[PATCH] xf86-video-nv: enable backlight toggling for GeForce2 Go

[Giuseppe Bilotta]

GeForce2 Go was explicitly excluded from the NVBacklightEnable() code
(purposedly, as the code used for the other chipsets on x86 has no
effect.) This caused the backlight to remain active on laptops
equipped with such a card, even when DPMS modes were active.

Fix the issue by introducing the proper registry writes to toggle the
backlight for these cards.

Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta at gmail.com>
---
 src/nv_driver.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/nv_driver.c b/src/nv_driver.c
index 5141570..ca8a18b 100644
--- a/src/nv_driver.c
+++ b/src/nv_driver.c
@@ -2176,8 +2176,15 @@ static void NVBacklightEnable(NVPtr pNv,  Bool on)
 #endif
     
     if(pNv->LVDS) {
-       if(pNv->twoHeads && ((pNv->Chipset & 0x0ff0) != 0x0110)) {
-           pNv->PMC[0x130C/4] = on ? 3 : 7; 
+       if(pNv->twoHeads) {
+           if((pNv->Chipset & 0x0ff0) != 0x0110) {
+               pNv->PMC[0x130C/4] = on ? 3 : 7; 
+           } else {
+               CARD32 tmp_pcrt;
+               tmp_pcrt = pNv->PCRTC0[0x081C/4] & 0xFFFFFFFC;
+               if(on) tmp_pcrt |= 0x1;
+               pNv->PCRTC0[0x081C/4] = tmp_pcrt;
+           }
        }
     } else {
        CARD32 fpcontrol;
-- 
1.5.3.2