This little patch adds support for lcd-panel backlight
enabling/disabling (according to the dpms mode) for GeForce2 Go
chipsets. It has only been tested on a Dell Inspiron 8100.
I determined the necessary register values by comparing register dumps
before and after BIOS-initiated disabling of the backlight. (BIOS
control only works with a non-ACPI enabled kernel) In the particular
byte that is masked and set, the 0x01 bit appears to enable/disable the
backlight and the 0x10 bit the lcd panel itself. The other bits have no
function that I could see, but they're also set to the same values that
the BIOS sets them.
--- xc/programs/Xserver/hw/xfree86/drivers/nv/nv_driver.c.bak 2004-04-05
02:13:51.000000000 +0200
+++ xc/programs/Xserver/hw/xfree86/drivers/nv/nv_driver.c 2004-06-05
19:44:56.000000000 +0300
@@ -1623,6 +1623,17 @@
}
#endif
+ if((pNv->Chipset == 0x10DE0112))
+ {
+ /* GeForce2 Go */
+ CARD32 tmp_pcrt;
+ tmp_pcrt = pNv->PCRTC0[0x081C/4] & 0xFFFFFF00;
+ if(on) {
+ tmp_pcrt |= 0x55;
+ }
+ pNv->PCRTC0[0x081C/4] = tmp_pcrt;
+ }
+
/* cut the TMDS output */
if(on) fpcontrol |= pNv->fpSyncs;
else fpcontrol |= 0x20000022;
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