On 10/24/2013 11:57 AM, Nio Wiklund wrote:
On 2013-10-24 19:30, Aere Greenway wrote:
On 10/24/2013 01:20 AM, Leszek Lesner wrote:
Tryout the terminal command
Cat /proc/cpuinfo
If this shows processor 0 and a processor 1 the system recognized two
CPUs and is using them.
The Qsynth through pulseaudio thing is bad as it had (from my
experience till pulseaudio 2.0) a bad latency. Use Alsa here instead
(needs to suspend pulseaudio first) and test again.
I browsed (using the file browser) to /proc, and double-clicked the
cpuinfo file.
It showed "Intel Core Duo 2" (something like that - I'm going from
memory), and the number of cores was displayed as 1. Information
(options such as pae) was shown only for one CPU.
I then tried booting the Ubuntu 13.04 amd64 live CD.
When I hold down the Options key while powering up, with Ubuntu, there
are two icons having the round CD icon at the right. The first of those
two, is labeled "Windows". The second is labeled "EFI Boot".
I booted the Ubuntu 13.04 DVD using the first ("Windows") CD icon.
It came up, and ran fine, but system-monitor showed only 1 CPU, and the
"/proc/cpuinfo" file agreed with that assessment. There were no desktop
hangs observed.
I shut it down, and (again holding down the "Options" key when it
powers-up) this time I selected the "EFI Boot" CD icon at the far right
of the list.
It immediately showed a text line saying secure boot was not available,
and then presented me with a text menu with entries (as I recall):
Try Ubuntu
Install Ubuntu
Check Disk for Defects
I chose "Try Ubuntu", and it booted (eventually) directly into Ubuntu
Unity desktop. In this case, system-monitor showed two CPU's, and the
"/proc/cpuinfo" file also showed two cores (and info/options about each
of them).
However, after awhile running, the desktop hung, and I could not do
anything further but power down (I did wait quite awhile for it to
un-freeze).
I then tried the Lubuntu 13.10 amd64-mac live DVD, wanting to try the
"EFI Boot" option, but only the "Windows" CD icon was available. On
booting this CD, only one CPU was available.
I also tried selecting rEFIt on power-up, and it showed the Linux
penguin icon (for the Linux partition on the hard disk), and also
another penguin icon at the far right, which when highlighted, indicated
it was on CD (DVD). I selected this (far right) icon, and booted it.
When it came up, it had only one CPU (the "/proc/cpuinfo" file indicated
that the number of cores was "1"). The system did not hang in the time
I was using it.
Regarding my use of PulseAudio, I install it so that I can access the
Java Sound (Gervill) synthesizer. If I don't load PulseAudio (and
pavucontrol), I cannot use that synthesizer. On all Ubuntu variants,
the Java Sound synthesizer expects PulseAudio to be used.
When I re-configured Qsynth to use JACK, there were no more cut-outs on
the sound. But I (as always with Linux on this MacBook) would only
produce audible sound with the laptop speakers - plugging in the
amplifier cable into the headphone jack effectively shut off all sound.
--
Sincerely,
Aere
Interesting. It seems there are fundamental problems to run an Ubuntu
based OS on this computer.
Best regards
Nio
Nio, and all:
I tried running an openSUSE 12.3 live-DVD on that machine, but it failed
to run.
I tried Ubuntu/Unity 13.10 i386 on it, and it (like Lubuntu) ends up
with only one CPU.
On that last attempt, I looked at the system log.
I noticed (in particular) "NX (executive disable) is active".
Also, in the log, I extracted the following section, which seems
relevant to the multi-processor problem:
Oct 24 21:05:35 ubuntu kernel: [ 0.020314] CPU: Physical Processor ID: 0
Oct 24 21:05:35 ubuntu kernel: [ 0.020316] CPU: Processor Core ID: 0
Oct 24 21:05:35 ubuntu kernel: [ 0.020321] mce: CPU supports 6 MCE banks
Oct 24 21:05:35 ubuntu kernel: [ 0.020332] CPU0: Thermal monitoring
enabled (TM2)
Oct 24 21:05:35 ubuntu kernel: [ 0.020347] Last level iTLB entries:
4KB 128, 2MB 4, 4MB 4
Oct 24 21:05:35 ubuntu kernel: [ 0.020347] Last level dTLB entries:
4KB 256, 2MB 0, 4MB 32
Oct 24 21:05:35 ubuntu kernel: [ 0.020347] tlb_flushall_shift: -1
Oct 24 21:05:35 ubuntu kernel: [ 0.020791] Freeing SMP alternatives
memory: 28K (c1a3e000 - c1a45000)
Oct 24 21:05:35 ubuntu kernel: [ 0.024023] ACPI: Core revision 20130517
Oct 24 21:05:35 ubuntu kernel: [ 0.031484] ACPI: All ACPI Tables
successfully acquired
Oct 24 21:05:35 ubuntu kernel: [ 0.031762] ftrace: allocating 27134
entries in 53 pages
Oct 24 21:05:35 ubuntu kernel: [ 0.044112] Enabling APIC mode: Flat.
Using 1 I/O APICs
Oct 24 21:05:35 ubuntu kernel: [ 0.044586] ..TIMER: vector=0x30
apic1=0 pin1=2 apic2=-1 pin2=-1
Oct 24 21:05:35 ubuntu kernel: [ 0.084546] smpboot: CPU0: Intel(R)
Core(TM)2 Duo CPU P7350 @ 2.00GHz (fam: 06, model: 17, stepping: 0a)
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] Performance Events: PEBS
fmt0+, 4-deep LBR, Core2 events, Intel PMU driver.
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] ... version: 2
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] ... bit width: 40
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] ... generic registers: 2
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] ... value
mask: 000000ffffffffff
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] ... max
period: 000000007fffffff
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] ... fixed-purpose events: 3
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] ... event
mask: 0000000700000003
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] CPU 1 irqstacks,
hard=f50e6000 soft=f50f0000
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] smpboot: Booting Node 0,
Processors #1 OK
Oct 24 21:05:35 ubuntu kernel: [ 5.178391] smpboot: CPU1: Not responding
Oct 24 21:05:35 ubuntu kernel: [ 5.178411] Brought up 1 CPUs
Oct 24 21:05:35 ubuntu kernel: [ 5.178414] smpboot: Total of 1
processors activated (3979.99 BogoMIPS)
Oct 24 21:05:35 ubuntu kernel: [ 5.178532] NMI watchdog: enabled on
all CPUs, permanently consumes one hw-PMU counter.
Oct 24 21:05:35 ubuntu kernel: [ 5.180156] devtmpfs: initialized
--
Sincerely,
Aere
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