[SOLVED] After Update 9.0.5 to 9.0.6 my 7'' LCD not working correctly

[Jedrek]

I have a error on my current installation:

Code:

pi@moode:~ $ kmsprint -m
terminate called after throwing an instance of 'std::runtime_error'
 what():  failed to find DRM cards
Aborted
pi@moode:~ $ kmsprint
terminate called after throwing an instance of 'std::runtime_error'
 what():  failed to find DRM cards
Aborted
pi@moode:~ $

New fresh installation without extra changes, by default setting with enabling LCD. I have no signal.
Integated audio = Kernel mode (default)
Only all information is displayed while the system is booting and then nothing is displayed. No signal.

Code:

pi@moode:~ $ kmsprint
Connector 0 (32) HDMI-A-1 (disconnected)
  Encoder 0 (31) TMDS
Connector 1 (41) HDMI-A-2 (disconnected)
  Encoder 1 (40) TMDS

I searched the problem and found the solution: https://github.com/raspberrypi/linux/issues/5178

Solution.
Step 1
In the moode generated during installation, clean the config.txt file and add the phrase at the end:

Code:

hdmi_edid_file=1

Step 2
In the cmdline.txt file, I add the following phrase at the very end as a continuation of the command line:

Code:

drm.edid_firmware=edid.dat video=HDMI-A-1:1920x1080@60D

Now everything works.

Code:

pi@moode:~ $ kmsprint
Connector 0 (32) HDMI-A-1 (connected)
  Encoder 0 (31) TMDS
    Crtc 3 (94) 1600x900@60.00 108.000 1600/24/80/96/+ 900/1/3/96/+ 60 (60.00)
      Plane 3 (84) fb-id: 340 (crtcs: 3) 0,0 1600x900 -> 0,0 1600x900 (XR24 AR24 AB24 XB24 RG16 BG16 AR15 XR15 RG24 BG24 YU16 YV16 YU24 YV24 YU12 YV12 NV12 NV21 NV16 NV61 P030 XR30 AR30 AB30 XB30 RGB8 BGR8 XR12 AR12 XB12 AB12 BX12 BA12 RX12 RA12)
        FB 340 1600x900 XR24
      Plane 25 (307) fb-id: 339 (crtcs: 3) 0,0 64x64 -> 803,409 64x64 (XR24 AR24 AB24 XB24 RG16 BG16 AR15 XR15 RG24 BG24 YU16 YV16 YU24 YV24 YU12 YV12 NV12 NV21 NV16 NV61 P030 XR30 AR30 AB30 XB30 RGB8 BGR8 XR12 AR12 XB12 AB12 BX12 BA12 RX12 RA12)
        FB 339 64x64 AR24
Connector 1 (41) HDMI-A-2 (disconnected)
  Encoder 1 (40) TMDS