I have written a patch that allows the user to tweak the
Xv hsync/vsync offset values. It works great on my
Twinhead Powerslim 600 @ 800x600 with XvHsync=-23.
I think it will work on any trident chip, but I am not
sure if TridentInit() gets called when the resolution
changes, in which case this patch may only work for a
single resolution.
There are two new variables in the XF86Config file:
XvHsync and XvVsync
These variables will adjust the hsync/vsync values by some
amount (relative to the default, so if hsync would have
been 100, and you set xvHsync=-10, hsync will be 90)
This is my first patch to X, so if people could look it
over, and if someone could submit it (or tell me how)
assuming it is apropriate, that'd be great.
Note that this patch doesn't fix the problem of the offset
getting messed up when the screen is switched off and on
from the function keys, but that is a problem for another
day.
Thanks,
.Geoff
(The patch is against CVS)
---------------------------------------------------------
diff -u clean/trident.h modified/trident.h
--- clean/trident.h Thu Nov 29 08:06:13 2001
+++ modified/trident.h Thu Nov 29 08:05:41 2001
@@ -141,6 +141,8 @@
CARD32 videoFlags;
int keyOffset;
#endif
+ int OverrideHsync;
+ int OverrideVsync;
OptionInfoPtr Options;
} TRIDENTRec, *TRIDENTPtr;
diff -u clean/trident.man modified/trident.man
--- clean/trident.man Thu Nov 29 08:06:13 2001
+++ modified/trident.man Thu Nov 29 08:05:41 2001
@@ -82,6 +82,18 @@
.BI "Option \*qNoPciBurst\*q \*q" boolean \*q
Turn off PCI burst mode, PCI Bursting is on by default.
Default: off.
+.TP
+.BI "Option \*qXvHsync\*q \*q" real \*q
+Override the default Horizontal-sync value for the Xv extension.
+This is used to center the Xv image on the screen. By default the values
+are assigned based on the video card.
+Default: undefined.
+.TP
+.BI "Option \*qXvVsync\*q \*q" real \*q
+Override the default Vertical-sync value for the Xv extension.
+This is used to center the Xv image on the screen. By default the values
+are assigned based on the video card.
+Default: undefined.
.SH "SEE ALSO"
XFree86(1), XF86Config(__filemansuffix__), xf86config(1), Xserver(1),
X(__miscmansuffix__)
.SH AUTHOR
diff -u clean/trident_dac.c modified/trident_dac.c
--- clean/trident_dac.c Thu Nov 29 08:06:14 2001
+++ modified/trident_dac.c Thu Nov 29 08:09:00 2001
@@ -436,6 +436,12 @@
pTrident->hsync -= 8;
break;
}
+ pTrident->hsync+=pTrident->OverrideHsync;
+ pTrident->vsync+=pTrident->OverrideVsync;
}
/* Enable Chipset specific options */
diff -u clean/trident_driver.c modified/trident_driver.c
--- clean/trident_driver.c Thu Nov 29 08:06:15 2001
+++ modified/trident_driver.c Thu Nov 29 08:05:41 2001
@@ -229,7 +229,9 @@
OPTION_NOMMIO,
OPTION_NOPCIBURST,
OPTION_CYBER_SHADOW,
- OPTION_CYBER_STRETCH
+ OPTION_CYBER_STRETCH,
+ OPTION_XV_HSYNC,
+ OPTION_XV_VSYNC
} TRIDENTOpts;
static const OptionInfoRec TRIDENTOptions[] = {
@@ -246,6 +248,8 @@
{ OPTION_MMIO_ONLY, "MMIOonly", OPTV_BOOLEAN, {0}, FALSE },
{ OPTION_CYBER_SHADOW, "CyberShadow", OPTV_BOOLEAN, {0}, FALSE },
{ OPTION_CYBER_STRETCH, "CyberStretch", OPTV_BOOLEAN, {0}, FALSE },
+ { OPTION_XV_HSYNC, "XvHsync", OPTV_INTEGER, {0}, FALSE },
+ { OPTION_XV_VSYNC, "XvVsync", OPTV_INTEGER, {0}, FALSE },
{ -1, NULL, OPTV_NONE, {0}, FALSE }
};
@@ -1284,6 +1288,18 @@
&pTrident->MUXThreshold)) {
xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "MUX Threshold set to %d\n",
pTrident->MUXThreshold);
+ }
+ pTrident->OverrideHsync = 0;
+ if (xf86GetOptValInteger(pTrident->Options, OPTION_XV_HSYNC,
+ &pTrident->OverrideHsync)) {
+ xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "Xv Hsync set to %d\n",
+ pTrident->OverrideHsync);
+ }
+ pTrident->OverrideVsync = 0;
+ if (xf86GetOptValInteger(pTrident->Options, OPTION_XV_VSYNC,
+ &pTrident->OverrideVsync)) {
+ xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "Xv Vsync set to %d\n",
+ pTrident->OverrideVsync);
}
if (xf86ReturnOptValBool(pTrident->Options, OPTION_SHADOW_FB, FALSE)) {
if (!pTrident->Linear)
-----------------------------------------------------
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