Created attachment 113889 [details]
X server log file: `/var/log/Xorg.0.log`

With Debian Sid/unstable, GDM 3.14.1-3 [1] and the X server 1.16.4 [2], the
Xserver takes more than five seconds to start.

The board is the ASRock A780FullHD with the following integrated graphics
device.

    01:05.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
RS780 [Radeon HD 3200]

Looking at the log file of the X server, it seems like the monitor is several
times probed for its EDID, which takes each time over a second.

    [    17.061] (II) This device may have been added with another device file.
    [    18.247] (II) RADEON(0): EDID vendor "SAM", prod id 404

Do you know if this is an X server problem or Radeon driver related? Please
reassign if it is not a Radeon problem.

[1]
http://metadata.ftp-master.debian.org/changelogs//main/g/gdm3/gdm3_3.14.1-3_changelog
[2]
http://metadata.ftp-master.debian.org/changelogs//main/x/xorg-server/xorg-server_1.16.4-1_changelog