por que meu segundo monitor está preso em 4: 3 em 1024X768

Question

Eu tenho usado um segundo monitor por um tempo agora, e até conectá-lo à nossa TV via porta VGA, tudo correu bem.

Então, ontem de manhã, depois que desconectei o cabo VGA da TV e o conectei ao segundo monitor, fiquei surpreso ao ver que a resolução estava ajustada para apenas 1024x768, em vez do 1680X1050 que deveria ser.

Seguindo as instruções que encontrei em Resolução de tela em 1024x768 , consegui adicione uma nova resolução de 1366x768, no entanto, os ícones de cima são metade da tela, e os outros ícones no segundo monitor ainda são enormes. Outro problema nessa resolução é que há cerca de um quarto da tela não visível entre os dois monitores.

Eu tentei adicionar 1680X1050 com xrandx , mas isso me disse xrandr: cannot find mode "1680x1050"

• O segundo monitor é um ViewSonic VA2016w
• Memória: 6 GiB
• Processador: CPU Intel® Core ™ i3-2350M a 2.30GHz × 4
• Gráficos: Intel® Sandybridge Mobile - 2 GiB
• SO: Ubuntu 13.04 64 bits
• Não há drivers proprietários usados, instalados ou oferecidos.
• Modos oferecidos agora: 1024 x 768, 800 x 600 e 1366 x 768
• A resolução foi de 1680x1050, conforme mostrado aqui e a folha de dados completa aqui .

Se alguém tiver algum conselho ou sugestão sobre como resolver isso, eu ficaria muito grato.

Obrigado antecipadamente.

UPDATE

Após a reinicialização, as resoluções foram redefinidas para Exibição espelhada com o monitor ViewSonic definido como 1024x768 (4: 3) ou 800x600 (4: 3)

could not assign CRTCs to outputs: 
Trying modes for CRTC 63 
CRTC 63: trying mode 1366x768@60Hz with output at 1366x768@60Hz (pass 0) 
    none of the selected modes were compatible with the possible modes: 
Trying modes for CRTC 63 
CRTC 63: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 848x480@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 848x480@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 1) 
Trying modes for CRTC 64 
CRTC 64: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 848x480@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 848x480@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 1) 

CRTC 63: trying mode 1360x768@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 1360x768@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 1366x768@60Hz with output at 1366x768@60Hz (pass 1) 
    none of the selected modes were compatible with the possible modes: 
Trying modes for CRTC 63 
CRTC 63: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 848x480@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 848x480@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 1) 
Trying modes for CRTC 64 
CRTC 64: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 848x480@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 848x480@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 1) 

CRTC 63: trying mode 1360x768@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 1360x768@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 1) 
Trying modes for CRTC 64 
CRTC 64: trying mode 1366x768@60Hz with output at 1366x768@60Hz (pass 0) 
    none of the selected modes were compatible with the possible modes: 
Trying modes for CRTC 63 
CRTC 63: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 848x480@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 848x480@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 1) 
Trying modes for CRTC 64 
CRTC 64: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 848x480@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 848x480@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 1) 

CRTC 64: trying mode 1360x768@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 1360x768@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 1366x768@60Hz with output at 1366x768@60Hz (pass 1) 
    none of the selected modes were compatible with the possible modes: 
Trying modes for CRTC 63 
CRTC 63: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 848x480@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 63: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 848x480@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 63: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 1) 
Trying modes for CRTC 64 
CRTC 64: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 848x480@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 0) 
CRTC 64: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 848x480@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 1) 

CRTC 64: trying mode 1360x768@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 1360x768@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 1024x768@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 800x600@60Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 800x600@56Hz with output at 1366x768@60Hz (pass 1) 
CRTC 64: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 1) 

    

Answer 1

Apenas pelo inferno disso.

Um cabo VGA transporta um sinal analógico e o comprimento máximo diminui à medida que a resolução aumenta. Assim, 1024x768 podem ser executados com eficiência em um cabo de 9 metros, mas 1600x1200 @ 60Hz não funcionarão bem além de 1 metro.

Suas opções são usar repetidores (o que não é viável) ou usar DVI. Já que é digital, pode transportar o sinal por mais tempo, mesmo com altas resoluções, até 9 metros.

    

Answer 2

Era o cabo do monitor.

Um novo cabo de monitor de 5 metros falhou!

Quando reverti para um cabo de 2 metros, funcionou bem.

    

Answer 3

Na mesma linha da solução fornecida por @simplysimon e explicada por @mitch, encontrei um problema semelhante com uma solução bizarra semelhante.

Eu tenho usado um Viewsonic VA1918wm como um monitor secundário conectado via uma porta VGA, juntamente com um monitor principal usando uma porta HDMI, por algum tempo e que tem uma resolução ideal de 1440x900. O sistema operacional instalado é o Ubuntu 14.04.1. Alguns dias atrás, durante a reinicialização, a resolução do monitor caiu e a opção All Settings > Displays do monitor secundário mostrou apenas duas resoluções inferiores como opções - 1024x768 (4: 3) e 800x600 (4: 3) - no menu suspenso Resolution . Para resolver isso, tentei uma solução sugerida para um problema semelhante usando a caixa de seleção Mirror displays em Displays configurações, mas não avail.

Depois de ler o post de @mitch acima, eu tentei um truque de hardware

• Ter os dois monitores ligados e a exibição da tela da Área de trabalho
• Remova o cabo HDMI e aguarde alguns segundos. Isso fez com que as exibições diminuíssem momentaneamente, mas o Desktop voltou a exibir apenas o monitor secundário
• Coloque o cabo HDMI de volta. Isso fez com que a exibição fosse retomada nos dois monitores

e voila! O monitor Viewsonic voltou à sua resolução ideal e Resolution em Displays configurações mostraram uma lista maior de opções, incluindo 1440x900 (16:10)