How can I change my screen resolution?

Thaidog · 12-24-2006, 09:16 PM

I have a wide screen flat panel monitor that is optimal at 1440x900.

My resolution now seems to be stuck at 1024x768.

How can I make sure that I get a 1440x900 resolution?

jschiwal · 12-24-2006, 10:43 PM

Use the command "gtf 1440 900 60 -x" to generate a modeline. LCD monitors tend to operate at 60Hz so that is what I used in the command.

Code:

gtf 1440 900 60 -x

  # 1440x900 @ 60.00 Hz (GTF) hsync: 55.92 kHz; pclk: 106.47 MHz
  Modeline "1440x900_60.00"  106.47  1440 1520 1672 1904  900 901 904 932  -HSync +Vsync

Remove the ".00" from the modeline name. If you have a: Section "Modes" section in your xorg.conf file, add it there. Otherwise add it to your "Monitor" section.

Either like this:

Code:

Section "Monitor"
  Option       "CalcAlgorithm" "XServerPool"
  DisplaySize  332 207
  HorizSync    32-48
  Identifier   "Monitor[0]"
  ModelName    "ZV5000"
  Option       "DPMS"
  VendorName   "HP"
  VertRefresh  50-70
  # 1440x900 @ 60.00 Hz (GTF) hsync: 55.92 kHz; pclk: 106.47 MHz
  Modeline "1440x900_60"  106.47  1440 1520 1672 1904  900 901 904 932  -HSync +Vsync
EndSection

or like this:

Code:

Section "Monitor"
  Option       "CalcAlgorithm" "XServerPool"
  DisplaySize  332 207
  HorizSync    32-48
  Identifier   "Monitor[0]"
  ModelName    "ZV5000"
  Option       "DPMS"
  VendorName   "HP"
  VertRefresh  50-70
  UseModes     "Modes[0]"
EndSection


Section "Modes"
  Identifier   "Modes[0]"
 # 1440x900 @ 60.00 Hz (GTF) hsync: 55.92 kHz; pclk: 106.47 MHz
  Modeline "1440x900_60"  106.47  1440 1520 1672 1904  900 901 904 932  -HSync +Vsync
EndSection

Then add "1440x900_60" to the "Modes" entry in the "Screen" section:

Code:

Section "Screen"
  DefaultDepth 24
  SubSection "Display"
    Depth      15
    Modes      "1440x900_60" "1280x1024" "1280x960" "1280x800" "1152x864" "1280x768" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480"
  EndSubSection
  SubSection "Display"
    Depth      16
    Modes      "1440x900_60" "1280x1024" "1280x960" "1280x800" "1152x864" "1280x768" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480"
  EndSubSection

These are examples. My laptops LCD won't display 1440x900. Don't use the modeline example I gave, generate your own. Hopefully it will work then.

Lastly, the xorg.conf file has its own man page.