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-rw-r--r--src/radeon_mergedfb.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/radeon_mergedfb.c b/src/radeon_mergedfb.c
index 313dda2..6f3288f 100644
--- a/src/radeon_mergedfb.c
+++ b/src/radeon_mergedfb.c
@@ -212,6 +212,12 @@ RADEONCopyModeNLink(ScrnInfoPtr pScrn, DisplayModePtr dest,
mode->VSyncEnd += dy;
mode->VTotal += dy;
+ /* This is needed for not generating negative refesh rates in xrandr with the
+ faked DotClock below
+ */
+ if (!(mode->VRefresh))
+ mode->VRefresh = mode->Clock * 1000.0 / mode->HTotal / mode->VTotal;
+
/* Provide a sophisticated fake DotClock in order to trick the vidmode
* extension to allow selecting among a number of modes whose merged result
* looks identical but consists of different modes for CRT1 and CRT2