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Thread: Cannot change resolution on laptop

  1. #1
    Join Date
    Jul 2009
    Location
    Germany
    Beans
    47
    Distro
    Kubuntu 10.10 Maverick Meerkat

    Cannot change resolution on laptop

    Hello forum,

    I have Kubuntu 9.10 running on a Dell Vostro 1720 with 17" display with a resolution of 1920x1200. The graphics card is a GeForce 9600M GS and I am using the nvidia driver for it. At 1920x1200 everything works really well, my problem is that I can't change to a lower resolution. I've tried adding new resolutions in xorg.conf,
    but that just resulted in warnings like
    (WW) NVIDIA(0): No valid modes for "DFP:640x480+0+0"; removing.
    in the Xorg.0.log. I've also played around with xrandr, but there I could not add new modes, because I failed to figure out how to call my output...

    After some searching I found out about EDID, and tried get-edid, which got me an error message:
    Code:
    $ sudo get-edid
    get-edid: get-edid version 2.0.0
    
            Performing real mode VBE call
            Interrupt 0x10 ax=0x4f00 bx=0x0 cx=0x0
            Function supported
            Call successful
    
            VBE version 300
            VBE string at 0x2110 "NVIDIA"
    
    VBE/DDC service about to be called
            Report DDC capabilities
    
            Performing real mode VBE call
            Interrupt 0x10 ax=0x4f15 bx=0x0 cx=0x0
            Function supported
            Call successful
    
            Monitor and video card combination does not support DDC1 transfers
            Monitor and video card combination does not support DDC2 transfers
            0 seconds per 128 byte EDID block transfer
            Screen is not blanked during DDC transfer
    
    Reading next EDID block
    
    VBE/DDC service about to be called
            Read EDID
    
            Performing real mode VBE call
            Interrupt 0x10 ax=0x4f15 bx=0x1 cx=0x0
            Function supported
            Call failed
    
    The EDID data should not be trusted as the VBE call failed
    Error: output block unchanged
    So it looks like this could be the problem. But I hesitated to use Options like IgnoreEDID because I really do not want to inflict any damage to my display... This is a laptop, and it would be pretty worthless with the display broke. Can anybody tell me how I could convince XServer of allowing other resolutions as well?

    Thank you all in advance!

  2. #2
    Join Date
    Jul 2009
    Location
    Germany
    Beans
    47
    Distro
    Kubuntu 10.10 Maverick Meerkat

    Re: Cannot change resolution on laptop

    Now I managed to get one step further with xrandr. It took me literally days to figure out that my outputs name is "default"...
    Anyway, now I can create new modes and get this error
    Code:
    $ cvt 640 480
    # 640x480 59.38 Hz (CVT 0.31M3) hsync: 29.69 kHz; pclk: 23.75 MHz
    Modeline "640x480_60.00"   23.75  640 664 720 800  480 483 487 500 -hsync +vsync
    $ xrandr --newmode "640x480_60.00"   23.75  640 664 720 800  480 483 487 500 -hsync +vsync
    $ xrandr --addmode default 640x480_60.00
    $ xrandr --output default --mode 640x480_60.00
    X Error of failed request:  BadMatch (invalid parameter attributes)
      Major opcode of failed request:  153 (RANDR)
      Minor opcode of failed request:  7 (RRSetScreenSize)
      Serial number of failed request:  20
      Current serial number in output stream:  21
    Funnily though, the last command only shows this error every second time I run it. The other times the screen goes mostly black (still showing some parts of my yakuake-terminal though, the resolution still is the old one) and then says
    Code:
    xrandr: Configure crtc 0 failed
    Can anybody help me out there?

  3. #3
    Join Date
    Jul 2009
    Location
    Germany
    Beans
    47
    Distro
    Kubuntu 10.10 Maverick Meerkat

    Re: Cannot change resolution on laptop

    Can't anybody help me out? I tried a lot already but I am no expert and don't know what I could try next.

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