Comment 30 for bug 657509

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.