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rxseger / linuxproblems

Problems I encountered with Linux-based software
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No graphical video output on iMac (enable 'nomodeset') #2

Open rxseger opened 8 years ago

rxseger commented 8 years ago

iMac (Retina 5K, 27-inch, Late 2014) Ubuntu 16.04 LTS amd64 booted using Mac Linux USB Loader (MLUL)

The system boots, showing the textual display, but as soon as it attempts to switch to graphical video, the screen goes black.

rxseger commented 8 years ago

Fix/workaround: in MLUL, choose advanced boot options, select "nomodeset". This disables kernel mode setting (KMS), which is "a method for setting display resolution and depth in the kernel space rather than user space"

Tip from https://help.ubuntu.com/community/Intel_iMac "Edit kernel parameters and add radeon.modeset=0 nomodeset". This (old) Ubuntu wiki page makes reference to the "Ubuntu Alternate installer, which runs in text mode", but I can find no such image for Ubuntu 16.04. At least the nomodeset workaround works for now.