Comment 30 for bug 1525615

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penalvch (penalvch) wrote : Re: Ubuntu not booting on iMac 5K with ACPI enabled

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://wiki.ubuntu.com/Bugs/Upstream/kernel to the appropriate mailing list (TO Rafael J. Wysocki, and Len Brown, CC linux-acpi)?

Please provide a direct URL to your post to the mailing list when it becomes available so that it may be tracked.

Thank you for your understanding.