[arch-general] Switching back from nouveau doesn't work - Was: Proprietary nvidia driver for different kernels

[Ralf Mardorf]

Hi :)

I set up CPU frequency scaling as needed and run the Jack MIDI latency
tests again. I suspect the nouveau driver still is broken [1]. There are
still Xruns and there's an absurd high peak.

Now I need to get my nvidia/nv set up back, but this script
https://wiki.archlinux.org/index.php/NVIDIA#Switching_between_nvidia_and_nouveau_drivers is useless, because of

[spinymouse at archlinux ~]$ cat /etc/modprobe.d/modprobe.conf
cat: /etc/modprobe.d/modprobe.conf: No such file or directory
[spinymouse at archlinux ~]$ grep MODULES /etc/mkinitcpio.conf
# MODULES
#     MODULES="piix ide_disk reiserfs"
MODULES=""
# 'filesystems' is _required_ unless you specify your fs modules in
MODULES
##   This setup specifies all modules in the MODULES setting above.

Since the nv driver still is installed, I also tried to blacklist
nouveau, but starting GDM always failed.

I prefer not to restore Arch from a backup. There must be a way to get
rid of nouveau and get nv and nvidia working again.

At the moment I'm stuck.

Regards,
Ralf

[1]
[spinymouse at archlinux ~]$ cpupower frequency-info | grep The\ gov
The governor "ondemand" may decide which speed to use

[spinymouse at archlinux ~]$ sudo cpupower frequency-set -g performance

[spinymouse at archlinux ~]$ cpupower frequency-info | grep The\ gov
The governor "performance" may decide which speed to use

[spinymouse at archlinux ~]$ uname -r
3.4.4-rt14-1-rt

[spinymouse at archlinux ~]$ hdspmixer 
Card 0: RME AIO S/N 0x579bcc at 0xfdbf0000, irq 18
Card 1: TerraTec EWX24/96 at 0xbf00, irq 20
Card 2: TerraTec EWX24/96 at 0xbb00, irq 21

[spinymouse at archlinux ~]$ sudo chgrp audio /dev/hpet
[spinymouse at archlinux ~]$ sudo chmod g+rw /dev/hpet
[spinymouse at archlinux ~]$ sudo modprobe snd-hrtimer

[spinymouse at archlinux ~]$ /etc/rc.d/rtirq status         
  PID CLS RTPRIO  NI PRI %CPU STAT COMMAND	
   59 FF      90   - 130  0.0 S    irq/8-rtc0	
  300 FF      85   - 125  0.0 S    irq/18-snd_hdsp	
  335 FF      80   - 120  0.0 S    irq/20-snd_ice1	
  338 FF      79   - 119  0.0 S    irq/21-snd_ice1	
  116 FF      70   - 110  0.0 S    irq/19-ehci_hcd	
  118 FF      70   - 110  0.5 S    irq/16-ohci_hcd	
  121 FF      69   - 109  0.0 S    irq/17-ohci_hcd	
  125 FF      68   - 108  0.0 S    irq/17-ohci_hcd	
   57 FF      65   - 105  0.0 S    irq/1-i8042	
   20 FF      50   -  90  0.0 S    irq/9-acpi	
  105 FF      50   -  90  0.1 S    irq/22-ahci	
  123 FF      50   -  90  0.0 S    irq/18-ohci_hcd	
  127 FF      50   -  90  0.0 S    irq/18-ohci_hcd	
  130 FF      50   -  90  0.0 S    irq/14-pata_ati	
  131 FF      50   -  90  0.0 S    irq/15-pata_ati	
  267 FF      50   -  90  0.0 S    irq/7-parport0	
  293 FF      50   -  90  0.0 S    irq/22-firewire	
  330 FF      50   -  90  0.0 S    irq/18-nouveau	
  588 FF      50   -  90  0.0 S    irq/43-eth0	
    3 FF       1   -  41  0.0 S    ksoftirqd/0	
   11 FF       1   -  41  0.0 S    ksoftirqd/1

[spinymouse at archlinux ~]$ jackd --sync -Xalsarawmidi -dalsa -r48000
-p256
jackdmp 1.9.8

[spinymouse at archlinux ~]$ jack_midi_latency_test -m 3 -s 8192 -t 5
"system:1-1 HDSPMx579bcc MIDI 1 1 out" "system:1-1 HDSPMx579bcc MIDI 1 1
in"

Reported out-port latency: 5.33-5.33 ms (256-256 frames)
Reported in-port latency: 5.33-5.33 ms (256-256 frames)
Average latency: 11.69 ms (560.52 frames)
Lowest latency: 11.65 ms (559 frames)
Highest latency: 11.76 ms (564 frames)
Peak MIDI jitter: 0.10 ms (5 frames)
Average MIDI jitter: 0.02 ms (0.04 frames)

Jitter Plot:
0.0 - 0.1 ms: 8189
     > 10 ms: 3

Latency Plot:
11.6 - 11.7 ms: 7906
11.7 - 11.8 ms: 283
     > 21.6 ms: 3

Messages sent: 8192
Messages received: 8192
Xruns: 3

[spinymouse at archlinux ~]$ jack_midi_latency_test -m 3 -s 8192 -t 5
"system:2-1 TerraTec EWX24/96 MIDI 1 out" "system:2-1 TerraTec EWX24/96
MIDI 1 in"
Waiting for connections ...
Waiting for test completion ...

Reported out-port latency: 5.33-5.33 ms (256-256 frames)
Reported in-port latency: 5.33-5.33 ms (256-256 frames)
Average latency: 11.69 ms (561.05 frames)
Lowest latency: 11.40 ms (547 frames)
Highest latency: 11.76 ms (564 frames)
Peak MIDI jitter: 0.35 ms (17 frames)
Average MIDI jitter: 0.00 ms (0.04 frames)

Jitter Plot:
0.0 - 0.1 ms: 8191
0.2 - 0.3 ms: 1

Latency Plot:
11.4 - 11.5 ms: 1
11.6 - 11.7 ms: 7704
11.7 - 11.8 ms: 487

Messages sent: 8192
Messages received: 8192