I read your post over at Kubuntu forums and copy a portion
"I have experienced exactly the same problem with my HP Compaq 615 notebook
KMS si not the source of problem,also radeon.modeset=0 at Grub kernel line doesn't solve anything
The only way to boot is to append acpi=off paramter
Problem is caused by pcmcia and pcmcia_core acpi modules(strange indeed that they are loaded,becouse my laptop has a express not pcmcia slot neutral)
Boot with acpi=off and add these modules in rc.conf with ! to disable them from loading with system,boot again normally and everything will work fine now with acpi enabled
I also notice that people with similar hardware like my netbook(AMD chipset)have same problems
I hope that this helps and sorry for crappy english big_smile
P.S. Problem is linked with new 2.6.3x kernels,it's not distro releated(same thing is happening on OpenSUSE 11.2 and last version of Ubuntu)and its upstream-on older kernels up to 2.6.29 everything works fine smile"
I trying to get this all figured out. I put in "acpi=off" into my grub setup. This makes the computer boot up "properly" (text mode instead of the linux mint logo). As well, it boots 100% of the time. I then get to the gdm. That's all good. Once I login, I have not power management icon. That's kind of important when using a notebook. When I shutdown, it gets to system halted, then I have to manually press the power button to turn off the power.
I asked someone how I can disable the pcmcia and pcmcia_core modules, since there is no rc.conf in mint. He mentioned that I could blacklist them in /etc/modprobe.d/ I then created a file called pcmcia-blacklist.conf There I wrote:
I then removed the acpi=off part of the grub configuration. However, it now has the black screen problem again. I don't want to go the vesa route. Can someone help me out? I know this topic is supposed to be solved, but I didn't want to start a whole new topic for the same problem.