I tried downgrading BIOS to all versions which supports AM3+ CPU's (3030, 3029, 3027) : same behaviour. I unplugged one of the 2 video card : same behaviour.
then I realized that, on the first screenshot, it seems to hang after ACPI. So instead of testing with BIOS default settings, I turned off many options, and it worked ! then I switched on those options one by one, to find that it's C1E that has to be disabled. replugging the 2nd card and flashing to le lastest BIOS works fine if I disable C1E. C1E support is not very important as C6 works (CPU freq slow down when idle). kernel loads correctly, X server doesnn't work properly on 13.04 and saucy daily. but it works fine on 12.04 ! but this is another bug. ** Summary changed: - can't boot ubuntu with crossfire + can't boot ubuntu with C1E support enabled -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1201234 Title: can't boot ubuntu with C1E support enabled Status in “linux” package in Ubuntu: Incomplete Bug description: hi ; sorry not following bug report procedure, but as the computer involved isn't able to boot, I must fidn a way to report. So the computer is hanging very quickly at the beggining of the boot (no kernel panic), then progressing a little when pressing a key, and then it is completly hanged (keyboard unresponsive, but no kernel panic). Here are the details : tried ubuntu 13.04, 12.04, live-cd, installed (before I bought my cards) ... same behaviour card are 2x radeon 7850 motherboard is Asus M4A89GTD PRO/USB3 CPU is AMD FX 8320 I'll add 2 "screenshots" corresponding to the 2 hangs described. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1201234/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp