i find a solution on a other forum : (but i do not know why) 
In the file rc.local :
éditer le /etc/rc.local et y ajouter : sudo setpci -s 00:02.0 F4.B=00 juste 
avant exit 0 dans /etc/rc.local 
and then all is ok i have a screen of 1366x768 , my pc is Acer Aspire 5736z and 
this solution is good for Linux Mint, Xubuntu 13.04
and i test the others.
Thanks
Pierre

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https://bugs.launchpad.net/bugs/1051824

Title:
  [regression] Acer Aspire 5736z needs nomodeset or acpi_osi=Linux

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