This patch by Adam J. Richter.

--- XFree86-4.1.0/xc/programs/Xserver/hw/xfree86/drivers/s3virge/s3v_driver.c	Tue May 29 15:51:52 2001
+++ XFree86-4.1.0/xc/programs/Xserver/hw/xfree86/drivers/s3virge/s3v_driver.c	Tue Jul 17 03:50:27 2001
@@ -1635,6 +1635,7 @@
    VGAOUT8(vgaCRReg, cr66 | 0x80);
    VGAOUT8(vgaCRIndex, 0x3a);
    cr3a = VGAIN8(vgaCRReg);
+   save->CR3A = cr3a;
    VGAOUT8(vgaCRReg, cr3a | 0x80);
 
    /* VGA_SR_MODE saves mode info only, no fonts, no colormap */
@@ -1664,7 +1665,6 @@
    VGAOUT8(vgaCRIndex, 0x36);             
    save->CR36 = VGAIN8(vgaCRReg);
    VGAOUT8(vgaCRIndex, 0x3a);             
-   save->CR3A = VGAIN8(vgaCRReg);
    if (!S3_TRIO_3D_SERIES(ps3v->Chipset)) {
      VGAOUT8(vgaCRIndex, 0x40);
      save->CR40 = VGAIN8(vgaCRReg);
@@ -2093,8 +2093,7 @@
    cr66 = VGAIN8(vgaCRReg);
    VGAOUT8(vgaCRReg, cr66 | 0x80);
    VGAOUT8(vgaCRIndex, 0x3a);
-   cr3a = VGAIN8(vgaCRReg);
-   VGAOUT8(vgaCRReg, cr3a | 0x80);
+   VGAOUT8(vgaCRReg, restore->CR3A | 0x80);
 
    /* And finally, we init the STREAMS processor if we have CR67 indicate 24bpp
     * We also restore FIFO and TIMEOUT memory controller registers. (later...)
@@ -2157,7 +2156,7 @@
    VGAOUT8(vgaCRIndex, 0x66);             
    VGAOUT8(vgaCRReg, cr66);
    VGAOUT8(vgaCRIndex, 0x3a);             
-   VGAOUT8(vgaCRReg, cr3a);
+   VGAOUT8(vgaCRReg, restore->CR3A);
 
    if (xf86GetVerbosity() > 1) {
       xf86DrvMsgVerb(pScrn->scrnIndex, X_INFO, VERBLEV,