Comment # 10
on bug 105046
from Michael Zapf
It seems to be related to EDID, as I see it.
Once I turn off the display, I lose the EDID information.
Before:
# find /sys -name edid -exec echo {} \; -exec od -tx1 -Ax {} \;
/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-DVI-D-1/edid
000000
/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-DP-2/edid
000000
/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-HDMI-A-2/edid
000000 00 ff ff ff ff ff ff 00 41 2f 27 10 01 01 01 01
000010 00 19 01 03 80 36 23 78 ee ce 50 a3 54 4c 99 26
000020 0f 50 54 a5 6b 80 81 40 a9 00 a9 40 b3 00 d1 00
000030 01 01 01 01 01 01 28 3c 80 a0 70 b0 23 40 30 20
000040 36 00 22 60 21 00 00 1a 00 00 00 fc 00 56 53 58
000050 2d 33 33 30 0a 20 20 20 20 20 00 00 00 fd 00 30
000060 55 1e 46 11 00 0a 20 20 20 20 20 20 00 00 00 ff
000070 00 50 4c 43 39 33 33 30 31 34 47 0a 20 20 01 a6
000080 02 03 34 71 4b 01 02 04 85 06 10 11 13 14 15 1f
000090 38 09 7f 07 0f 7f 07 15 07 50 3e 06 c0 49 7f 00
0000a0 57 06 00 5f 7e 01 67 7e 00 83 4f 00 00 66 03 0c
0000b0 00 11 00 80 01 1d 80 18 71 1c 16 20 58 2c 25 00
0000c0 06 44 21 00 00 9e 01 1d 80 d0 72 1c 16 20 10 2c
0000d0 25 80 06 44 21 00 00 9e 01 1d 00 72 51 d0 1e 20
0000e0 6e 28 55 00 06 44 21 00 00 1e 01 1d 00 bc 52 d0
0000f0 1e 20 b8 28 55 40 06 44 21 00 00 1e 00 00 00 8f
000100
/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-DP-1/edid
000000
/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-HDMI-A-1/edid
000000
Turn off, turn on again:
# find /sys -name edid -exec echo {} \; -exec od -tx1 -Ax {} \;
/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-DVI-D-1/edid
000000
/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-DP-2/edid
000000
/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-HDMI-A-2/edid
000000
/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-DP-1/edid
000000
/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-HDMI-A-1/edid
000000
When I continue to turn it off and on again, EDID does not reappear. However,
when I reboot, it is there again. How does my monitor know that my PC has been
rebooted?
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