FWIW
Mine is a different Samsung machine (NP900x3d), my Ubuntu version is
12.10. I've tried with/without acpi_backlight=vendor .
More precisely this is my current boot command line:
luis@sams9:~$ cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-3.5.0-26-generic root=... ro quiet splash
i915.i915_ena
Updating my last post
1) Resolution problem
The screen.conf workaround posted before seems to be completely
reliable. No more resolution problems until now.
2) Brightness control to reduce flickering
As a matter of fact 'pci=noacpi' is not necessary. It is enough to pass
this parameter from gru
More tests:
I've been able to reproduce the random behavior reported by @Svante.
Sometimes the native resolution mode of the monitor (1366x768) is
recognized, sometimes it does not, and the system falls to 1024x768.
As a workaround I've created a typical screen.conf section in
/usr/share/X11/xorg
I can confirm this bug with the same machine: non-native resolution and
flickering, after installing the beta2 this morning.
A workaround for installation is to resort to the alternate-CD.
Rebooting after finishing installion ends in black screen, but changing
then into a console w/ CTL+ALT+F1 and
