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I'm having a hard time tracing this down. I updated to Kubuntu 16.04
(from Kubuntu 15.10 - that was using the Linux Crimson 15.12 driver) a
couple days ago on my notebook (HP Pavilion, A10-8700P APU), and ever
since I've been having random black screens.
I started debugging the driver, then thought it might be a DPMS issue
(it's not - I have DPMS fully disabled currently), and now I'm back to
debugging the driver.
I don't have any remnants of the former closed Crimson display driver
and never had an xorg.conf file (I made a small one that I'm using at
the moment consisting of only a server layout to ensure screen savers,
DPMS, etc are all off).
The Black screen can happen any time from the login screen until hours
later. I can ssh into the system to shut it down. And just discovered
that if I unplug the system from it's power brick, I can close the lid -
the system will goto sleep. When I flip the screen back up, the system
wakes up and the screen works again for 1-2 minutes.
I don't see any errors in the log files (well, outside some nasty
looking ACAPI errors in dmesg).
HOT TO REPRODUCE:
Boot system and use normally or simply leave system alone. Blank screen will
happen any time after x comes up.
EXPECTED RESULT:
Screen doesn't blank unless a screen saver or power saver kicks in.
SYSTEM INFO:
Purchased Dec 2015 (build date from BIOS - Aug 2015), HP Pavilion 15" notebook,
AMD A10-8700P "Carrizo", 16GB RAM, 960GB SSD
** Affects: xorg (Ubuntu)
Importance: Low
Status: Incomplete
** Tags: bot-comment xenial
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AMDGPU driver problems on "Carrizo" APU
https://bugs.launchpad.net/bugs/1577074
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