should detect LCD screens and enable sub-pixel anti-aliasing

[Scott James Remnant (Canonical)]

subject says it all really, we should detect whether the machine has an LCD
screen as the default and if so enable sub-pixel anti-aliasing as the default

[Scott James Remnant (Canonical) (canonical-scott)]

This isn't just the case for fontconfig (which is what asks this question, I
think) but the GNOME Font dialog should probably pick this up as well

[Fabio Massimo Di Nitto (fabbione)]

Do you have an LCD screen where to check the read-edid output and see if it
detects that it is such kind of monitor. It fails on my 2 laptops so i can't
verify it myself.

Also i did a check on my systems and it can detect the monitor only on some of
them and sometimes not reliably. Do we anything better laying around debian?

[Matt Zimmerman (mdz)]

LCD autodetection would provide a default answer to the X server question about
whether the display is an LCD

[Clint Adams (wartzilla)]

here's parse-edid output from a B&W G3 Mac hooked up to an LCD display:

% parse-edid /proc/device-tree/pci@80000000/ATY,Rage128y@10/EDID
parse-edid: parse-edid version 1.4.1
parse-edid: EDID checksum passed.

        # EDID version 1 revision 2
Section "Monitor"
        # Block type: 2:0 3:fd
        # Block type: 2:0 3:fc
        Identifier "NEC LCD1810X"
        VendorName "NEC"
        ModelName "NEC LCD1810X"
        # Block type: 2:0 3:fd
        HorizSync 31-82
        VertRefresh 56-85
        # Max dot clock (video bandwidth) 170 MHz
        # Block type: 2:0 3:fc
        # Block type: 2:0 3:ff
        # DPMS capabilities: Active off:yes Suspend:yes Standby:yes

        Mode "1280x1024" # vfreq 60.020Hz, hfreq 63.981kHz
                DotClock 108.000000
                HTimings 1280 1328 1440 1688
                VTimings 1024 1025 1028 1066
                Flags "+HSync" "+VSync"
        EndMode
        # Block type: 2:0 3:fd
        # Block type: 2:0 3:fc
        # Block type: 2:0 3:ff
EndSection

[Fabio Massimo Di Nitto (fabbione)]

As you can see from the output there is no LCD flag other than in the
Model/Vendor name. This might not be true for all LCD monitors. Also X doesn't
ask about LCD anymore since the use of it is to hide a selection in a question.
This is now a fontconfig problem.

[Fabio Massimo Di Nitto (fabbione)]

Fixed with fontconfig_2.2.2-2ubuntu1 upload.