[Intel-gfx] [PATCH] Use enable bit for LVDS detect

[Zhenyu Wang]

This looks like a promising right way to check if LVDS
is available or not. Because if LVDS is enabled on the board,
it will be used as primary display, so video bios should already
have initialized it.

Michael asked me for this, from several ModeDebug logs and my
test on aopen showed this method working. 

---
 src/i830_driver.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/src/i830_driver.c b/src/i830_driver.c
index 1407a22..2eeeb84 100644
--- a/src/i830_driver.c
+++ b/src/i830_driver.c
@@ -908,7 +908,8 @@ I830SetupOutputs(ScrnInfoPtr pScrn)
    i830_crt_init(pScrn);
 
    /* Set up integrated LVDS */
-   if (IS_MOBILE(pI830) && !IS_I830(pI830))
+   if (IS_MOBILE(pI830) && !IS_I830(pI830) &&
+	   (INREG(LVDS) & LVDS_PORT_EN))
       i830_lvds_init(pScrn);
 
    if (IS_I9XX(pI830)) {
-- 
1.5.6.5