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kern/49592: EDID doesn't working in Xorg on HD2500 in 7.0_BETA and -current (amd64)

>Number:         49592
>Category:       kern
>Synopsis:       EDID doesn't working in Xorg on HD2500 in 7.0_BETA and -current (amd64)
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jan 20 21:15:00 +0000 2015
>Originator:     Piotr Meyer
>Release:        7.0_BETA
amd64, G2030 (Ivy Bridge) CPU with HD2500 graphics (integrated)

Regression: EDID reads had stopped after import DRM from linux kernel 3.15. I think it is a kernel regression because same userland can read EDID data with older kernel (see below).

Now, starting X session ends in blank screen. Creating mode manually (via xrandr) gave me working system - but nowadays users are used to automatic mode configuration.

Unfortunately, DRM in debug mode create more logs than buffer size and I lost some data.

kernel log before 'startx' command:
kernel log after 'startx' command:
Xorg log:

for comparision similar logs from older kernel:

I tried all three ports (DVI, HDMI and D-SUB) without success.

Point in time, when new code was commited:


A workaround (mode definition should be taken from current system):

$ cat .xinitrc
xrandr --newmode 1920x1080 148.50  1920 2008 2052 2200  1080 1084 1089 1125 +hsync +vsync
xrandr --addmode HDMI1 1920x1080
xrandr --output HDMI1 --mode 1920x1080

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