我想xrandr根据我的第二台显示器（智能电视）是否打开或关闭来自动更改我的设置。
我能想到的任何检查或实用程序都无法区分关闭（待机）和打开（“等待信号”）状态。然而，打开电视会导致 中出现四个事件udevadm monitor --property，所以我确信一些系统的一部分必须了解电视的状态......
KERNEL[14640.475012] change /devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/drm/card0 (drm)
ACTION=change
DEVPATH=/devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/drm/card0
SUBSYSTEM=drm
HOTPLUG=1
CONNECTOR=99
DEVNAME=/dev/dri/card0
DEVTYPE=drm_minor
SEQNUM=4821
MAJOR=226
MINOR=0
UDEV [14640.477739] change /devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/drm/card0 (drm)
ACTION=change
DEVPATH=/devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/drm/card0
SUBSYSTEM=drm
HOTPLUG=1
CONNECTOR=99
DEVNAME=/dev/dri/card0
DEVTYPE=drm_minor
SEQNUM=4821
USEC_INITIALIZED=7772035
ID_PATH=pci-0000:03:00.0
ID_PATH_TAG=pci-0000_03_00_0
ID_FOR_SEAT=drm-pci-0000_03_00_0
MAJOR=226
MINOR=0
DEVLINKS=/dev/dri/by-path/pci-0000:03:00.0-card
TAGS=:master-of-seat:seat:uaccess:
CURRENT_TAGS=:master-of-seat:seat:uaccess:
KERNEL[14641.187063] change /devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/drm/card0 (drm)
ACTION=change
DEVPATH=/devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/drm/card0
SUBSYSTEM=drm
HOTPLUG=1
CONNECTOR=99
DEVNAME=/dev/dri/card0
DEVTYPE=drm_minor
SEQNUM=4822
MAJOR=226
MINOR=0
UDEV [14641.188317] change /devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/drm/card0 (drm)
ACTION=change
DEVPATH=/devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/drm/card0
SUBSYSTEM=drm
HOTPLUG=1
CONNECTOR=99
DEVNAME=/dev/dri/card0
DEVTYPE=drm_minor
SEQNUM=4822
USEC_INITIALIZED=7772035
ID_PATH=pci-0000:03:00.0
ID_PATH_TAG=pci-0000_03_00_0
ID_FOR_SEAT=drm-pci-0000_03_00_0
MAJOR=226
MINOR=0
DEVLINKS=/dev/dri/by-path/pci-0000:03:00.0-card
TAGS=:master-of-seat:seat:uaccess:
CURRENT_TAGS=:master-of-seat:seat:uaccess:
/var/log/Xorg.0.log每当电视从待机状态切换到打开状态时，我还可以看到消息：
[ 18229.550] (II) AMDGPU(0): EDID vendor "HPN", prod id 14116
[ 18229.550] (II) AMDGPU(0): Using hsync ranges from config file
[ 18229.550] (II) AMDGPU(0): Using vrefresh ranges from config file
[ 18229.550] (II) AMDGPU(0): Printing DDC gathered Modelines:
[ 18229.551] (II) AMDGPU(0): Modeline "2560x1440"x0.0 241.50 2560 2608 2640 2720 1440 1443 1448 1481 +hsync -vsync (88.8 kHz eP)
[ 18229.551] (II) AMDGPU(0): Modeline "2560x1440"x0.0 604.25 2560 2608 2640 2720 1440 1443 1448 1543 +hsync -vsync (222.2 kHz e)
[ 18229.551] (II) AMDGPU(0): Modeline "2560x1440"x0.0 497.75 2560 2608 2640 2720 1440 1443 1448 1525 +hsync +vsync (183.0 kHz e)
[ 18229.551] (II) AMDGPU(0): Modeline "2560x1440"x0.0 304.25 2560 2608 2640 2720 1440 1443 1448 1492 +hsync -vsync (111.9 kHz e)
[ 18229.551] (II) AMDGPU(0): Modeline "1920x1080"x0.0 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync (67.5 kHz e)
[ 18229.551] (II) AMDGPU(0): Modeline "1280x720"x0.0 74.25 1280 1390 1430 1650 720 725 730 750 +hsync +vsync (45.0 kHz e)
[ 18229.551] (II) AMDGPU(0): Modeline "720x480"x0.0 27.00 720 736 798 858 480 489 495 525 -hsync -vsync (31.5 kHz e)
[ 18229.551] (II) AMDGPU(0): Modeline "640x480"x0.0 25.18 640 656 752 800 480 490 492 525 -hsync -vsync (31.5 kHz e)
[ 18229.551] (II) AMDGPU(0): Modeline "1920x1080"x0.0 297.00 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync (135.0 kHz e)
[ 18229.551] (II) AMDGPU(0): Modeline "1920x1080"x0.0 297.00 1920 2448 2492 2640 1080 1084 1094 1125 +hsync +vsync (112.5 kHz e)
[ 18229.551] (II) AMDGPU(0): Modeline "800x600"x0.0 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync (37.9 kHz e)
[ 18229.551] (II) AMDGPU(0): Modeline "720x400"x0.0 28.32 720 738 846 900 400 412 414 449 -hsync +vsync (31.5 kHz e)
[ 18229.551] (II) AMDGPU(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz e)
[ 18229.551] (II) AMDGPU(0): Modeline "1920x1200"x0.0 193.25 1920 2056 2256 2592 1200 1203 1209 1245 -hsync +vsync (74.6 kHz e)
[ 18229.551] (II) AMDGPU(0): Modeline "1680x1050"x0.0 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync (65.3 kHz e)
[ 18229.551] (II) AMDGPU(0): Modeline "(null)"x59.9 118.25 1600 1696 1856 2112 900 903 908 934 -hsync +vsync (56.0 kHz e)
[ 18229.551] (II) AMDGPU(0): Modeline "1440x900"x0.0 106.50 1440 1520 1672 1904 900 903 909 934 -hsync +vsync (55.9 kHz e)
[ 18229.551] (II) AMDGPU(0): Modeline "1280x1024"x0.0 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[ 18229.551] (II) AMDGPU(0): Modeline "1280x800"x0.0 83.50 1280 1352 1480 1680 800 803 809 831 -hsync +vsync (49.7 kHz e)
[ 18230.263] (--) AMDGPU(0): HDMI max TMDS frequency 300000KHz
[ 18230.266] (II) AMDGPU(0): EDID vendor "HPN", prod id 14116
[ 18230.266] (II) AMDGPU(0): Using hsync ranges from config file
[ 18230.266] (II) AMDGPU(0): Using vrefresh ranges from config file
[ 18230.266] (II) AMDGPU(0): Printing DDC gathered Modelines:
[ 18230.266] (II) AMDGPU(0): Modeline "2560x1440"x0.0 241.50 2560 2608 2640 2720 1440 1443 1448 1481 +hsync -vsync (88.8 kHz eP)
[ 18230.266] (II) AMDGPU(0): Modeline "2560x1440"x0.0 604.25 2560 2608 2640 2720 1440 1443 1448 1543 +hsync -vsync (222.2 kHz e)
[ 18230.266] (II) AMDGPU(0): Modeline "2560x1440"x0.0 497.75 2560 2608 2640 2720 1440 1443 1448 1525 +hsync +vsync (183.0 kHz e)
[ 18230.266] (II) AMDGPU(0): Modeline "2560x1440"x0.0 304.25 2560 2608 2640 2720 1440 1443 1448 1492 +hsync -vsync (111.9 kHz e)
[ 18230.266] (II) AMDGPU(0): Modeline "1920x1080"x0.0 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync (67.5 kHz e)
[ 18230.266] (II) AMDGPU(0): Modeline "1280x720"x0.0 74.25 1280 1390 1430 1650 720 725 730 750 +hsync +vsync (45.0 kHz e)
[ 18230.266] (II) AMDGPU(0): Modeline "720x480"x0.0 27.00 720 736 798 858 480 489 495 525 -hsync -vsync (31.5 kHz e)
[ 18230.266] (II) AMDGPU(0): Modeline "640x480"x0.0 25.18 640 656 752 800 480 490 492 525 -hsync -vsync (31.5 kHz e)
[ 18230.266] (II) AMDGPU(0): Modeline "1920x1080"x0.0 297.00 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync (135.0 kHz e)
[ 18230.266] (II) AMDGPU(0): Modeline "1920x1080"x0.0 297.00 1920 2448 2492 2640 1080 1084 1094 1125 +hsync +vsync (112.5 kHz e)
[ 18230.266] (II) AMDGPU(0): Modeline "800x600"x0.0 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync (37.9 kHz e)
[ 18230.266] (II) AMDGPU(0): Modeline "720x400"x0.0 28.32 720 738 846 900 400 412 414 449 -hsync +vsync (31.5 kHz e)
[ 18230.266] (II) AMDGPU(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz e)
[ 18230.266] (II) AMDGPU(0): Modeline "1920x1200"x0.0 193.25 1920 2056 2256 2592 1200 1203 1209 1245 -hsync +vsync (74.6 kHz e)
[ 18230.266] (II) AMDGPU(0): Modeline "1680x1050"x0.0 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync (65.3 kHz e)
[ 18230.266] (II) AMDGPU(0): Modeline "(null)"x59.9 118.25 1600 1696 1856 2112 900 903 908 934 -hsync +vsync (56.0 kHz e)
[ 18230.266] (II) AMDGPU(0): Modeline "1440x900"x0.0 106.50 1440 1520 1672 1904 900 903 909 934 -hsync +vsync (55.9 kHz e)
[ 18230.266] (II) AMDGPU(0): Modeline "1280x1024"x0.0 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[ 18230.266] (II) AMDGPU(0): Modeline "1280x800"x0.0 83.50 1280 1352 1480 1680 800 803 809 831 -hsync +vsync (49.7 kHz e)
以下是有关我的系统和设置的一些信息：
电视（Vestel，2015 年生产，品牌为“Telefunken”）通过 DisplayPort-to-HDMI 电缆连接到我的显卡（AMD Radeon RX 6700 XT），显卡又由驱动程序控制amdgpu。我在 Debian Sid 系统上使用 X11 和 i3wm。
mic@mic:~$ uname -a
Linux mic 6.5.0-3-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.5.8-1 (2023-10-22) x86_64 GNU/Linux
mic@mic:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux trixie/sid
Release: n/a
Codename: trixie
我检查了以下命令和位置是否有任何可能告诉我电视是否处于待机状态的指示：
mic@mic:~$ xrandr --verbose
Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 16384 x 16384
DisplayPort-0 connected primary (normal left inverted right x axis y axis)
Identifier: 0x54
Timestamp: 10692081
Subpixel: unknown
Clones:
CRTCs: 0 1 2 3 4 5
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
EDID:
00ffffffffffff0058b3003700000000
01190103805932780acf74a3574cb023
09484cafef80b3009500a94090408100
81808140010108e80030f2705a80b058
8a00501d7400001e023a801871382d40
582c4500501d7400001e000000fc0034
305548445f4c43445f54560a000000fd
00303e0f463c000a20202020202001d0
020344f15c0106070203151611121304
14051f902021225d5e5f606162636465
6629090707150750570600830100006e
030c001000f83c20008004030201e50f
0000600c011d803e73382d407e2c4580
00d05200001e011d80d0721c2d20102c
258000d05200009e0000000000000000
00000000000000000000000000000013
GAMMA_LUT_SIZE: 4096
range: (0, -1)
DEGAMMA_LUT_SIZE: 4096
range: (0, -1)
GAMMA_LUT: 0
range: (0, 65535)
CTM: 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0
0 1
DEGAMMA_LUT: 0
range: (0, 65535)
TearFree: auto
supported: off, on, auto
subconnector: HDMI
supported: Unknown, VGA, DVI-D, HDMI, DP, Wireless, Native
HDCP Content Type: HDCP Type0
supported: HDCP Type0, HDCP Type1
Content Protection: Undesired
supported: Undesired, Desired, Enabled
vrr_capable: 0
range: (0, 1)
Colorspace: Default
supported: Default, BT709_YCC, opRGB, BT2020_RGB, BT2020_YCC
max bpc: 16
range: (8, 16)
underscan vborder: 0
range: (0, 128)
underscan hborder: 0
range: (0, 128)
underscan: off
supported: off, on, auto
scaling mode: None
supported: None, Full, Center, Full aspect
link-status: Good
supported: Good, Bad
CONNECTOR_ID: 99
supported: 99
non-desktop: 0
range: (0, 1)
1920x1080 (0x59) 148.500MHz +HSync +VSync
h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.50KHz
v: height 1080 start 1084 end 1089 total 1125 clock 60.00Hz
1920x1080 (0x5a) 148.500MHz +HSync +VSync
h: width 1920 start 2448 end 2492 total 2640 skew 0 clock 56.25KHz
v: height 1080 start 1084 end 1089 total 1125 clock 50.00Hz
1920x1080 (0x5b) 148.352MHz +HSync +VSync
h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.43KHz
v: height 1080 start 1084 end 1089 total 1125 clock 59.94Hz
1920x1080 (0x5c) 74.250MHz +HSync +VSync
h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 33.75KHz
v: height 1080 start 1084 end 1089 total 1125 clock 30.00Hz
1920x1080 (0x5d) 74.250MHz +HSync +VSync
h: width 1920 start 2448 end 2492 total 2640 skew 0 clock 28.12KHz
v: height 1080 start 1084 end 1089 total 1125 clock 25.00Hz
1920x1080 (0x5e) 74.250MHz +HSync +VSync
h: width 1920 start 2558 end 2602 total 2750 skew 0 clock 27.00KHz
v: height 1080 start 1084 end 1089 total 1125 clock 24.00Hz
1920x1080 (0x5f) 74.176MHz +HSync +VSync
h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 33.72KHz
v: height 1080 start 1084 end 1089 total 1125 clock 29.97Hz
1920x1080 (0x60) 74.176MHz +HSync +VSync
h: width 1920 start 2558 end 2602 total 2750 skew 0 clock 26.97KHz
v: height 1080 start 1084 end 1089 total 1125 clock 23.98Hz
1600x1200 (0x61) 162.000MHz +HSync +VSync
h: width 1600 start 1664 end 1856 total 2160 skew 0 clock 75.00KHz
v: height 1200 start 1201 end 1204 total 1250 clock 60.00Hz
1680x1050 (0x62) 119.000MHz +HSync -VSync
h: width 1680 start 1728 end 1760 total 1840 skew 0 clock 64.67KHz
v: height 1050 start 1053 end 1059 total 1080 clock 59.88Hz
1400x1050 (0x63) 101.000MHz +HSync -VSync
h: width 1400 start 1448 end 1480 total 1560 skew 0 clock 64.74KHz
v: height 1050 start 1053 end 1057 total 1080 clock 59.95Hz
1280x1024 (0x64) 135.000MHz +HSync +VSync
h: width 1280 start 1296 end 1440 total 1688 skew 0 clock 79.98KHz
v: height 1024 start 1025 end 1028 total 1066 clock 75.02Hz
1280x1024 (0x65) 108.000MHz +HSync +VSync
h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 63.98KHz
v: height 1024 start 1025 end 1028 total 1066 clock 60.02Hz
1440x900 (0x66) 88.750MHz +HSync -VSync
h: width 1440 start 1488 end 1520 total 1600 skew 0 clock 55.47KHz
v: height 900 start 903 end 909 total 926 clock 59.90Hz
1280x960 (0x67) 108.000MHz +HSync +VSync
h: width 1280 start 1376 end 1488 total 1800 skew 0 clock 60.00KHz
v: height 960 start 961 end 964 total 1000 clock 60.00Hz
1280x800 (0x68) 71.000MHz +HSync -VSync
h: width 1280 start 1328 end 1360 total 1440 skew 0 clock 49.31KHz
v: height 800 start 803 end 809 total 823 clock 59.91Hz
1152x864 (0x69) 108.000MHz +HSync +VSync
h: width 1152 start 1216 end 1344 total 1600 skew 0 clock 67.50KHz
v: height 864 start 865 end 868 total 900 clock 75.00Hz
1280x720 (0x6a) 74.250MHz +HSync +VSync
h: width 1280 start 1390 end 1430 total 1650 skew 0 clock 45.00KHz
v: height 720 start 725 end 730 total 750 clock 60.00Hz
1280x720 (0x6b) 74.250MHz +HSync +VSync
h: width 1280 start 1720 end 1760 total 1980 skew 0 clock 37.50KHz
v: height 720 start 725 end 730 total 750 clock 50.00Hz
1280x720 (0x6c) 74.176MHz +HSync +VSync
h: width 1280 start 1390 end 1430 total 1650 skew 0 clock 44.96KHz
v: height 720 start 725 end 730 total 750 clock 59.94Hz
1024x768 (0x6d) 78.750MHz +HSync +VSync
h: width 1024 start 1040 end 1136 total 1312 skew 0 clock 60.02KHz
v: height 768 start 769 end 772 total 800 clock 75.03Hz
1024x768 (0x6e) 75.000MHz -HSync -VSync
h: width 1024 start 1048 end 1184 total 1328 skew 0 clock 56.48KHz
v: height 768 start 771 end 777 total 806 clock 70.07Hz
1024x768 (0x6f) 65.000MHz -HSync -VSync
h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.36KHz
v: height 768 start 771 end 777 total 806 clock 60.00Hz
832x624 (0x70) 57.284MHz -HSync -VSync
h: width 832 start 864 end 928 total 1152 skew 0 clock 49.73KHz
v: height 624 start 625 end 628 total 667 clock 74.55Hz
800x600 (0x71) 50.000MHz +HSync +VSync
h: width 800 start 856 end 976 total 1040 skew 0 clock 48.08KHz
v: height 600 start 637 end 643 total 666 clock 72.19Hz
800x600 (0x72) 49.500MHz +HSync +VSync
h: width 800 start 816 end 896 total 1056 skew 0 clock 46.88KHz
v: height 600 start 601 end 604 total 625 clock 75.00Hz
800x600 (0x73) 40.000MHz +HSync +VSync
h: width 800 start 840 end 968 total 1056 skew 0 clock 37.88KHz
v: height 600 start 601 end 605 total 628 clock 60.32Hz
800x600 (0x74) 36.000MHz +HSync +VSync
h: width 800 start 824 end 896 total 1024 skew 0 clock 35.16KHz
v: height 600 start 601 end 603 total 625 clock 56.25Hz
720x576 (0x75) 27.000MHz -HSync -VSync
h: width 720 start 732 end 796 total 864 skew 0 clock 31.25KHz
v: height 576 start 581 end 586 total 625 clock 50.00Hz
720x480 (0x76) 27.027MHz -HSync -VSync
h: width 720 start 736 end 798 total 858 skew 0 clock 31.50KHz
v: height 480 start 489 end 495 total 525 clock 60.00Hz
720x480 (0x77) 27.000MHz -HSync -VSync
h: width 720 start 736 end 798 total 858 skew 0 clock 31.47KHz
v: height 480 start 489 end 495 total 525 clock 59.94Hz
640x480 (0x78) 31.500MHz -HSync -VSync
h: width 640 start 656 end 720 total 840 skew 0 clock 37.50KHz
v: height 480 start 481 end 484 total 500 clock 75.00Hz
640x480 (0x79) 31.500MHz -HSync -VSync
h: width 640 start 664 end 704 total 832 skew 0 clock 37.86KHz
v: height 480 start 489 end 492 total 520 clock 72.81Hz
640x480 (0x7a) 25.200MHz -HSync -VSync
h: width 640 start 656 end 752 total 800 skew 0 clock 31.50KHz
v: height 480 start 490 end 492 total 525 clock 60.00Hz
640x480 (0x7b) 25.175MHz -HSync -VSync
h: width 640 start 656 end 752 total 800 skew 0 clock 31.47KHz
v: height 480 start 490 end 492 total 525 clock 59.94Hz
720x400 (0x7c) 28.320MHz -HSync +VSync
h: width 720 start 738 end 846 total 900 skew 0 clock 31.47KHz
v: height 400 start 412 end 414 total 449 clock 70.08Hz
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
Identifier: 0x55
Timestamp: 10692081
Subpixel: unknown
Clones:
CRTCs: 0 1 2 3 4 5
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
GAMMA_LUT_SIZE: 4096
range: (0, -1)
DEGAMMA_LUT_SIZE: 4096
range: (0, -1)
GAMMA_LUT: 0
range: (0, 65535)
CTM: 0
DEGAMMA_LUT: 0
range: (0, 65535)
TearFree: auto
supported: off, on, auto
subconnector: Unknown
supported: Unknown, VGA, DVI-D, HDMI, DP, Wireless, Native
HDCP Content Type: HDCP Type0
supported: HDCP Type0, HDCP Type1
Content Protection: Undesired
supported: Undesired, Desired, Enabled
vrr_capable: 0
range: (0, 1)
Colorspace: Default
supported: Default, BT709_YCC, opRGB, BT2020_RGB, BT2020_YCC
max bpc: 16
range: (8, 16)
underscan vborder: 0
range: (0, 128)
underscan hborder: 0
range: (0, 128)
underscan: off
supported: off, on, auto
scaling mode: None
supported: None, Full, Center, Full aspect
link-status: Good
supported: Good, Bad
CONNECTOR_ID: 108
supported: 108
non-desktop: 0
range: (0, 1)
mic@mic:~$ ddcutil detect
Invalid display
I2C bus: /dev/i2c-4
DRM connector: card0-DP-1
EDID synopsis:
Mfg id: VES - Vestel Elektronik Sanayi ve Ticaret A. S.
Model: 40UHD_LCD_TV
Product code: 14080 (0x3700)
Serial number:
Binary serial number: 0 (0x00000000)
Manufacture year: 2015, Week: 1
DDC communication failed
mic@mic:/sys/class/drm/card0-DP-1$ cat connector_id dpms enabled modes status uevent
99
Off
disabled
1920x1080
1920x1080
1920x1080
1920x1080
1920x1080
1920x1080
1920x1080
1920x1080
1920x1080
1920x1080
1600x1200
1680x1050
1400x1050
1280x1024
1280x1024
1440x900
1280x960
1280x800
1152x864
1280x720
1280x720
1280x720
1024x768
1024x768
1024x768
832x624
800x600
800x600
800x600
800x600
720x576
720x576
720x480
720x480
720x480
720x480
640x480
640x480
640x480
640x480
640x480
720x400
connected
DEVTYPE=drm_connector
mic@mic:/sys/class/drm/card0-DP-1$ xxd -g1 edid
00000000: 00 ff ff ff ff ff ff 00 58 b3 00 37 00 00 00 00 ........X..7....
00000010: 01 19 01 03 80 59 32 78 0a cf 74 a3 57 4c b0 23 .....Y2x..t.WL.#
00000020: 09 48 4c af ef 80 b3 00 95 00 a9 40 90 40 81 00 .HL........@.@..
00000030: 81 80 81 40 01 01 08 e8 00 30 f2 70 5a 80 b0 58 [email protected]
00000040: 8a 00 50 1d 74 00 00 1e 02 3a 80 18 71 38 2d 40 ..P.t....:..q8-@
00000050: 58 2c 45 00 50 1d 74 00 00 1e 00 00 00 fc 00 34 X,E.P.t........4
00000060: 30 55 48 44 5f 4c 43 44 5f 54 56 0a 00 00 00 fd 0UHD_LCD_TV.....
00000070: 00 30 3e 0f 46 3c 00 0a 20 20 20 20 20 20 01 d0 .0>.F<.. ..
00000080: 02 03 44 f1 5c 01 06 07 02 03 15 16 11 12 13 04 ..D.\...........
00000090: 14 05 1f 90 20 21 22 5d 5e 5f 60 61 62 63 64 65 .... !"]^_`abcde
000000a0: 66 29 09 07 07 15 07 50 57 06 00 83 01 00 00 6e f).....PW......n
000000b0: 03 0c 00 10 00 f8 3c 20 00 80 04 03 02 01 e5 0f ......< ........
000000c0: 00 00 60 0c 01 1d 80 3e 73 38 2d 40 7e 2c 45 80 ..`....>s8-@~,E.
000000d0: 00 d0 52 00 00 1e 01 1d 80 d0 72 1c 2d 20 10 2c ..R.......r.- .,
000000e0: 25 80 00 d0 52 00 00 9e 00 00 00 00 00 00 00 00 %...R...........
000000f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 13 ................
但这些文件都没有显示出任何变化。 Xorg 日志或 udevadm 事件也没有包含任何有关电视是否打开或关闭的指示。
答案1
在研究这个问题的过程中，我跑了
ddcutil interrogate
它承诺“收集最多的信息”。
事实上，在一分钟内它打印了 5000 多行信息。
计算差异做过产生一个单一的重要信息：
Probing bus /dev/i2c-4 using command "i2cdetect -y 4"
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
+ 30: -- -- -- -- -- -- -- -- -- -- 3a -- -- -- -- --
40: 40 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: 50 51 -- -- 54 -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
事实上，对于我的电视来说，i2cdetect -y 4 0x3a 0x3a可以可靠地报告待机状态。
和python3-smbus，
import smbus
smbus.SMBus(4).read_byte(0x3a)
如果电视处于待机状态，则会升高OSError；如果电视处于打开状态，则会成功返回。
CONNECTOR_IDI2C/SM 总线编号可以通过 报告的字段确定xrandr --verbose。可以在 中找到相同的连接器 ID /sys/class/drm/*/connector_id。在匹配的子文件夹中，readlink ddc将产生总线编号。
不幸的是，虽然这个解决方案对我来说足够好，但它似乎只适用于这台特定的电视。我的另一台显示器不响应其 I2C 总线上的任何地址，即使它已打开。