Mitch Golden <[email protected]> wrote:I am posting this here because I
don't know exactly where it should be
posted.
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/X11/xorg.conf.d
containing the lines:
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
Option "RegistryDwords" "PowerMizerEnable=0x1;
PerfLevelSrc=0x2222; PowerMizerDefault=0x3; PowerMizerDefaultAC=0x3"
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://forums.opensuse.org/showthread.php/410089-nvidia-powermizer-how-tweak
(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://www.nvidia.com/download/driverResults.aspx/76278/en-us
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.
Perhaps the installer can be made to configure this stuff properly for
nvidia machines, or at least instructions can be added.
I have additional bugs/comments to make on the behavior of plasma 5. I
don't see any instructions on the download place as to where they should
go. Pointers kindly appreciated.
- Mitch Golden
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Hi Mitch
Thank you for this excellently written Bug report.
I have opened a Bug on launchpad.net for this issue, with my initial thoughts
being that the Ubiquity installer team will want to know about this.
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1394856
I shall look to triage in due course, as I have a Samsung with an Nvidia GPU
For other bugs and issues, you can also report them to bugs.launchpad.net and I
would encourage you to open a launchpad account. This will enable you to
comment and add detail to the above Bug too.
Finally you can also get hold of us on IRC in #kubuntu or #kubuntu-devel
HTH
Rick Timmis
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