[ubuntu-studio-devel] Possible explanation of my problems with Ubuntu Studio 18.10 and video may require more than 768MB in some cases

[Lawrence Boothby]

Ubuntu 17.xx and 18.xx have been unusable for me on an Athlon II x2 280,
but run perfectly on my Intel i3. The symptoms I was experiencing were
cursor lagging so far behind the mouse that it was a challenge even to shut
the system down, let alone use it. Interestingly, LinuxMint 19 based on
Ubuntu 18.04 works fine on both of my computers.


On Fri, Dec 7, 2018 at 2:54 PM Erich Eickmeyer <erich at ericheickmeyer.com>
wrote:

> On Friday, December 7, 2018 2:42:07 PM PST Mike Squires wrote:
> > On 12/5/18 5:56 PM, Ralf Mardorf wrote:
> > > Hi,
> > >
> > > the described performance issues could also happen, if a disc drive is
> > > broken. Sometimes strange things also happen, if the CMOS
> > > battery is getting low.
> >
> > I ran the "unixbench" benchmark as a quick-and-dirty test of the system's
> > overall performance under Ubuntu Studio 16.04.  The "System Score" was
> > 562.5 for a single CPU, 2289 for all 8.  The specific test numbers were
> > what I'd expect from a system with 8 2 GHz Xeon cores (File copy 4096 was
> > 568018 KBps single CPU, 975956 KBps with all 8).  I did notice that the
> > percent of time in wait states was always well below 1%, usually 0.2% or
> > less.
> >
> > I will be shortly upgrading memory to 20GB and CPUs to 3 GHz quad core.
> I
> > will have to reorganize the drive array in order to be able to set up a
> > test system, that may happen after New Year's.
> >
> > 16.04 is working well for me, but I'd like to figure out why 18.xx and my
> > hardware don't want to coexist.
> >
>
> Hi Mike,
>
> I have a theory on this one since I saw that you're using an AMD graphics
> card. Between 16.04 and 18.04, the open source AMD driver was changed from
> the
> "radeon" to the "amdgraphics" driver.  With my machine, which has AMD
> graphics, I had some intermittent slowness especially with 18.10. I ended
> up
> fixing it by adding this to the GRUB_CMDLINE_LINUX line in
> /etc/default/grub:
>
> radeon.cik_support=0 radeon.si_support=0 amdgpu.dc=1 amdgpu.cik_support=1
> amdgpu.si_support=1 amdgpu.dpm=0
>
> The key was the "amdgpu.dpm" line, which, with the 0, disables the dynamic
> power management module. The dynamic power management was causing my
> graphics
> to crash if I so much as coughed.
>
> I hope this helps. At least it's worth a shot.
>
> Erich
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