On 2015-03-30 13:08:11, Alfredo Palhares wrote:
> Any ideas how can I debug this problem further ?

Have a look at X's logfile, /var/log/Xorg.log. There should be messages that 
say the modes
are being removed, and why (not enough Vram, some parameter out of range, 
etc.). It's likely
warning or errors, so it should be among the output of egrep '\([WE]{2}\)' 
Xorg.0.log.

Good luck,
-Martin

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