kubuntu 14.10 plasma 5 spins up PowerMizer
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
xorg (Ubuntu) |
Expired
|
Low
|
Unassigned |
Bug Description
I have installed 14.10 Plasma 5 on my laptop, which is a vintage 2011
System 76. Of greatest significance is that it has an nvidia 560M
graphics card in it.
When I first installed 14.04, I noticed that the PowerMizer report of the
NVIDIA X Server Settings would report that the graphics chip's clock was
more or less constantly spun up to its highest clock rate. Heat and power
use were very high, and I constantly heard the fan running.
I found there were two ways to fix this:
(1) Add a file called 05-nvidia.conf to /usr/share/
containing the lines:
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
Option "RegistryDwords" "PowerMizerEnab
EndSection
This pegged the graphics card at its lowest possible clock rate, which was
adequate for most things but sometimes led to bad playback on some videos.
See: https:/
(2) Revert to the 304 driver. This still spun up to high clock rates a
bit more often than it seemed to need to, but was fairly reasonable
otherwise.
I expected that this would soon be rectified, since I saw that version
337.25 of the driver allegedly fixed some issue with performance in KDE:
http://
Jump ahead to yesterday when I installed 14.10 plasma 5 -
I noticed that even with the 304 driver the PowerMizer reported the clock
at its highest rate. With nothing moving on the screen at all and my not
touching the mouse, it was pegged.
I found that even installing the xorg-edgers driver (340 I believe) had no
effect. Furthermore, 340 did not respond to the xorg.conf settings file
above. The only way I can get plasma 5 to run reasonably on this machine
is to revert to 304 and *also* put the settings file in. This is of
course not optimal.
Is there some way to determine what exactly is happening that causes the
graphics clock to spin up so high? Nothing much is happening. Just
scrolling a window in firefox is sufficient to start it.
ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: xorg 1:7.7+7ubuntu2
ProcVersionSign
Uname: Linux 3.16.0-25-generic x86_64
NonfreeKernelMo
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CurrentDesktop: KDE
Date: Fri Nov 28 00:00:27 2014
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
Sorry, I see that this bug is a duplicate of 1394856 which has already been transferred to xorg.