So my monitor stopped working,
when I was messing around with the the rotation
(ie xrander -o [ normal, left, right, inverted ] stuff).
(
The monitor input is DVI (DVI-D Dual Link),
and the laptop's output port is HDMI,
so they're connected with an adapter.
)
All (I think) of the relevant dmesg output:
[Tue Aug 22 03:18:45 2023] [drm:radeon_dvi_detect [radeon]] *ERROR* HDMI-A-1: probed a monitor but no|invalid EDID
[Tue Aug 22 03:18:45 2023] [drm:radeon_dvi_detect [radeon]] *ERROR* HDMI-A-1: probed a monitor but no|invalid EDID
[Tue Aug 22 03:18:45 2023] EDID has corrupt header
[Tue Aug 22 03:18:45 2023] [00] BAD ff ff ff ff ff ff 00 7f 2f 3d 07 47 4e 5f 7b 3f
[Tue Aug 22 03:18:45 2023] [00] BAD 17 01 03 ff 3f 1f 7f 3f ff 1f bf 7f 4f 9b 27 13
[Tue Aug 22 03:18:45 2023] [00] BAD 70 7c bf ee ff 71 4f 81 00 97 00 ff 0f 9d 0f 01
[Tue Aug 22 03:18:45 2023] [00] BAD 01 01 01 01 01 30 2a 40 c8 60 84 67 30 18 5f 13
[Tue Aug 22 03:18:45 2023] [00] BAD 00 bb f9 10 00 00 1e 00 00 00 fd 00 38 4f 1e 71
[Tue Aug 22 03:18:45 2023] [00] BAD 0f 00 0e 3f 20 20 3f 20 3f 00 00 00 fc 00 7f 7f
[Tue Aug 22 03:18:45 2023] [00] BAD 7f 33 3f 3f 3f 0e 3f 3f 3f 3f 20 00 00 00 ff 00
[Tue Aug 22 03:18:45 2023] [00] BAD 4f 77 4f 42 3f 3f 30 32 30 3f 0e 20 3f 01 b7 02
[Tue Aug 22 03:18:46 2023] EDID block 0 (tag 0x00) checksum is invalid, remainder is 190
[Tue Aug 22 03:18:46 2023] [drm:radeon_dvi_detect [radeon]] *ERROR* HDMI-A-1: probed a monitor but no|invalid EDID
[Tue Aug 22 03:18:46 2023] EDID has corrupt header
I did test it with a live-USB distro where the monitor was working before
(to make sure it wasn't just some messed up configuration in my kde plasma desktop environment or whatever),
but it doesn't work there either.
And after googling a bit,
it seems that apparently this is an actual known problem?
Like, the actual data in the EEPROM memory chip in a monitor itself can get corrupted while plugging the monitor in and out and stuff?
(Well, I'm personally pretty surprised and confused to learn that.)
But apparently that data,
the monitor just gives it to the computer,
so that the computer knows what different settings the monitor can do (in terms of resolution/refresh-rate/etc),
and then the computer uses it to decide what signal it sends to the monitor and how
-- but I'm not sure whether the monitor plays any further active role at that point,
or just "passively" displays whatever signal it receives from the computer...?
(
ie, I'm not sure
(assuming I can get a file with a non-corrupt EDID for the monitor)
whether:
(1) I would need to actually write that data back onto the chip in the monitor somehow(?)
(2) or if I could just tell the operating system like:
"I know the EDID data you're getting from the monitor is wrong, so use this file instead"
... ?
)
Also, I don't know how I can get a file with a non-corrupt EDID for the monitor?
Like, it's a "Samsung SyncMaster B2030",
and I was able to google up copies of EDID files for other monitors,
but not for this specific model...?
(I did find a .exe file for the Windows drivers (I think), so could I maybe extract the data from that somehow??)
