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drm/i915: Fix LVDS presence check

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Assume that either the presence of an LVDS entry in the VBT or an ACPI
lid device indicates an LVDS device.  ACPI lid alone is not sufficient.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Adam Jackson 2009-11-24 10:07:00 -05:00 committed by Eric Anholt
parent 05dd8f973f
commit 38b3037ee4
1 changed files with 6 additions and 11 deletions
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17
drivers/gpu/drm/i915/intel_lvds.c
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@ -1031,19 +1031,14 @@ void intel_lvds_init(struct drm_device *dev)
if (dmi_check_system(intel_no_lvds))
return;
if (!lvds_is_present_in_vbt(dev)) {
DRM_DEBUG_KMS("LVDS is not present in VBT\n");
/*
* Assume LVDS is present if there's an ACPI lid device or if the
* device is present in the VBT.
*/
if (!lvds_is_present_in_vbt(dev) && !intel_lid_present()) {
DRM_DEBUG_KMS("LVDS is not present in VBT and no lid detected\n");
return;
}
/* Assume that any device without an ACPI LID device also doesn't
* have an integrated LVDS. We would be better off parsing the BIOS
* to get a reliable indicator, but that code isn't written yet.
*
* In the case of all-in-one desktops using LVDS that we've seen,
* they're using SDVO LVDS.
*/
if (!intel_lid_present())
return;
if (IS_IGDNG(dev)) {
if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)