[Bug 23508] CRT Refresh rate wrong

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=23508





--- Comment #8 from Alex Deucher <agd5f at yahoo.com>  2009-09-02 08:16:27 PST ---
(In reply to comment #3)
> Hi,
> I've done as you suggested and put the Preferred Mode option into my config
> file - hasn't made any difference - The server/driver/xrandr *thinks* the
> screen is being driven at 85Hz - but it's still 82Hz.
> 
> There *has* to be something broken somewhere - I've been using this PC with
> Linux for about nine months and have only been getting headaches in the last
> two.  And I haven't been changing the config file at all until I got the
> headaches.
> 
> The Modeline is exactly the same as on a Mandriva 2007 partition which drives
> exactly the same monitor at 85Hz.

Are you sure the Mandriva partition is using the exact same modeline?  Slight
differences in timings may affect perceived clock.  You might try adjusting the
modeline.  here are some example using cvt:
# 1400x1050 84.96 Hz (CVT 1.47M3) hsync: 93.88 kHz; pclk: 179.50 MHz
Modeline "1400x1050_85.00"  179.50  1400 1512 1656 1912  1050 1053 1057 1105
-hsync +vsync
# 1400x1050 85.08 Hz (CVT) hsync: 94.01 kHz; pclk: 179.75 MHz
Modeline "1400x1050_85.20"  179.75  1400 1512 1656 1912  1050 1053 1057 1105
-hsync +vsync


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