Quick & dirty tool to generate fb.modes file from xorg detected valid modes. Just a way to avoid boring myself to death by manually generating modelines to convert them later to fb.modes with modeline2fb.

xorg-log-extract-modelines.pl

#!/usr/bin/perl
#
# Quick & dirty tool to generate fb.modes file from xorg detected valid modes.
# Just a way to avoid boring myself to death by manually generating modelines 
# to convert them later to fb.modes with modeline2fb
#
# First we generate a X logfile with detailed info and later convert it.
#
# Usage:
# X :1 -logverbose 6
# cat /var/log/Xorg.1.log | ./xorg-log-extract-modelines.pl | modeline2fb -d 16 | sudo tee /etc/fb.modes

# Sample blocks from the log:
#
# A valid mode
#
#[ 26984.986] (II) NVIDIA(GPU-0):   Validating Mode "1680x1050":
#[ 26984.986] (II) NVIDIA(GPU-0):     1680 x 1050 @ 60 Hz
#[ 26984.986] (II) NVIDIA(GPU-0):     Mode Source: EDID
#[ 26984.986] (II) NVIDIA(GPU-0):       Pixel Clock      : 146.25 MHz
#[ 26984.986] (II) NVIDIA(GPU-0):       HRes, HSyncStart : 1680, 1784
#[ 26984.986] (II) NVIDIA(GPU-0):       HSyncEnd, HTotal : 1960, 2240
#[ 26984.986] (II) NVIDIA(GPU-0):       VRes, VSyncStart : 1050, 1053
#[ 26984.986] (II) NVIDIA(GPU-0):       VSyncEnd, VTotal : 1059, 1089
#[ 26984.986] (II) NVIDIA(GPU-0):       H/V Polarity     : -/+
#[ 26984.987] (II) NVIDIA(GPU-0):     Viewport                 1680x1050+0+0
#[ 26984.987] (II) NVIDIA(GPU-0):       Horizontal Taps        0
#[ 26984.987] (II) NVIDIA(GPU-0):       Vertical Taps          0
#[ 26984.987] (II) NVIDIA(GPU-0):       Base SuperSample       x4
#[ 26984.987] (II) NVIDIA(GPU-0):       Base Depth             32
#[ 26984.987] (II) NVIDIA(GPU-0):       Distributed Rendering  1
#[ 26984.987] (II) NVIDIA(GPU-0):       Overlay Depth          32
#[ 26984.987] (II) NVIDIA(GPU-0):     Mode is valid.
#
# An invalid mode
#
#[ 26985.015] (II) NVIDIA(GPU-0):   Validating Mode "1680x1050":
#[ 26985.015] (II) NVIDIA(GPU-0):     1680 x 1050 @ 60 Hz
#[ 26985.015] (II) NVIDIA(GPU-0):     Mode Source: X Configuration file ModeLine
#[ 26985.015] (II) NVIDIA(GPU-0):       Pixel Clock      : 119.00 MHz
#[ 26985.015] (II) NVIDIA(GPU-0):       HRes, HSyncStart : 1680, 1728
#[ 26985.015] (II) NVIDIA(GPU-0):       HSyncEnd, HTotal : 1760, 1840
#[ 26985.015] (II) NVIDIA(GPU-0):       VRes, VSyncStart : 1050, 1053
#[ 26985.015] (II) NVIDIA(GPU-0):       VSyncEnd, VTotal : 1059, 1080
#[ 26985.015] (II) NVIDIA(GPU-0):       H/V Polarity     : +/+
#[ 26985.015] (WW) NVIDIA(GPU-0):     Mode is rejected: Only EDID-provided modes are allowed on
#[ 26985.015] (WW) NVIDIA(GPU-0):     Maxdata/Belinea o.disp2.1_22W (DFP-0) (continuous
#[ 26985.015] (WW) NVIDIA(GPU-0):     frequency modes not allowed).

use strict;

my $text;

my $modeline = qr/
	Validating\ Mode\ "(?<mode>[^"]+)"
	[^@]+@\ (?<refresh>[0-9]+)\ Hz
	[^0-9]+(?<clock>[0-9\.]+)\ MHz
	[^0-9]+(?<hres>[0-9]+),\ +(?<hsyncstart>[0-9]+)
	[^0-9]+(?<hsyncend>[0-9]+),\ +(?<htotal>[0-9]+)
	[^0-9]+(?<vres>[0-9]+),\ +(?<vsyncstart>[0-9]+)
	[^0-9]+(?<vsyncend>[0-9]+),\ +(?<vtotal>[0-9]+)
	[^:]+\:\ (?<hpolarity>[+-])\/(?<vpolarity>[+-])
	(.*?)Mode.*?is\ (?<result>\w+)  # Too risky to do [^M]+
	/xs;

#	(.*?)Mode\ is\ (?<result>\w+) # Lazy dot
#	[^M]+Mode\ is\ (?<result>\w+) # Negated "M"

while (<STDIN>) {
	$text .= $_; # Eat everything, we need whole blocks for the regexp
}

$text =~ s/^[^:]+://mg; # Dump the beginning of each line of the log
#print $text;

while ($text =~ m/$modeline/g){
	print "ModeLine \"$+{mode}_$+{refresh}\" $+{clock} $+{hres} $+{hsyncstart} $+{hsyncend} $+{htotal} $+{vres} $+{vsyncstart} $+{vsyncend} $+{vtotal} $+{hpolarity}HSync $+{vpolarity}VSync\n" if ($+{result} eq "valid");
}