на винде всё норм было
Это ничего не значит. Windows про EDID ничего не знала до недавнего времени. Может, и сейчас ещё не умеет. Там другой способ выбора разрешений, такой, который в xorg был лет 7-8 назад. Что в /var/log/Xorg.0.log про EDID написано ?
Там много чего написано, сюда не влазит. Вот начало [ 29.451]
X.Org X Server 1.14.7
Release Date: 2014-06-05
[ 29.456] X Protocol Version 11, Revision 0
[ 29.456] Build Operating System: ALT Linux p7 (Trientalis) i686
[ 29.456] Current Operating System: Linux host-18.localdomain 3.14.41-std-def-alt1 #1 SMP Thu May 7 12:49:34 UTC 2015 i686
[ 29.456] Kernel command line: BOOT_IMAGE=/boot/vmlinuz root=UUID=25429da3-087f-4260-9c86-30e2a1aa5d7f ro quiet=1 resume=/dev/disk/by-uuid/82743d6c-d649-45a0-84e7-481f047dfee9 panic=30 splash
[ 29.457] Build Date: 20 November 2015 06:17:37PM
[ 29.457]
[ 29.457] Current version of pixman: 0.28.2
[ 29.457] Before reporting problems, check
http://wiki.x.org to make sure that you have the latest version.
[ 29.457] Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 29.463] (==) Log file: "/var/log/Xorg.0.log", Time: Tue Jan 19 20:21:48 2016
[ 29.492] (==) Using config directory: "/etc/X11/xorg.conf.d"
[ 29.492] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[ 29.493] (==) No Layout section. Using the first Screen section.
[ 29.493] (==) No screen section available. Using defaults.
[ 29.493] (**) |-->Screen "Default Screen Section" (0)
[ 29.493] (**) | |-->Monitor "<default monitor>"
[ 29.494] (==) No monitor specified for screen "Default Scree