ubuntu-x-swat team mailing list archive

[Chris Halse Rogers <raof@xxxxxxxxxx>]

Your dmesg is full of
"""
[   28.781441] [drm:edid_is_valid] *ERROR* EDID checksum is invalid, remainder is 130
[   28.781446] [drm:edid_is_valid] *ERROR* Raw EDID:
[   28.781451] <3>00 ff ff ff ff ff ff 00 ff ff ff ff ff ff ff ff  ................
[   28.781454] <3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ................
[   28.781457] <3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ................
[   28.781460] <3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ................
[   28.781463] <3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ................
[   28.781466] <3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ................
[   28.781469] <3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ................
[   28.781471] <3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ................
"""

This indicates that the kernel module is getting a bad EDID from your
monitor, and the EDID is a table of information provided by the monitor
telling the driver what resolutions it supports.  This is likely to be
your problem.

However, you say this worked in Jaunty?  Could you please create the following /etc/X11/xorg.conf
"""
Section "Device"
    Identifier     "My display"
    Driver         "intel"
    Option        "ModeDebug" "true"
EndSection
"""
and reboot, adding “nomodeset” to the kernel command line?  This will disable the kernel's modesetting code and let the (older) modesetting code in the X driver try to set up your display.  If that gets the correct resolution on your monitor, could you please attach the /var/log/Xorg.0.log file while using nomodeset and the external monitor?  Thanks!

-- 
The right resolution for my screen is not detected
https://bugs.launchpad.net/bugs/567296
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