Played with the clocksource parameter as well. "acpi_pm" will freeze the system within seconds after gdm starts. "tsc" is unstable due to having a multi-core setup. Testing "hpet" now - which is the clocksource the system would fall back to anyways after identifying tsc to be unstable.
There might be more than one reasons for my system freezing. "iwlagn" shows "Microcode SW error detected" and the clocksource seems to be a problem, too.
Played with the clocksource parameter as well. "acpi_pm" will freeze the system within seconds after gdm starts. "tsc" is unstable due to having a multi-core setup. Testing "hpet" now - which is the clocksource the system would fall back to anyways after identifying tsc to be unstable.
There might be more than one reasons for my system freezing. "iwlagn" shows "Microcode SW error detected" and the clocksource seems to be a problem, too.