我在 2008 年的 Macbook 上运行 Ubuntu 18.04。我无法让 HDMI 声音正常工作。我尝试了所有方法，包括重新安装 nvidia、lightdm 和更新。:( 都不起作用。请帮忙。
xrandr 的输出：
Screen 0: minimum 320 x 200, current 1280 x 800, maximum 8192 x 8192
LVDS-1 connected primary 1280x800+0+0 (normal left inverted right x axis y axis) 286mm x 179mm
1280x800 60.22*+ 59.99 59.97 59.81 59.91
1280x720 60.00 59.99 59.86 59.74
1024x768 60.04 60.00 59.95
960x720 60.00
928x696 60.05
896x672 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
960x540 59.96 59.99 59.63 59.82
800x600 60.00 60.32 59.96 56.25
840x525 60.01 59.88
864x486 59.92 59.57
800x512 60.17
700x525 59.98
800x450 59.95 59.82
640x512 60.02
720x450 59.89
700x450 59.96 59.88
640x480 60.00 59.94 59.94
720x405 59.51 58.99
720x400 59.97
684x384 59.88 59.85
680x384 59.80 59.96
640x400 59.88 59.98 59.96
576x432 60.06
640x360 59.86 59.83 59.84 59.32
640x350 59.84
512x384 60.00
512x288 60.00 59.92
480x270 59.63 59.82
400x300 60.32 56.34
432x243 59.92 59.57
320x240 60.05
360x202 59.51 59.13
320x180 59.84 59.32
DP-1 connected 1280x800+0+0 (normal left inverted right x axis y axis) 1366mm x 768mm
1366x768 59.79 +
1920x1080i 60.00 50.00 59.94
1920x1080 30.00 25.00 24.00 29.97 23.98
1360x768 59.80 59.96
1280x800 59.81 59.91*
1152x864 60.00 59.97
1280x768 59.87
1280x720 59.86 60.00 50.00 59.94 59.74
1024x768 70.07 60.00
1024x576 59.96 59.90 59.82
960x600 60.00
960x540 59.96 59.99 59.63 59.82
800x600 70.00 65.00 60.00 60.32 56.25
840x525 69.88 60.01 59.88
864x486 59.92 59.57
720x576 50.00
800x512 60.17
700x525 70.06 59.98
800x450 59.95 59.82
720x480 60.00 59.94
640x512 60.02
720x450 59.89
700x450 59.96 59.88
640x480 60.00 60.00 59.94
720x405 59.51 58.99
720x400 70.08
684x384 59.88 59.85
680x384 59.80 59.96
640x400 59.88 59.98
576x432 70.00 60.06
640x360 59.86 59.83 59.84 59.32
512x384 70.07 60.00
512x288 60.00 59.92
480x270 59.63 59.82
400x300 60.32 56.34
432x243 59.92 59.57
320x240 60.05
360x202 59.51 59.13
320x180 59.84 59.32