| Message ID | 1f339369f889faa455ced90d68773e860cf93b1a.1444670070.git.lukas@wunner.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c index 881b5d1..a84727f 100644 --- a/drivers/gpu/drm/i915/intel_lvds.c +++ b/drivers/gpu/drm/i915/intel_lvds.c @@ -1067,7 +1067,8 @@ void intel_lvds_init(struct drm_device *dev) * preferred mode is the right one. */ mutex_lock(&dev->mode_config.mutex); - edid = drm_get_edid(connector, intel_gmbus_get_adapter(dev_priv, pin)); + edid = drm_get_edid_switcheroo(connector, + intel_gmbus_get_adapter(dev_priv, pin)); if (edid) { if (drm_add_edid_modes(connector, edid)) { drm_mode_connector_update_edid_property(connector,
The pre-retina MacBook Pro uses an LVDS panel and a gmux controller to switch the panel between its two GPUs. The panel mode in VBIOS is notoriously bogus on these machines and some models have no VBIOS at all. Use drm_get_edid_switcheroo() in lieu of drm_get_edid() on LVDS. This allows us to retrieve the EDID if the outputs are currently muxed to the discrete GPU by temporarily switching the panel's DDC lines to the integrated GPU. This only enables EDID probing on the pre-retina MBP (2008 - 2013). The retina MBP (2012 - present) uses eDP and gmux is not capable of switching AUX separately from the main link on these models. This will be addressed in later patches. List of pre-retina MBPs with dual GPUs, one of them Intel: [MBP 6,2 2010 intel ILK + nvidia GT216 pre-retina 15"] [MBP 6,1 2010 intel ILK + nvidia GT216 pre-retina 17"] [MBP 8,2 2011 intel SNB + amd turks pre-retina 15"] [MBP 8,3 2011 intel SNB + amd turks pre-retina 17"] [MBP 9,1 2012 intel IVB + nvidia GK107 pre-retina 15"] Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=88861 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=61115 Tested-by: William Brown <william@blackhats.net.au> [MBP 8,2 2011 intel SNB + amd turks pre-retina 15"] Tested-by: Lukas Wunner <lukas@wunner.de> [MBP 9,1 2012 intel IVB + nvidia GK107 pre-retina 15"] Signed-off-by: Lukas Wunner <lukas@wunner.de> --- drivers/gpu/drm/i915/intel_lvds.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)