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[Hanine <844307@xxxxxxxxxxxxxxxxxx>]

Actually, I managed to get the full resolution of my External Monitor which is 1920X1080 through HDMI (Ubuntu 11.10 on a DELL XPS 15) by editing bumblebee nvidia.xorg.config file (/etc/bumblebee). This file has an option (readEdid = false). Switching it to true enables Nvidia card to read the external monitor EDID information and then use its native modes and refreshing rates. you have to reboot after changes are committed.
If you run:     optirun nvidia-settings -c :8       and select your HDMI monitor, you will see it is recognized with native resolution.
Besides, by installing a windows manager (OpenBox) along with Synergy, I was able to have a pseudo extended desktop.

See the last posts here:

https://github.com/MrMEEE/bumblebee/issues/75#issuecomment-2798937

the user: Camelcase managed to have a working Desktop using external
monitor through HDMI on his Dell Alienware.

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https://bugs.launchpad.net/bugs/844307

Title:
  No HDMI support.

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