Intel G45 ModeLines

Terry Barnaby terry1 at
Sat Dec 6 23:38:12 PST 2008

Eric Anholt wrote:
> On Sun, 2008-12-07 at 06:48 +0000, Terry Barnaby wrote:
>> Hi,
>> I am playing with an Intel G45FC Motherboard with a HDMI connected Samsung HDTV.
>> I am using Fedora 10 as the base with the latest DRM/X11 driver from the
>> Xorg GIT repository. In general this appears to be working.
>> However, the TV's EDID is not correct in some details and so I wish to override
>> some things in the "Monitor section of the xorg.conf file. However they do not 
>> seem to work.
>> If I add: "DisplaySize	890 500" this is ignored.
>> If I add: "ModeLine "1920x1080_50" 148.50 1920 2448 2492 2640 1080 1084 1089 
>> 1125 +HSync +VSync" with a "Modes "1920x1080_50" " line in the "Screen" section
>> this seems to be ignored.
>> Is there any way to get the Intel driver to use a user provided ModeLine ?
> xorg.conf(5):
>        Option "PreferredMode"  "string"
>               This optional entry specifies a mode to be marked as the preferred ini‐
>               tial mode of the monitor.  (RandR 1.2-supporting drivers only)
> However the real preferred thing to do is write up a quirk for the
> server to fix your EDID so that other people get the benefit of your
> bugfixes.
Thanks for the reply.
Setting the "PreferredMode" option had no effect.

However, with some more research I found that I needed to add the line:
Option "monitor-HDMI-1" "Monitor0" to my "Device" section. The Intel
driver was assuming my default "Monitor" section referred to the VGA
output rather than the HDMI-1 output although no VGA monitor was
connected. Having done this my settings in the "Monitor" section
are no longer ignored.
I don't know if this is a feature or a bug ...



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