michal, you touched it last ... can you take a look

I assume this tool is too old to work correctly:

jb155sapqe02:~ # get-edid 
This is read-edid version 3.0.2. Prepare for some fun.
Attempting to use i2c interface                                                                                         
Looks like no busses have an EDID. Sorry!
Attempting to use the classical VBE interface
open /dev/mem: Operation not permitted
error initialising realmode interface
do you have full superuser (root) permissions?
I'm sorry nothing was successful. Maybe try some other arguments
if you played with them, or send an email to Matthew Kern <pyrophobicman@gmail.com>.

jb155sapqe02:~ # dmesg | grep -i secure
[    0.000000] secureboot: Secure boot enabled
[    0.000000] Kernel is locked down from EFI Secure Boot mode; see man kernel_lockdown.7
[    0.017138] secureboot: Secure boot enabled
[    2.348429] Loaded X.509 cert 'SUSE Linux Enterprise Secure Boot Signkey: a746b64b6cb71f13385638055f46162bac632acd'm_
[    2.404620] integrity: Loaded X.509 cert 'SUSE Linux Enterprise Secure Boot CA: ecab0d42c456cf770436b973993862965e87262f'
[    2.410829] Loaded X.509 cert 'SUSE Linux Enterprise Secure Boot Signkey: a746b64b6cb71f13385638055f46162bac632acd'

compiled edid-decode from GH:

ls -1 /sys/class/drm/card0/card0*/edid | xargs -I '{}' bash -c 'ls -l {}; cat {} | ./edid-decode - | head ; echo'
-r--r--r-- 1 root root 0 Jan 31 09:50 /sys/class/drm/card0/card0-Virtual-1/edid
EDID version: 1.4
Manufacturer: RHT Model 1234 Serial Number 0
Made in week 42 of 2014
Digital display
8 bits per primary color channel
DisplayPort interface
Maximum image size: 32 cm x 20 cm
Gamma: 2.20
Supported color formats: RGB 4:4:4
Default (sRGB) color space is primary color space



time to drop read-edid? :)

Works for me

# get-edid | parse-edid
This is read-edid version 3.0.2. Prepare for some fun.
Attempting to use i2c interface
No EDID on bus 0
No EDID on bus 1
No EDID on bus 2
No EDID on bus 3
No EDID on bus 4
No EDID on bus 5
No EDID on bus 6
No EDID on bus 7
No EDID on bus 8
No EDID on bus 11
No EDID on bus 12
No EDID on bus 13
Problem requesting slave address: Device or resource busy
No EDID on bus 15
Problem requesting slave address: Device or resource busy
No EDID on bus 17
2 potential busses found: 9 10
Will scan through until the first EDID is found.
Pass a bus number as an option to this program to go only for that one.
256-byte EDID successfully retrieved from i2c bus 9
Looks like i2c was successful. Have a good day.
Checksum Correct

Section "Monitor"
	Identifier ""
	ModelName ""
	VendorName "BOE"
	# Monitor Manufactured week 23 of 2019
	# EDID version 1.4
	# Digital Display
	DisplaySize 280 190
	Gamma 2.20
	Option "DPMS" "false"
	Modeline 	"Mode 0" +hsync -vsync 
	Modeline 	"Mode 1" +hsync -vsync 
EndSection

The crash was from a system without any monitor attached, as written in comment #0.

I suppose the problem would be that the system is not locked down, it reads something from /dev/mem, and fails parsing it.

Also it needs the i2c-dev module loaded to do anything useful but does not check for it being loaded - patches welcome :)

So it tries to run the x86 emulator on something that it assumes will give the VBE data, and it segfaults instead. Hard to debug without having that particular BIOS, and not really something I want to support. If it works for you, great. If not there is an option to disable the classic VBE BIOS reads. Maybe it could be the default to prevent executing random garbage.

#0  0x00007f1dd877116f in LRMI_init () at thunk.c:172
172		*((char *)0) = 0x4f; /* Make sure that we end up jumping back to a
(gdb) bt full
#0  0x00007f1dd877116f in LRMI_init () at thunk.c:172
        i = <optimized out>
        intFuncs = {0x7f1dd8770fd0 <x86emu_do_int> <repeats 256 times>}
        pioFuncs = {inb = 0x7f1dd8770e50 <x_inb>, inw = 0x7f1dd8770e60 <x_inw>, inl = 0x7f1dd8770e70 <x_inl>, outb = 0x7f1dd8770e80 <x_outb>, outw = 0x7f1dd8770e90 <x_outw>, outl = 0x7f1dd8770ea0 <x_outl>}
#1  0x000055ea99e99691 in classicmain (contr=0, qit=<optimized out>) at /usr/src/debug/read-edid-3.0.2-bp155.3.9.x86_64/get-edid/classic.c:131
        controller = 0
        error = <optimized out>
        output = <optimized out>
#2  0x000055ea99e9860b in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/read-edid-3.0.2-bp155.3.9.x86_64/get-edid/get-edid.c:132
        i = <optimized out>

Probably the real bug is in libx86 or whatever it's called. If it wants to do

*((char *)0) = 0x4f; 

it needs to ensure that the first page is mapped.

Sorry, I have touched libx86 last in 2008 when I was still at SUSE ;-)
I just learned that I am still officially its maintainer.

I'll request it being dropped from Factory if nobody else can take over now.

Droprequest: https://build.opensuse.org/request/show/1143135