I am pleased to announce that I've patched the Atrix webtop files, allowing us to run webtop over HDMI on HKTW, AT&T 4.5.91 and ORFR 4.5.2A based system images (yes this will work on custom ROMs too), without the requirements of an official dock! 
The goal is to enable the Webtop function over HDMI on any display, not just official Motorola Docks. There seem to be more HDMI display options that are disabled, for example: Clock Widget, Gallery, Music, Home. Sadly, none of these options actually do anything on the big screen, they just display the interface on the phone
However, Webtop works great! Just use the instructions below to replace the original DockService and PortalApp apk's.
Included are two versions of the DockService in the zip attached to this thread, one will enable only the additional Webtop mode for HDMI. The second one will be a "dev" version that enables every option, for those of you that are curious and/or want to try to get some of them to work over HDMI! Only one version of PortalApp is included, which is required for webtop to work, with both versions of the DockService.
One particularly interesting option that many of you are interested in is included in the dev build too: Mirror phone on display
. Sadly, as stated above, it does not work (yet?). Will you get it to work? 
Requirements:
First, unpack the attached zip-file.
Go into the correct directory for your version.
Now run (in a terminal)
NOTE: if these instructions dazzle you, try Ronaldo's CWM package (for AT&T only!): http://forum.xda-developers.com/showpost.php?p=15871616&postcount=53
NOTE2: ignore errors concerning odex files if you are deodexed.
NOTE3: If you have issues with the Touchscreen Input not working, try a reboot first. If the problem doesn't go away: fastboot flash a (stock) webtop image for your base ROM. It is currently unclear what causes this problem, but my guess is a bad flash of the webtop partition, possibly CWM related. Reboot/reflash has solved the problem for a few people encountering this issue.
Thanks to Gizmo, eval & romracer!
The goal is to enable the Webtop function over HDMI on any display, not just official Motorola Docks. There seem to be more HDMI display options that are disabled, for example: Clock Widget, Gallery, Music, Home. Sadly, none of these options actually do anything on the big screen, they just display the interface on the phone
However, Webtop works great! Just use the instructions below to replace the original DockService and PortalApp apk's.
Included are two versions of the DockService in the zip attached to this thread, one will enable only the additional Webtop mode for HDMI. The second one will be a "dev" version that enables every option, for those of you that are curious and/or want to try to get some of them to work over HDMI! Only one version of PortalApp is included, which is required for webtop to work, with both versions of the DockService.
One particularly interesting option that many of you are interested in is included in the dev build too: Mirror phone on display
Requirements:
- Have one of the supported build and functional webtop flashed
- Be rooted
- Be able to work with adb
First, unpack the attached zip-file.
Go into the correct directory for your version.
Now run (in a terminal)
Code:
adb push DockService.apk /sdcard/
adb push PortalApp.apk /sdcard/
adb shell
# you are now in the phone shell
su
mount -o rw,remount /dev/block/mmcblk0p12 /system
mv /system/app/DockService.apk /system/app/DockService.apk.bak
mv /system/app/PortalApp.apk /system/app/PortalApp.apk.bak
mv /system/app/DockService.odex /system/app/DockService.odex.bak
mv /system/app/PortalApp.odex /system/app/PortalApp.odex.bak
rm /data/dalvik-cache/*DockService* /data/dalvik-cache/*PortalApp*
cd /system/app
cp /sdcard/DockService.apk ./
cp /sdcard/PortalApp.apk ./
chown 0:0 ./DockService.apk
chown 0:0 ./PortalApp.apk
chmod 644 ./DockService.apk
chmod 644 ./PortalApp.apk
reboot
NOTE2: ignore errors concerning odex files if you are deodexed.
NOTE3: If you have issues with the Touchscreen Input not working, try a reboot first. If the problem doesn't go away: fastboot flash a (stock) webtop image for your base ROM. It is currently unclear what causes this problem, but my guess is a bad flash of the webtop partition, possibly CWM related. Reboot/reflash has solved the problem for a few people encountering this issue.
Thanks to Gizmo, eval & romracer!
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