The reverted radeon patchset didn't help for long. Actually I don't know
why it worked at all, but probably the HW was just breaking down slowly.
What finally helped was replacing my DisplayPort to DVI adapter for a
new one. This doesn't seem to be a software problem, as the latest
kernel works aga
** Tags added: patch
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https://bugs.launchpad.net/bugs/1559051
Title:
Instable DisplayPort with latest radeon driver
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