errors tomorrow.

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