[Bug 657509] Re: DRM: Invalid EDID Checksum - External Monitor DVI -D not recognized by Kernel / Intel Graphisc Driver

[Corné Verbruggen]

Hi,

I seem to have the same (or related) problem with a Dell Latitude e6410
(core i5 M560) using its DisplayPort (through a DisplayPort to Dual-link
DVI adapter) to connect a LG-W3000H at 2560x1600. I get these messages:

[   47.741112] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 99
[   47.741114] [drm:drm_edid_block_valid] *ERROR* Raw EDID:
[   47.741115] <3>4c 4c 4c ff ff ff ff ff 4c 4c 4c ff ff ff ff ff  LLL.....LLL.....
[   47.741117] <3>4a 4a 4a ff ff ff ff ff 4a 4a 4a ff ff ff ff ff  JJJ.....JJJ.....
[   47.741118] <3>4a 4a 4a ff ff ff ff ff 4a 4a 4a ff ff ff ff ff  JJJ.....JJJ.....
[   47.741119] <3>4a 4a 4a ff ff ff ff ff 4a 4a 4a ff ff ff ff ff  JJJ.....JJJ.....
[   47.741120] <3>49 49 49 ff ff ff ff ff 49 49 49 ff ff ff ff ff  III.....III.....
[   47.741121] <3>48 48 48 ff ff ff ff ff 47 47 47 ff ff ff ff ff  HHH.....GGG.....
[   47.741123] <3>47 47 47 ff ff ff ff ff 47 47 47 ff ff ff ff ff  GGG.....GGG.....
[   47.741124] <3>47 47 47 ff ff ff ff ff 47 47 47 ff ff ff ff ff  GGG.....GGG.....
[   47.741125] 

I followed the advise above to install upstream kernels. I tried two
(cause I was not sure which one would be the best):

linux-
image-2.6.36-020636rc8-generic_2.6.36-020636rc8.201010150908_amd64.deb:
both laptop and external screen completely blank. The system did boot it
seemed, based on harddisk activity i hear.

linux-image-2.6.36-997-generic_2.6.36-997.201010090908_amd64.deb: latop
booted, initially some screen flickering, but then progressed normally.
But the problem of the external display is not solved.

This is my xrandr output:

Screen 0: minimum 320 x 200, current 1440 x 900, maximum 8192 x 8192
VGA1 disconnected (normal left inverted right x axis y axis)
DP1 connected 1440x900+0+0 (normal left inverted right x axis y axis) 303mm x 189mm
   1440x900       60.0*+   40.0  
HDMI1 disconnected (normal left inverted right x axis y axis)
DP2 connected 1360x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1360x768       59.8* 
   1024x768       60.0  
   800x600        60.3     56.2  
   848x480        60.0  
   640x480        59.9     59.9  
HDMI2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)

If any other info can help, or when i can test another kernel, please
let me know.

-- 
DRM: Invalid EDID Checksum - External Monitor DVI -D not recognized by Kernel / Intel Graphisc Driver
https://bugs.launchpad.net/bugs/657509
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