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[Chaostya <chaostya@xxxxxxx>]

Found the exact scenario to reproduce my problem:

When it works:
1. We have a laptop completely turned off. First we plug-in external monitor and then we turn it on.
2. Boot and try to get EDID - it works.
How to make it fail:
3. Suspend my laptop. And unplug external monitor.
4. Wake it up. Adjust laptop screen resolution via System->Preferences->Display.
5. Suspend it again. Plug external monitor.
6. Wake it up. Try to get EDID - failure, it doesn't reads CRT edid anymore (but still reads LVDS edid).

root@my-laptop:/home/me# i2cdetect "intel drm CRTDDC_A"
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will probe file /dev/i2c-0.
I will probe address range 0x03-0x77.
Continue? [Y/n] 
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --                        

root@my-laptop:/home/me# i2cdetect "intel drm LVDSDDC_C"
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will probe file /dev/i2c-1.
I will probe address range 0x03-0x77.
Continue? [Y/n]  
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: 30 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: 50 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --

-- 
[i915gm] Karmic Koala, i915, Unknown monitor (fails to get EDID)
https://bugs.launchpad.net/bugs/422406
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