Acer AL1916W: running Xorg at 1440×900

I recently purchased an Acer AL1916W, a nice Widescreen TFT with an unusual resolution of 1440×900 px, which was at first a challenge to configure. I tried various setups in xorg.conf, en- and disabled DDC, even wrote my own modelines. The best I got was an 1440×900 resolution with black broders (~ 3 cm) on the left and right.

Until i read the manual (RTFM!), which I couldn’t find at the Acer Worldwide Homepage, so i provide it here: Acer AL1916W Handbook. At the end of the manual the reference signalmodes are listed:

Display Mode: WXGA 1440×900
Horizontal Frequency (kHz): 55.935
Vertical Frequency (Hz): 55.887
Pixel Frequency (MHz): 106.5
SYNC Polarity (H/V): -/+

At first i was puzzeld, because the refreshrate isn’t an integer (as I thought it should be). Nevertheless I used gtf, a small xorg-tool to calculate VESA Modlines, with this values:

~ # gtf 1440 900 55.887

# 1440x900 @ 55.89 Hz (GTF) hsync: 51.97 kHz; pclk: 98.96 MHz
Modeline "1440x900_55.89" 98.96 1440 1520 1672 1904 900 901 904 930 -HSync +Vsync

Using this ModeLine in xorg.conf, the Acer detects a 60 Hz refresh rate, and the auto-adjust works fine, the borders are gone.

3 thoughts on “Acer AL1916W: running Xorg at 1440×900”

  1. Dear Carlo,Thanks a lot for your rposense. I am using a server, no laptop. I used the word “default” before connected as the name and it work well. I could define the new mode. Now appear between the options of monitor preferences (at system/preferences/monitor) However when I try to use it, the message “the selected configuration for displays could not be applied, could not set the configuration for CRTC 262″. I can not fix the problem yet. I thanks in advance if you have other suggestion.P.

  2. Ok, this worked for me! here is my xorg.conf for fedora 19.

    Section “Monitor”
    Identifier “VGA-1”
    Modeline “1440x900_55.89” 98.96 1440 1520 1672 1904 900
    901 904 930 -HSync +Vsync
    Option “PreferredMode” “1440x900_60.00”

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