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Old 12-01-2005, 04:46 AM   #1
tibbar
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Registered: Dec 2005
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setting monitor refresh rate


I have a Samsung 930BF TFT monitor, which can support up to 75hz refresh rate at 1280x1024.

However, under SUSE 10.0, Yast is setting it to 60hz without giving me the option to set at 75hz (it correctly identifies monitor from vendor cd).

My xorg.conf file is:

Code:
Section "Monitor"
  DisplaySize  386 290
  HorizSync    31-81
  Identifier   "Monitor[0]"
  ModelName    "SYNCMASTER 930B/930BC/930BF(DIGITAL)"
  VendorName   "SAMSUNG"
  VertRefresh  62-75
  UseModes     "Modes[0]"
EndSection

Section "Modes"
  Identifier   "Modes[0]"
  Modeline 	"1280x1024" 134.72 1280 1368 1504 1728 1024 1025 1028 1068
  Modeline 	"1280x1024" 114.54 1280 1360 1496 1712 1024 1025 1028 1062
  Modeline 	"1280x960" 126.27 1280 1368 1504 1728 960 961 964 1001
  Modeline 	"1280x960" 107.32 1280 1360 1496 1712 960 961 964 995
  Modeline 	"1280x800" 104.35 1280 1360 1496 1712 800 801 804 835
  Modeline 	"1280x800" 88.68 1280 1352 1488 1696 800 801 804 830
  Modeline 	"1152x864" 102.08 1152 1224 1352 1552 864 865 868 901
  Modeline 	"1152x864" 86.70 1152 1224 1344 1536 864 865 868 896
  Modeline 	"1280x768" 99.17 1280 1352 1488 1696 768 769 772 801
  Modeline 	"1280x768" 84.35 1280 1344 1480 1680 768 769 772 797
  Modeline 	"1024x768" 79.52 1024 1080 1192 1360 768 769 772 801
  Modeline 	"1024x768" 67.48 1024 1080 1184 1344 768 769 772 797
  Modeline 	"800x600" 47.53 800 840 920 1040 600 601 604 626
  Modeline 	"800x600" 40.19 800 832 912 1024 600 601 604 623
  Modeline 	"768x576" 43.52 768 800 880 992 576 577 580 601
  Modeline 	"768x576" 37.37 768 800 880 992 576 577 580 598
  Modeline 	"640x480" 29.84 640 664 728 816 480 481 484 501
  Modeline 	"640x480" 25.10 640 656 720 800 480 481 484 498
EndSection

Section "Screen"
  DefaultDepth 24
  SubSection "Display"
    Depth      15
    Modes      "1280x1024" "1280x960" "1280x800" "1152x864" "1280x768" "1024x768" "800x600" "768x576" "640x480" 
  EndSubSection
  SubSection "Display"
    Depth      16
    Modes      "1280x1024" "1280x960" "1280x800" "1152x864" "1280x768" "1024x768" "800x600" "768x576" "640x480" 
  EndSubSection
  SubSection "Display"
    Depth      24
    Modes      "1280x1024" "1280x960" "1280x800" "1152x864" "1280x768" "1024x768" "800x600" "768x576" "640x480" 
  EndSubSection
  SubSection "Display"
    Depth      32
    Modes      "1280x1024" "1280x960" "1280x800" "1152x864" "1280x768" "1024x768" "800x600" "768x576" "640x480" 
  EndSubSection
  SubSection "Display"
    Depth      8
    Modes      "1280x1024" "1280x960" "1280x800" "1152x864" "1280x768" "1024x768" "800x600" "768x576" "640x480" 
  EndSubSection
  Device       "Device[0]"
  Identifier   "Screen[0]"
  Monitor      "Monitor[0]"
EndSection

Section "Device"
  BoardName    "RV280 5960"
  BusID        "1:0:0"
  Driver       "radeon"
  Identifier   "Device[0]"
  Screen       0
  VendorName   "ATI"
EndSection

Section "ServerLayout"
  Identifier   "Layout[all]"
  InputDevice  "Keyboard[0]" "CoreKeyboard"
  InputDevice  "Mouse[1]" "CorePointer"
  Option       "Clone" "off"
  Option       "Xinerama" "off"
  Screen       "Screen[0]"
EndSection

Section "DRI"
    Group      "video"
    Mode       0660
EndSection
Can anyone tell me what I need to do to drive the screen at 1280x1024 @ 75hz?

(the monitor's on screen menu confirms it is currently running at 60hz)

Thanx in advance.
 
Old 12-01-2005, 04:52 AM   #2
Sargek
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Refresh

Are the horizontal and vertical refresh rates in your /etc/xorg.conf from your monitor's user manual? That would be the first thing I would check. Those rates determine what the refresh will be. I am running my Samsung 950p at 1280x1024@85 with the factory vert and horiz refresh rates.
 
Old 12-01-2005, 05:13 AM   #3
tibbar
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Registered: Dec 2005
Posts: 15

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the manual says:

Preset Timing Modes

If the signal transferred from the computer is the same as the following Preset Timing Modes, the screen will be adjusted automatically. However, if the signal differs, the screen may go blank while the power LED is on. Refer to the video card manual and adjust the screen as follows.


Display Mode Horizontal Frequency
(kHz) Vertical Frequency
(Hz)
Pixel Clock
(MHz)
Sync Polarity
(H/V)
MAC, 640 x 480 35.000 66.667 30.240 -/-
MAC, 832 x 624 49.726 74.551 57.284 -/-
MAC,1152 x 870 68.681 75.062 100.000 -/-
IBM, 640 x 350 31.469 70.086 25.175 +/-
IBM, 640 x 480 31.469 59.940 25.175 -/-
IBM, 720 x 400 31.469 70.087 28.322 -/+
VESA, 640 x 480 37.500 75.000 31.500 -/-
VESA, 640 x 480 37.861 72.809 31.500 -/-
VESA, 800 x 600 35.156 56.250 36.000 +,-/+,-
VESA, 800 x 600 37.879 60.317 40.000 +/+
VESA, 800 x 600 46.875 75.000 49.500 +/+
VESA, 800 x 600 48.077 72.188 50.000 +/+
VESA, 1024 x 768 48.363 60.004 65.000 -/-
VESA, 1024 x 768 56.476 70.069 75.000 -/-
VESA, 1024 x 768 60.023 75.029 78.750 +/+
VESA, 1152 x 864 67.500 75.000 108.00 +/+
VESA 1280 x 960 60.000 60.000 108.00 +/+
VESA, 1280 x 1024 63.981 60.020 108.00 +/+
VESA, 1280 x 1024 79.976 75.025 135.00 +/+

Synchronization
Horizontal 30 ~ 81 kHz
Vertical 56 ~ 75 Hz
Display Color
16.2M Colors
Resolution
Optimum resolution 1280 x 1024@60 Hz
Maximum resolution 1280 x 1024@75 Hz

Does this mean I will get best quality at 60Hz anyway? if so i guess no point changing it, but i would like to at least see it on this mode...

Last edited by tibbar; 12-01-2005 at 05:15 AM.
 
Old 12-01-2005, 05:27 AM   #4
Sargek
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Registered: Jan 2003
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Distribution: Debian testing
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Based on your post, I would say 1280x1024@75 because that's "maximum", but I wonder how that relates to "optimum". How does the screen look? I don't own an LCD monitor, so have no experience with what average refresh rates are. I know on CRTs I've seen high refresh rates (85, 100, 120), but not sure about LCDs. Sorry I wasn't really able to help.
 
Old 12-01-2005, 05:31 AM   #5
tibbar
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it looks pretty good as is, no flicker of any kind on white screens. so i guess i will leave it be.
 
  


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