This enables resume from suspend level S3 by asking the Radeon chip if it
thinks it has no memory.  If so, the card is re-POSTed via the int10
interface.  Reportedly enables the driver to work for this type of
suspend/resume cycle on Dell D600 laptops (Dell D800s as well, if the video
BIOS is patched to 4.28.20.31.C1 or later). See Gentoo bug #48095 or Debian bug
#234575. This patch by Emmanuel Thome and Ole Rohne, and this info borrowed from
Debian.

--- xc/programs/Xserver/hw/xfree86/drivers/ati/radeon_driver.c	2003-10-25 00:10:20.000000000 +0200
+++ xc/programs/Xserver/hw/xfree86/drivers/ati/radeon_driver.c.new	2003-11-22 17:20:14.000000000 +0100
@@ -345,6 +345,7 @@
     "xf86InitInt10",
     "xf86FreeInt10",
     "xf86int10Addr",
+    "xf86ExecX86int10",
     NULL
 };
 
@@ -6409,9 +6410,22 @@
 {
     ScrnInfoPtr    pScrn = xf86Screens[scrnIndex];
     RADEONInfoPtr  info  = RADEONPTR(pScrn);
+    unsigned char * RADEONMMIO = info->MMIO;
 
     RADEONTRACE(("RADEONEnterVT\n"));
 
+    if (INREG(RADEON_CONFIG_MEMSIZE) == 0) { /* Softboot V_BIOS */
+      xf86Int10InfoPtr pInt;
+	xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
+	       "zero MEMSIZE, probably at D3cold. Re-POSTing via int10.\n");
+      pInt = xf86InitInt10 (info->pEnt->index);
+      if (pInt) {
+        pInt->num = 0xe6;
+        xf86ExecX86int10 (pInt);
+        xf86FreeInt10 (pInt);
+      }
+    }
+
     if (info->FBDev) {
 	unsigned char *RADEONMMIO = info->MMIO;
 	if (!fbdevHWEnterVT(scrnIndex,flags)) return FALSE;