drm/i915: give up on 8xx lid status

commit 7b9c5abee98c54f85bcc04bd4d7ec8d5094c73f4 upstream.

These old machines more often than not lie about their lid state.  So
don't use it to detect LVDS presence, but leave the event handler to
deal with lid open/close, when we might need to reset the mode.

Fixes kernel bug #15248

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index c2e8a45780d5..93031a75d112 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -655,8 +655,15 @@ static const struct dmi_system_id bad_lid_status[] = {
  */
 static enum drm_connector_status intel_lvds_detect(struct drm_connector *connector)
 {
+        struct drm_device *dev = connector->dev;
         enum drm_connector_status status = connector_status_connected;
 
+        /* ACPI lid methods were generally unreliable in this generation, so
+         * don't even bother.
+         */
+        if (IS_I8XX(dev))
+                return connector_status_connected;
+
         if (!dmi_check_system(bad_lid_status) && !acpi_lid_open())
                 status = connector_status_disconnected;