First, calculate the
approximate HorizSync rate:
HorizSync = VertRefresh * (VerticalResolution + 40) / 1000
HorizSync = 75 * (768 + 40) / 1000
HorizSync = 60.68
Let??™s go plus or minus 1 kHz on this HorizSync value, and plus or minus 1 Hz on the
VertRefresh value to give the server some wiggle room:
HorzSync 59.6 - 61.6
VertRefresh 74.0 - 76.0
When we fire up the server and check the log file (Section 3.15), we find that the
server has found three VESA standard modes that fits our frequency ranges:
(**) NVIDIA(0): Validated modes for display device DFP-0:
(**) NVIDIA(0): Default mode "1024x768": 78.8 MHz, 60.1 kHz, 75.1 Hz
(**) NVIDIA(0): Default mode "640x384": 51.5 MHz, 60.2 kHz, 75.0 Hz (D)
(**) NVIDIA(0): Default mode "512x384": 39.4 MHz, 60.1 kHz, 75.1 Hz (D)
3.15
62 Chapter 3: Basic X.org Configuration
The first (selected) default mode is the one that the server will initially use (notice
that the refresh rate is 75.1 Hz, so this mode would not have been found if we??™d
specified a refresh rate of exactly 75 Hz). The two other modes are double-scan
modes, as indicated by the (D) at the end of the line, which can be selected using the
RANDR extension (Section 5.3).
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