tedaste, this would appear a two part problem (acpi and graphics), but
let the initial focus be on the first issue of not able to boot up at
all without acpi-off. Hence, the issue you are reporting is an upstream
one. Could you please report this problem following the instructions
verbatim at https
Without nomodeset it does boot to a working system (I can ping it)
however the last thing you see on the screen is
Switching to radeondrmfb
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Title
tedaste, to clarify, if you use just acpi=off, without nomodeset, are
you able to boot into a working system?
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Title:
Ubuntu not booting on iMac
** Tags removed: kernel-bug
** Tags added: kernel-bug-exists-upstream kernel-bug-exists-upstream-4.4-rc6
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Title:
Ubuntu not booting on iMac 5K wi
Still stops at Loading Initial ramdisk
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Title:
Ubuntu not booting on iMac 5K with ACPI enabled
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tedaste, could you please test the latest mainline kernel (4.4-rc6) and
advise to the results?
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Title:
Ubuntu not booting on iMac 5K with ACPI en
OK done
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Title:
Ubuntu not booting on iMac 5K with ACPI enabled
To manage notifications about this bug go to:
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apport information
** Description changed:
With a 27in 5k ( new as of two weeks ago) I'm unable to boot. The
applies to both the live installer and a system installed on disk. I
just get a blank screen. It gives a blank screen event if the "quiet" is
removed from the kernel parameters. Th
tedaste, using the default Ubuntu kernel (not 3rd party), could you please
utilize your WORKAROUNDs, boot into a working system, and then execute the
following via a terminal as it will attach necessary debugging information:
apport-collect 1525615
** Tags added: xenial
** Description changed:
I tried the daily-live, still the same problem
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Title:
Ubuntu not booting on iMac 5K with ACPI enabled
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tedaste, to see if this is already resolved in Ubuntu, could you please
test http://cdimage.ubuntu.com/daily-live/current/ and advise to the
results?
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apport information
** Tags added: apport-collected
** Description changed:
With a 27in 5k ( new as of two weeks ago) I'm unable to boot the kernel
without parameter "acpi=off:", it also needs "nomodeset" into order to
get a working system.
The applies to both the live installer and a
When I tried the latest 4.4 it didn't work. When I included 'nomodeset'
it got to "loading initial ramdisk" and stopped.
When you boot with acpi=false the GUI is slow because it's using the
Vesa driver
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acpi = ht does not work. 14.04 and 13.04 won't boot without acpi=off
either.
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Title:
Ubuntu not booting on iMac 5K with ACPI enabled
To manage n
I'm running into the same issue. Tried Kernel 4.4-rc5, would also not
boot without acpi=off and nomodeset.
After booting with those two parameters, the GUI is very sluggish,
animations take on the order of seconds.
Also lost mouse and keyboard (wireless) functionality when upgrading -
possibly u
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.4 kernel[0].
If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.
If the mainline kernel does not fix th
** Package changed: ubuntu => linux (Ubuntu)
** Tags added: wily
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Title:
Ubuntu not booting on iMac 5K with ACPI enabled
To manage notification
When I tried "apc=force" I got a couple of lines on the screen, ending
with Loading initial ramdisk
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Title:
Ubuntu not booting on iMac 5K wit
Thank you for taking the time to report this bug and helping to make
Ubuntu better. It seems that your bug report is not filed about a
specific source package though, rather it is just filed against Ubuntu
in general. It is important that bug reports be filed about source
packages so that people
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