Marcelo Magno T. Sales posted on Tue, 19 Jul 2016 08:22:32 -0300 as
excerpted:
> I'm facing the same problem in Kubuntu 14.04 with KDE 4.14.13, the
screen
> saver and energy saving both stopped working a few weeks ago. I can
still
> turn off the monitors manually, using xset dpms force off. I can also
start
> the screen saver manually, but neither one work automatically anymore.
> Tried:
>
> xset s on
> xset +dpms
> xset dpms 0 0 3600
>
> No luck. Eventually the screen saver and energy saving start working
> automatically again out of nothing, but soon they stop working again. If
> you find a solution, please post here.
You're better than I'm seeing here...
Gentoo ~amd64 with kde frameworks5/plasma5 from git, kernel 4.6.0 and now
4.7-rc7, radeon "turks" graphics (hd6670, IIRC) with the native X/kernel/
mesa drivers, triple monitor, two of which are actually TVs used as
monitors.
About a month ago the system started _crashing_ (!!) if I left it idle
long enough to power-down the monitors.
With a bit of experimentation I found I can set ...
xset -dpms
... so they don't power down on their own, and just turn off the monitors
(yes, all three, one at a time) manually if I want to. KDE/plasma's
screen locker still kicks in fine, and I can unlock and continue.
If I leave dpms on, after the screen blanks I can still catch it and
continue, as long as the monitors haven't fully shut off yet.
And as I mentioned, I can turn the monitors off manually, no crashing as
long as I don't have dpms on and let them turn off automatically.
But if I leave dpms on and let them power down automatically, crash! The
kernel dies, tho sometimes it stays just enough alive so magic-SRQ-B
(reboot) works, but the other magic-SRQ sequences don't respond and
sometimes B doesn't either, and I have to hardware reset.
Regardless, if I don't actually power-down the system, on reboot it fails
to detect the SSDs properly and won't reboot properly as a result. I
have to actually power-down the system, leave it off several seconds,
then power it back on, in ordered to get both the SSDs and the spinning
rust to properly detect.
As a result I suspect it's something to do with an xorg/mesa/kernel
update that happened about then, since the problem seems to be a graphics
driver not resetting properly on monitor auto-off, triggering both the
crash and the storage device detection failure on reboot, unless I've
actually powered down the system for a few seconds to full-hardware-reset.
Again, I can xset -dpms and power down the monitors manually, and I'm
fine. But if I let them auto-powerdown, hard crash!
Which is definitely worse than having them simply fail to auto-powerdown
at all, the symptom you two are reporting.
But it could well be related. And if so, it's gotta be a kernel/X/mesa
update that we've all gotten triggering the problem, since I'm seeing
this on gentoo with plasma5, and you're seeing the dpms failures on
fedora and ubuntu with kde4.
--
Duncan - List replies preferred. No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master." Richard Stallman
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