Comment 2 for bug 556352

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Bryce Harrington (bryce) wrote : Re: Regression - no recognition of Samsung SyncMaster 740T. Regression in resolution setting support

Afaik we did not post any X.org updates yesterday (we're frozen for beta). Perhaps there was a kernel change causing this.

Can you please attach your /var/log/dpkg.log ?

Also, try booting an earlier kernel (hold down the left shift key during boot to get into grub, then select an earlier kernel version).