1 files changed, 10 insertions, 0 deletions
diff --git a/src/aticlock.c b/src/aticlock.c
index 2aa65c48..8dd79d42 100644
--- a/src/aticlock.c
+++ b/src/aticlock.c
@@ -139,6 +139,16 @@ ATIClockPreInit
                     (double)pATI->ReferenceNumerator /
                         ((double)pATI->ReferenceDenominator * 1000.0));
 
+#if defined(__sparc__)
+            if (pATI->ReferenceNumerator != 315000 &&
+                pATI->ReferenceDenominator != 11)
+            {
+                xf86DrvMsg(pScreenInfo->scrnIndex, X_INFO,
+                    "If modes do not work on Ultra 5/10 or Blade 100/150,\n"
+                    "set option \"reference_clock\" to \"28.636 MHz\"\n");
+            }
+#endif
+
             if (pATI->ProgrammableClock == ATI_CLOCK_CH8398)
             {   /* First two are fixed */
                 pScreenInfo->numClocks = 2;