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Thread: Failed to get size of gamma for output default when adding new screen resolution

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    Join Date
    Jan 2020
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    Failed to get size of gamma for output default when adding new screen resolution

    Hello everyone,


    I was always a Windows user and started using linux 2 weeks ago, I'm still learning.

    The first distribution I installed was LMint Xfce 19.3 (compatibility mode), but I noticed a slowness, probably caused by my PC hardware.

    Processor: Intel Pentium 4 (Northwood) 2.60 GHz
    RAM: 2 GB
    HD: 146 GB
    Monitor: AOC LM522 [Cod. TFT1560PSA] 15 inch LCD

    No additional drivers available for download.

    That's why I switched to Xubuntu 18.04. In the system live by the pen drive everything was fine, but when installing it permanently, the resolution of the monitor got problems. I searched some sites and could not solve using the command xrandr. The current resolution is 640x480, but my monitor is 1024x768.

    The terminal response to the xrandr command is:
    Code:
    gustavo@gustavo-STI:~$ xrandrxrandr: Failed to get size of gamma for output default
    Screen 0: minimum 640 x 480, current 640 x 480, maximum 640 x 480
    default connected 640x480+0+0 0mm x 0mm
       640x480       73.00* 
    
    gustavo@gustavo-STI:~$ cvt 1024 768
    # 1024x768 59.92 Hz (CVT 0.79M3) hsync: 47.82 kHz; pclk: 63.50 MHz
    Modeline "1024x768_60.00"   63.50  1024 1072 1176 1328  768 771 775 798 -hsync +vsync
    
    gustavo@gustavo-STI:~$ sudo xrandr --newmode "1024x768_60.00"   63.50  1024 1072 1176 1328  768 771 775 798 -hsync +vsync
    [sudo] senha para gustavo: 
    xrandr: Failed to get size of gamma for output default

    Using the command lshw -c video, your answer was:
    Code:
    gustavo@gustavo-STI:~$ sudo lshw -c video  *-display DISPONÍVEL      
           descrição: VGA compatible controller
           produto: CN700/P4M800 Pro/P4M800 CE/VN800 Graphics [S3 UniChrome Pro]
           fabricante: VIA Technologies, Inc.
           ID físico: 0
           informações do barramento: pci@0000:01:00.0
           versão: 01
           largura: 32 bits
           clock: 66MHz
           capacidades: vga_controller bus_master cap_list
           configuração: latency=32 mingnt=2
           recursos: memória:d8000000-dbffffff memória:dc000000-dcffffff memória:c0000-dffff

    In lspci, one of the results is:
    Code:
     01:00.0 VGA compatible controller: VIA Technologies, Inc. CN700/P4M800 Pro/P4M800 CE/VN800 Graphics [S3 UniChrome Pro] (rev 01)

    I also created the xorg.conf file with the code:
    Code:
     sudo Xorg :1 -configure
    and sent it to /etc/X11 without changing with the code:
    Code:
     sudo cp xorg.conf.new /etc/X11/xorg.conf
    I restarted and nothing changed.

    What can I do to fix this problem?

    Best regards,
    Gustavo
    Last edited by galves58; January 14th, 2020 at 03:37 PM.

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