Screen-session.d scripts specific to Ubuntu (or not ?)

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Hi,

For LTSP in Ubuntu I added the 3 attached screen-session.d scripts to
fix several hardware issues/misdetections I've been reported.

XS20-xserver-ati-3drage-hack
 - Fixes visual corruption on old ATI rage, without that fix X shows
visual artefacts (white squares) when clicking on menus for example.

XS20-xserver-geode-gx2-hack
 - Probably Ubuntu-specific, our Xorg has a buggy Geode driver and so
needs that fix to force VESA instead :(

XS20-xserver-intel-desktop-hack
 - This fix is used in cases where thin clients are using netbook
hardware for their video card. It happens for example with
Disklessworkstation 1520 thin client that uses the exact same video card
as Asus's EEE 1000H netbook, making it impossible to distinguish based
on the PCIID, it uses hal to find the type of casing and disable the
LVDS output if it's a desktop.
 - Not having that fix makes a LVDS output appear in xrandr making it
harder to change the display resolution (you have to change both), the
fixes simply removes that output.

If some of these (likely not the Geode one) affects all distributions,
they should be integrated upstream.

- --
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com
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# This script forces the ShadowFB for the 3D rage ATI cards.
# It cannot be autodetected by upstream X.org currently.
# This is an Ubuntu specific workaround

if [ -n "$(PATH=/sbin:/usr/sbin:/bin:/usr/bin lspci -n |grep 1002:4757)" ]; then
    export X_DEVICE_OPTION_01='"ShadowFB" "True"'
fi

# This script forces the VESA driver for the AMD Geode GX2
# It cannot be autodetected by upstream X.org currently (LP: #327484)
# This is an Ubuntu specific workaround

if [ -z "$XSERVER" ] && [ -n "$(PATH=/sbin:/usr/sbin:/bin:/usr/bin lspci -n |grep 100b:0030)" ]; then
    . /etc/lsb-release
    if [ "${DISTRIB_RELEASE}" = "9.04" ]; then
        XSERVER=vesa
    else
        XSERVER=geode
        export X_DEVICE_OPTION_01='"AccelMethod" "XAA"'
    fi
fi

# This script disables LVDS for the intel laptop chipsets in desktop computers.
# It cannot be autodetected by upstream X.org currently.
# This is an Ubuntu specific workaround.

if [ -n "$(PATH=/sbin:/usr/sbin:/bin:/usr/bin lspci -n |grep 8086:27ae)" ] && [ "$(PATH=/sbin:/usr/sbin:/bin:/usr/bin hal-get-property --udi /org/freedesktop/Hal/devices/computer --key system.chassis.type)" = "Desktop" ]; then
    export X_DEVICE_OPTION_01='"monitor-LVDS" "LVDS"'
    monitor_hacks="$monitor_hacks add_intel_lvds"

    add_intel_lvds() {
        echo 'EndSection'
        echo 'Section "Monitor"'
        echo '    Identifier "LVDS"'
        echo '    Option "Ignore" "True"'
    }
fi