Eu tenho um Thinkpad T440s rodando o 15.04 com a placa gráfica Intel HD 4400. Acabei de receber um monitor 4K (Dell P2415Q). De acordo com as especificações do HD4400, eu deveria ser capaz de dirigir este monitor a 30hz em resolução 4K. Eu usei este computador para fazer exatamente isso. Note que estou conectando via displayport.
A execução do xrandr dá
Screen 0: minimum 8 x 8, current 4480 x 1440, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+360 (normal left inverted right x axis y axis) 309mm x 173mm
1920x1080 60.0*+ 59.9
1680x1050 60.0 59.9
1600x1024 60.2
1400x1050 60.0
1280x1024 60.0
1440x900 59.9
1280x960 60.0
1360x768 59.8 60.0
1152x864 60.0
1024x768 60.0
800x600 60.3 56.2
640x480 59.9
DP1 connected 2560x1440+1920+0 (normal left inverted right x axis y axis) 527mm x 296mm
3840x2160 60.0 +
2560x1440 60.0*
2048x1280 60.0
1920x1200 59.9
1920x1080 60.0 60.0 50.0 59.9 30.0 25.0 24.0 30.0 24.0
1920x1080i 60.1 50.0 60.0
1600x1200 60.0
1600x900 60.0
1280x1024 75.0 60.0
1152x864 75.0
1280x720 60.0 50.0 59.9
1024x768 75.1 60.0
800x600 75.0 60.3
720x576 50.0
720x480 60.0 59.9
640x480 75.0 60.0 59.9
720x400 70.1
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
Parece que preciso adicionar um modo para executar 3840x2160 a 30 Hz.
cvt 3840 2160 30
# 3840x2160 29.98 Hz (CVT) hsync: 65.96 kHz; pclk: 338.75 MHz
Modeline "3840x2160_30.00" 338.75 3840 4080 4488 5136 2160 2163 2168 2200 -hsync +vsync
Continuando:
xrandr --newmode "3840x2160_30.00" 338.75 3840 4080 4488 5136 2160 2163 2168 2200 -hsync +vsync
xrandr --verbose --addmode DP1 "3840x2160_30.00"
Finalmente:
xrandr --output DP1 --mode "3840x2160_30.00"
Quando faço isso, o monitor pisca por um segundo e volta para 2560x1440 @ 60hz. Executando o xrandr novamente:
Screen 0: minimum 8 x 8, current 4480 x 1440, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+360 (normal left inverted right x axis y axis) 309mm x 173mm
1920x1080 60.0*+ 59.9
1680x1050 60.0 59.9
1600x1024 60.2
1400x1050 60.0
1280x1024 60.0
1440x900 59.9
1280x960 60.0
1360x768 59.8 60.0
1152x864 60.0
1024x768 60.0
800x600 60.3 56.2
640x480 59.9
DP1 connected 2560x1440+1920+0 (normal left inverted right x axis y axis) 527mm x 296mm
3840x2160 60.0 +
2560x1440 60.0*
2048x1280 60.0
1920x1200 59.9
1920x1080 60.0 60.0 50.0 59.9 30.0 25.0 24.0 30.0 24.0
1920x1080i 60.1 50.0 60.0
1600x1200 60.0
1600x900 60.0
1280x1024 75.0 60.0
1152x864 75.0
1280x720 60.0 50.0 59.9
1024x768 75.1 60.0
800x600 75.0 60.3
720x576 50.0
720x480 60.0 59.9
640x480 75.0 60.0 59.9
720x400 70.1
3840x2160_30.00 30.0
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
Não sei o que fazer daqui. Isso é um problema de hardware? Estou fazendo algo errado?