There are several tools to read the Extended Display Identification Data, EDID, from systems but I found LinuxTV’s edid-decode the most thorough when debugging for a linux 5.0.x display boot flicking problem.

On arch I ran installed edid-decode-git and then ran a quick script:

for f in `find /sys/devices -name 'edid'`; do sudo cat $f| edid-decode;done

and I got something like:

EDID version: 1.4
Manufacturer: BOE Model 65a Serial Number 0
Made in week 1 of 2015
Digital display
6 bits per primary color channel
DisplayPort interface
Maximum image size: 34 cm x 19 cm
Gamma: 2.20
Supported color formats: RGB 4:4:4, YCrCb 4:4:4
First detailed timing includes the native pixel format and preferred refresh rate
Display x,y Chromaticity:
  Red:   0.6416, 0.3437
  Green: 0.3183, 0.6103
  Blue:  0.1494, 0.0439
  White: 0.3125, 0.3281
Established timings supported:
Standard timings supported:
Detailed mode: Clock 139.770 MHz, 344 mm x 194 mm
               1920 1968 2000 2080 hborder 0
               1080 1083 1089 1120 vborder 0
               +hsync -vsync 
               VertFreq: 59 Hz, HorFreq: 67197 Hz
Detailed mode: Clock 111.820 MHz, 344 mm x 194 mm
               1920 1968 2000 2080 hborder 0
               1080 1083 1089 1120 vborder 0
               +hsync -vsync 
               VertFreq: 47 Hz, HorFreq: 53759 Hz
ASCII string: J125V
Manufacturer-specified data, tag 0
Checksum: 0xa9 (valid)

This helped when trying to diagnose: black screen on Dell XPS 15 with kernel 5.0 and Bug 109959 – REGRESSION: black screen with linux 5.0 when starting X