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Thread: HOWTO: change resolution/refresh rate in Xorg

  1. #11
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    Re: HOWTO: change resolution/refresh rate in Xorg

    You could use "nano -w" instead of plain nano. If I remember correctly, default installation doesn't bring that as an alias. That way lines won't get messed up. If you want to tweak xorg.conf using a graphical text editor, remember to replace sudo with gksudo (GNOME) or kdesu (in KDE).
    Linux user since -98, Ubuntu user since -04.

  2. #12
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    Cool Re: HOWTO: change resolution/refresh rate in Xorg

    Love you, Heimo

    Great guide - Couldn't change resolution. did reconfigure and all the right numbers were there but then added horizSync and vsync to xorg.conf and Voila!! Boots in 1024X768 with other available modes shown in screen resolution menu. Been working on this and stumbling around in google until I found your guide. Have you one on network cards, wireless and ISA? When I did the expert install I got the ISA but the default seems to recognize the wireless but I can't make it happen.

    Thanks again

  3. #13
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    Hardy Heron (Ubuntu Development)

    Re: HOWTO: change resolution/refresh rate in Xorg

    Quote Originally Posted by mrhaffer
    Love you, Heimo
    Have you one on network cards, wireless and ISA?
    Unfortunately this is my only howto, but there are many more on these forums. And you can always start a new thread and ask specific help to your problems.

    Quote Originally Posted by mrhaffer
    Thanks again
    Glad it helped you! Thanks goes to many helpful fellows on these forums. My howto is based on advice from various sources.

    Cheers!

  4. #14
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    Re: HOWTO: change resolution/refresh rate in Xorg

    This is the most useful howto I've found for me. Now I'm blazing away in 1600x1200 (85 Hz) .

    I'm linking this post to people with resolution problems at least twice a week.
    Hackers of the world, unite!

  5. #15
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    Exclamation Re: HOWTO: change resolution/refresh rate in Xorg

    Technically this is dealing with changing screen Dimensions,
    not screen Resolution. Bring up, say, KInfoCenter and
    look at the details for the X-Server, the term Dimensions is
    for the 640x480 values or 1600x1200 values. The Resolution is
    different, typically 75 dpi, but can go much higher on modern
    displays.

    If you have, say, a laptop with a 1600x1200 screen that is only
    15 inches across you need to edit the section dealing with the monitor
    in order to set the "DisplaySize" to the millimeters of the width
    and height of your screen.

    The following is a typical result of the editing, in this case a
    1600x1200 laptop display...

    Section "Monitor"
    DisplaySize 305 229
    HorizSync 30-95
    Identifier "Generic Monitor"
    ModelName "1600X1200@75HZ"
    Option "DPMS"
    VendorName "--> LCD"
    VertRefresh 58-78
    EndSection

    (Mostly copied from a working SuSE 10.0 system, which can
    change these values graphically, without the need for an
    editor.)

    Note also this is exact for a Thinkpad A31p 1600x1200
    display, some values, like HorizSync may be different for
    different systems. The 305 and 229 are the mm's of the
    screen. You can use a ruler if you don't know your values.

    Good Luck changing the Resolution of your display.

    Phil

  6. #16
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    Re: HOWTO: change resolution/refresh rate in Xorg

    So Im trying to get 100hz refresh on my Dell 2405 widescreen LCD. I do this in windows and it gets rid of the little bit of ghosting that there is.

    What should the HorizSync and VertRefresh be?

    Code:
    Section "Monitor"
        Identifier     "DELL 2405FPW"
        Option         "DPMS"
        HorizSync     ?-?
        VertRefresh    ?-?
    EndSection

  7. #17
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    Hardy Heron (Ubuntu Development)

    Re: HOWTO: change resolution/refresh rate in Xorg

    Quote Originally Posted by MetalMusicAddict
    So Im trying to get 100hz refresh on my Dell 2405 widescreen LCD. I do this in windows and it gets rid of the little bit of ghosting that there is.

    What should the HorizSync and VertRefresh be?

    Code:
    Section "Monitor"
        Identifier     "DELL 2405FPW"
        Option         "DPMS"
        HorizSync     ?-?
        VertRefresh    ?-?
    EndSection
    According to this:

    Code:
         
    HorizSync     30-81
    VertRefresh   56-76
    But
    Code:
         
    HorizSync     30-81
    VertRefresh   60
    for highest resolutions. I don't think it's designed to run at 100Hz (TFTs rarely are, CRTs need higher refresh rates). Try values above first and see if you get rid of the ghosting. Are you using analog cable? If you're, you should probably try DVI / digital.

  8. #18
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    Re: HOWTO: change resolution/refresh rate in Xorg

    Naa. With this awesome monitor Im definitely using a DVI. On some gaming fourms is where I found the 100Hz info. A good amount of people mentioned using it so hopefully Ill have no problems. I did it on the win side no problems so far. Ill see how this goes. Thanx man.

  9. #19
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    Re: HOWTO: change resolution/refresh rate in Xorg

    Hi!

    I have a T42p, with the ATI card:

    0000:01:00.0 VGA compatible controller: ATI Technologies Inc M10 NT [FireGL Mobility T2] (rev 80)

    I have it working with the current ATI driver (I think):

    eric@communitize:~$ fglrxinfo
    display: :0.0 screen: 0
    OpenGL vendor string: ATI Technologies Inc.
    OpenGL renderer string: MOBILITY FIREGL T2 Pentium 4 (SSE2) (FireGL) (GNU_ICD)
    OpenGL version string: 2.0.5582 (8.21.7)

    display: :0.0 screen: 1
    OpenGL vendor string: ATI Technologies Inc.
    OpenGL renderer string: MOBILITY FIREGL T2 Pentium 4 (SSE2) (FireGL) (GNU_ICD)
    OpenGL version string: 2.0.5582 (8.21.7)

    I used this FAQ for installing this driver:
    http://ubuntuforums.org/showthread.php?t=78466

    I have included my dmesg output below.

    Now I want to get my Samsung SyncMaster 997DF to display at 1400x1050. I had this working with no problem when the laptop was running Windows, so I know the card/monitor can do it. It appears that the EDID from the monitor doesn't included 1400x1050, and I can't get the IgnoreEDID or NoDDC options to work with this driver. Does anyone have any suggestions?

    Relevant sections from /etc/X11/xorg.conf:

    Section "ServerLayout"
    Identifier "Default Layout"
    Screen 0 "aticonfig Screen 0" 0 0
    Screen "aticonfig Screen 1" RightOf "aticonfig Screen 0"
    InputDevice "Generic Keyboard"
    InputDevice "Configured Mouse"
    InputDevice "Synaptics Touchpad"
    EndSection

    Section "Monitor"
    Identifier "aticonfig Monitor 0"
    EndSection

    Section "Monitor"
    Identifier "aticonfig Monitor 1"
    EndSection

    Section "Device"
    Identifier "ATI Graphics Adapter 0"
    Option "NoDDC"
    Driver "fglrx"
    BusID "PCI:1:0:0"
    Option "IgnoreEDID" "on"
    EndSection

    Section "Device"
    Identifier "ATI Graphics Adapter 1"
    Option "NoDDC"
    Driver "fglrx"
    BusID "PCI:1:0:0"
    Screen 1
    Option "IgnoreEDID" "on"
    EndSection


    Section "Screen"
    Identifier "aticonfig Screen 0"
    Device "ATI Graphics Adapter 0"
    Monitor "aticonfig Monitor 0"
    DefaultDepth 24
    SubSection "Display"
    Modes "1400x1050"
    Viewport 0 0
    Depth 24
    EndSubSection
    EndSection

    Section "Screen"
    Identifier "aticonfig Screen 1"
    Device "ATI Graphics Adapter 1"
    Monitor "aticonfig Monitor 1"
    DefaultDepth 24
    SubSection "Display"
    Modes "1400x1050"
    Viewport 0 0
    Depth 24
    EndSubSection
    EndSection

    Section "DRI"
    Mode 0666
    EndSection

    eric@communitize:~$ cat /var/log/Xorg.0.log | grep WW
    (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
    (WW) The directory "/usr/share/X11/fonts/cyrillic" does not exist.
    (WW) The directory "/usr/share/X11/fonts/CID" does not exist.
    (WW) `fonts.dir' not found (or not valid) in "/var/lib/defoma/x-ttcidfont-conf.d/dirs/CID".
    (WW) Open APM failed (/dev/apm_bios) (No such file or directory)
    (WW) Ignoring request to load module GLcore
    (WW) fglrx(0): board is an unknown third party board, chipset is supported
    (WW) fglrx(1): board is an unknown third party board, chipset is supported
    (WW) fglrx(0): Option "NoDDC" is not used
    (WW) fglrx(0): Option "IgnoreEDID" is not used
    (WW) Open APM failed (/dev/apm_bios) (No such file or directory)
    (WW) Open APM failed (/dev/apm_bios) (No such file or directory)


    eric@communitize:~$ dmesg | grep fglrx
    [4294718.578000] [fglrx] Internal AGP support requested, but kernel AGP support active.
    [4294718.578000] [fglrx] Have to use kernel AGP support to avoid conflicts.
    [4294718.578000] [fglrx] Kernel AGP support doesn't provide agplock functionalit y.
    [4294718.578000] [fglrx] AGP detected, AgpState = 0x1f000217 (hardware caps of chipset)
    [4294718.579000] [fglrx] AGP enabled, AgpCommand = 0x1f000314 (selected caps)
    [4294718.785000] [fglrx] free AGP = 252440576
    [4294718.785000] [fglrx] max AGP = 252440576
    [4294718.785000] [fglrx] free LFB = 114274304
    [4294718.785000] [fglrx] max LFB = 114274304
    [4294718.785000] [fglrx] free Inv = 0
    [4294718.785000] [fglrx] max Inv = 0
    [4294718.785000] [fglrx] total Inv = 0
    [4294718.785000] [fglrx] total TIM = 0
    [4294718.785000] [fglrx] total FB = 0
    [4294718.785000] [fglrx] total AGP = 65536
    [4294718.896000] [fglrx] free AGP = 252440576
    [4294718.896000] [fglrx] max AGP = 252440576
    [4294718.896000] [fglrx] free LFB = 74424320
    [4294718.896000] [fglrx] max LFB = 74424320
    [4294718.896000] [fglrx] free Inv = 0
    [4294718.896000] [fglrx] max Inv = 0
    [4294718.896000] [fglrx] total Inv = 0
    [4294718.896000] [fglrx] total TIM = 0
    [4294718.896000] [fglrx] total FB = 0
    [4294718.896000] [fglrx] total AGP = 65536

  10. #20
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    Hardy Heron (Ubuntu Development)

    Re: HOWTO: change resolution/refresh rate in Xorg

    Quote Originally Posted by eprebys
    I have a T42p, with the ATI card:
    Hi!

    Have you tried adding custom modeline? (see first post on this thread)

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