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Originally Posted by syg00
I would have thought KMS would be on by default in any recent Ubuntu kernel.
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Indeed. However, I compiled a special kernel with some patches. Now the screen works iff I specify nomodeset in the boot parameters or if I boot in recovery mode which also specifies nomodeset.
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You'd better describe in detail what you did and what happened - in detail. When does the screen "blank out" ?.
Do you get a grub boot option screen ?. If not, did you ever get one ?.
Data like that will help us get started.
As an aside, about the only debugging you will be able to do without the appropriate kernel options already compiled in is using a serial console to get the messages. But you still need to be able to update the boot options to get even that ...
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I compiled a custom Linux kernel. I managed to get to the boot prompt where I selected my new kernel. Everything went well except the screen went blank halfway through. I managed to ssh into the system to get some useful info from dmesg. I found two messages that hopefully will give a more helpful hint on what's wrong here:
[drm:i915_gem_init_stolen [i915]] *ERROR* conflict detected with stolen region: [0x7ce00000 - 0x7ee00000]
[drm:intel_dp_complete_link_train [i915]] *ERROR* failed to train DP, aborting
I then googled the two messages to see what's going on. I'm still working on the first message.
According to
https://bugs.freedesktop.org/show_bug.cgi?id=73694, it suggests that the latter does not give a conclusive hint on what's going wrong.