[Bug 41248] Monitor goes black when starting TV

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=41248

--- Comment #3 from Alex Deucher <agd5f at yahoo.com> 2011-09-29 22:50:19 PDT ---
I don't have access to source code at the moment, but the following change
should fix the issue.  I'll make a proper patch in the next few days.  The
existing code has a logic error; we should only disable an output in the
hotplug handler if the monitor is physically disconnected.

Replace this code in radeon_connector_hotplug() in radeon_connectors.c:
        if (radeon_hpd_sense(rdev, radeon_connector->hpd.hpd) &&
            radeon_dp_needs_link_train(radeon_connector))
            drm_helper_connector_dpms(connector, DRM_MODE_DPMS_ON);
        else
            drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF);
with:
               if (!radeon_hpd_sense(rdev, radeon_connector->hpd.hpd))
                       drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF);
               else if (radeon_dp_needs_link_train(radeon_connector))
                       drm_helper_connector_dpms(connector, DRM_MODE_DPMS_ON);

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