On Tue, 2020-02-11 at 13:33 -0500, Lyude Paul wrote:
> - if (!intel_dp_aux_display_control_capable(intel_connector))
> + /*
> + * There are a lot of machines that don't advertise the backlight
> + * control interface to use properly in their VBIOS, :\
> + */
> + if (dev_priv->vbt.backlight.type !=
> + INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
> + !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
> + DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
> + DRM_DEV_INFO(dev->dev,
> + "Panel advertises DPCD backlight support, but "
> + "VBT disagrees. If your backlight controls "
> + "don't work try booting with "
> + "i915.enable_dpcd_backlight=1. If your machine "
> + "needs this, please file a _new_ bug report on "
> + "bugs.freedesktop.org against DRI -> "
> + "DRM/Intel\n");
Bugzilla's been put out of our misery, probably this should point to
gitlab instead.
- ajax
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