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INTRODUCTION

imacquantal.jpg

" Quantal came to imac, with a friendlier attitude "

KNOWN ISSUES

The current known issues, which may or may not be fixed in the near(or far) future are below, please note the differences from the original 12.04 observation to the observation at its side and consider them on the instructions which comes next(avoid unneeded steps):

Cannot boot ubuntu without rEFInd or similar(probably no longer necessary on 12.10, but it still simplifies things)

Noisy screen(most noticeable against dark-grey backgrounds): https://bugs.launchpad.net/ubuntu/+source/fglrx-installer/+bug/1020374(Must retest on 12.10)

Cannot properly use the mac default EFI system without running Super Grub 2 Disk once to enter the ubuntu OS you installed(must retest on 12.10).

Overall bad apple keyboard and mouse recognition.

Brigthness control not working by default, very bright screen by default: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1020373(it does worked at some point in 12.10, must test to see how)

For Brazilian language you will need to do additional configuration. https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1012695

The Ubuntu open source driver for radeon hd 6770m is hugely slow, mainly for games and other graphic intensive tasks; no ubuntu packaged AMD driver will work out of the box due to video memory recognition issues(https://bugs.launchpad.net/ubuntu/+source/fglrx-installer/+bug/1004546).(default driver works better on 12.10, but not enough. ubuntu packaged drivers work on 12.10, but with a detail discussed later)

You will need the usb keyboard to choose ubuntu at rEFInd, otherwise you will have to pair again your keyboard as described at mac manual at OS X everytime you want to do the above. You will also need a usb mouse or wacom tablet.(Seems to still apply on 12.10 ubuntu)

Everytime you switch which OS you load, that OS will take over the keyboard and mouse, and you will have to setup them again at the other OS to get it to work there, which in turn will make the other OS lose keyboard and mouse input again until pairing is done again there. In resume, currently you will never get both OS's to have simultaneous wireless keyboard and mouse input.(must retest on 12.10)

Your headphones will not work, just built-in speaker(https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1003039). Workaround already avaible.(workaround still needed on 12.10)

Needs patience to setup keyboard and mouse at ubuntu with the default bluetooth manager(bluez, https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1001825); maybe installing blueman speeds things a bit, thought bluez seems more reliable after device detection(may be just me).(seems still true on 12.10)

IF THINGS GET NASTY(ubuntu 12.04 specific)

enter your current linux kernel image under recovery mode > ¨drop to root terminal¨ > type and confirm:

DOING IT

With 12.10, after that everything will work right away after boot.

sdXY is the / partition of your ubuntu(ex: mine was sda7), sdX is the root of the ubuntu hd(ex: sda at my last example)

From ubuntu 12.04 to 12.10, it seems grub-efi now demands an additional argument after grub-install keywords.

nopat is not needed for ubuntu 12.10.

TESTING UNSUPPORTED NEWER KERNELS

CONSIDERATIONS

CREDITS


CategoryMac

ubuntupreciseon2011imac (last edited 2012-11-07 22:13:10 by m153)