Kernel-rt issues solved, but configuring X still is a PITA

Mon Dec 27 21:37:34 GMT 2010

Hi :)

I build a kernel-rt for an upgraded Ubuntu Studio 10.04 Lucid, testing a
knack still to get an initrd, when building it by make-kpkg. This mail
is on HTML to enable copy and paste.

SOLVED

I now can build an initrd for self build kernels.
I now can start a kernel-rt from the repositories.

NEW AND UNSOLVED ISSUE

The monitor resolution for the GDM login menu is 'broken'.

### Preparing to build the kernel

$ cd /usr/src
$ ls linux -l
lrwxrwxrwx 1 spinymouse src 19 2010-10-03 02:39 linux ->
linux-2.6.33.7-rt29
$ rm linux
$ ln -s linux-2.6.33.7.2-rt30 linux
$ wget ftp://ftp.kernel.org/pub/linux/kernel/v2.6/linux-2.6.33.7.tar.bz2
http://www.kernel.org/pub/linux/kernel/projects/rt/patch-2.6.33.7.2-rt30.bz2

### Extracting the sources and patching the kernel

$ tar xjf linux-2.6.33.7.tar.bz2
$ rm linux-2.6.33.7.tar.bz2
$ mv linux-2.6.33.7 linux-2.6.33.7.2-rt30
$ cd linux
$ bunzip2 ../patch-2.6.33.7.2-rt30.bz2
$ patch -p1 < ../patch-2.6.33.7.2-rt30
$ rm ../patch-2.6.33.7.2-rt30

### Editing a configuration

$ uname -a
Linux ubuntu 2.6.32-27-preempt #49-Ubuntu SMP PREEMPT Thu Dec 2 03:21:34
UTC 2010 x86_64 GNU/Linux
$ cp /boot/config-$(uname -r) .config
$ make oldconfig
Pushing enter only.

### Disabling staging, without testing if it's needed to to disable it
for building the current kernel

$ gedit .config
Editing
CONFIG_STAGING=y
to
# CONFIG_STAGING is not set
$ make oldconfig
Nothing to do.

### Building the kernel

$ make-kpkg clean
$ export CONCURRENCY_LEVEL=2
$ make-kpkg --rootcmd fakeroot --initrd kernel-image kernel-headers
kernel-source

### Unfortunately there wasn't enough free disk space when I first build
the kernel.

OT: Btw. is there a list of apps that can be removed from Ubuntu Studio,
without getting issues? I e.g. don't need AppAmor, Firewalls etc. and
especially I would like to get rid of PulseAudio. [End OT]

### After removing some old kernel stuff and the already new build image
and headers, I build the kernel again, but I guess it would have been
ok, if I just would have installed the image and headers, because only
the unneeded source was missing. I also think,  that not running
'make-kpkg clean' again, would have made the repeated compiling faster,
but I dunno.

$ rm -r ../*rt29*
$ rm ../linux-h* ../linux-i*
$ make-kpkg clean
$ echo $CONCURRENCY_LEVEL
2
$ make-kpkg --rootcmd fakeroot --initrd kernel-image kernel-headers
kernel-source
$ sudo dpkg
-i ../linux-image-2.6.33.7.2-rt30_2.6.33.7.2-rt30-10.00.Custom_amd64.deb
$ ls -hAl /boot
total 21M
-rw-r--r-- 1 root root 632K 2010-12-02 07:02 abi-2.6.32-27-preempt
-rw-r--r-- 1 root root 109K 2010-12-02 07:02 config-2.6.32-27-preempt
-rw-r--r-- 1 root root 108K 2010-12-27 18:47 config-2.6.33.7.2-rt30
drwxr-xr-x 3 root root  12K 2010-12-27 20:07 grub
-rw-r--r-- 1 root root 8.0M 2010-12-27 09:28
initrd.img-2.6.32-27-preempt
-rw-r--r-- 1 root root 157K 2010-03-23 10:40 memtest86+.bin
-rw-r--r-- 1 root root 2.1M 2010-12-02 07:02
System.map-2.6.32-27-preempt
-rw-r--r-- 1 root root 2.1M 2010-12-27 19:52 System.map-2.6.33.7.2-rt30
-rw-r--r-- 1 root root 1.4K 2010-12-02 07:08
vmcoreinfo-2.6.32-27-preempt
-rw-r--r-- 1 root root 4.0M 2010-12-02 07:02 vmlinuz-2.6.32-27-preempt
-rw-r--r-- 1 root root 4.0M 2010-12-27 19:52 vmlinuz-2.6.33.7.2-rt30

### The knack

$ sudo update-initramfs -c -k 2.6.33.7.2-rt30

FWIW it took 77 minutes + less but 48 seconds on my machine to compile
the kernel and 5.45 GiB to build and install  the kernel + initrd.

$ ls -hAl /boot
total 30M
-rw-r--r-- 1 root root 632K 2010-12-02 07:02 abi-2.6.32-27-preempt
-rw-r--r-- 1 root root 109K 2010-12-02 07:02 config-2.6.32-27-preempt
-rw-r--r-- 1 root root 108K 2010-12-27 18:47 config-2.6.33.7.2-rt30
drwxr-xr-x 3 root root  12K 2010-12-27 20:07 grub
-rw-r--r-- 1 root root 8.0M 2010-12-27 09:28
initrd.img-2.6.32-27-preempt
-rw-r--r-- 1 root root 8.2M 2010-12-27 20:12 initrd.img-2.6.33.7.2-rt30
-rw-r--r-- 1 root root 157K 2010-03-23 10:40 memtest86+.bin
-rw-r--r-- 1 root root 2.1M 2010-12-02 07:02
System.map-2.6.32-27-preempt
-rw-r--r-- 1 root root 2.1M 2010-12-27 19:52 System.map-2.6.33.7.2-rt30
-rw-r--r-- 1 root root 1.4K 2010-12-02 07:08
vmcoreinfo-2.6.32-27-preempt
-rw-r--r-- 1 root root 4.0M 2010-12-02 07:02 vmlinuz-2.6.32-27-preempt
-rw-r--r-- 1 root root 4.0M 2010-12-27 19:52 vmlinuz-2.6.33.7.2-rt30

It's needed to add the initrd line to /boot/grub/grub.cfg. Startup
stopped, when I tried 'sudo startx' in tty1 I got 'Module nouveau not
found'. Because of a missing xorg.conf I copied the xorg.conf from my 64
Studio 3.0. I didn't test 'sudo gdm start', but I needed nothing to do
for launching X after I copied the xorg.conf.

$ sudo cp /media/studio3.0/etc/X11/xorg.conf /etc/X11/xorg.conf
Additionally I needed to set up the monitor preferences by the GUI to
the wanted resolution, unfortunately it's only ok for the desktop, but
not für the GDM login menu. For 64 Studio 3.0 Hardy it's the same, while
for 3.3 Lucid and Suse 11.2 it's ok.  Architecture for all installs is
64bit. I remember that it's possible to change this behaviour, that's
also annoying for e.g. tiling and tabbing window manager that don't
support such GUIs. Does anybody know how to change the default
resolution for the GDM login menu too?

Today I don't like to test what will happen when I remove the virtual
screen from xorg.conf or if I'll find a solution by using search
engines.

$ cat /etc/X11/xorg.conf
Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "de"
Option "XkbVariant" "ro"
Option "XkbOptions" "lv3:ralt_switch"
EndSection

Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
EndSection

Section "Device"
Identifier "Configured Video Device"
Boardname "GeForce 7300 SE"
       #Busid "PCI:1:5:0"
Driver "nv"
Screen 0
Option "MergedFB" "off"
EndSection

Section "Monitor"
  DisplaySize  305 230
  HorizSync    29-98
  Identifier "Configured Monitor"
  Modelname "Plug 'n' Play"
  Vendorname "Plug 'n' Play"
  VertRefresh  50-120
  modeline "1152x864" 128.42 1152 1232 1360 1568 864 865 868 910
  Gamma 1.0
EndSection

Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
Defaultdepth 24
SubSection "Display"
Depth 24
Modes      "1152x864"
                Virtual    3840 1200
EndSubSection
EndSection

Section "ServerLayout"
Identifier "Default Layout"
  screen 0 "Default Screen" 0 0
EndSection
Section "Module"
Load "glx"
#Load "GLcore"
#Load "v4l"
EndSection
Section "ServerFlags"
EndSection

On my machine currently are running 

1.1 Ubuntu Studio 10.04, Kernel 2.6.32-27-preempt, from the repositories
obviously using nouveau as driver for X by default.
2.1 openSUSE 11.2,       Kernel 2.6.31.6-rt19, self build and using the
proprietary nvidia driver.
3.1 64 Studio 3.3 alpha, Kernel 2.6.31-2-multimedia-amd64, from the
repositories, it's a PREEMPT RT kernel, also using the proprietary
nvidia driver.
4.1 64 Studio 3.0-beta3, kernel 2.6.31.12-rt20
4.2 64 Studio 3.0-beta3, kernel 2.6.31.6-rt19
4.3 64 Studio 3.0-beta3, kernel 2.6.31.5-rt18
4.4 64 Studio 3.0-beta3, kernel 2.6.29-1-multimedia-amd64

64 Studio 3.0 is ok with the self build kernels-rt and the multimedia
PREEMPT RT from the repositories using the FLOSS nv driver.
64 Studio 3.0 is based on Ubuntu Hardy and 3.3 on Ubuntu Lucid too. 

As a test I installed the package 'linux-kernel-rt', currently it will
install 2.6.31-11-rt. Now I can run the kernel-rt from the repository
too, unfortunately still with the GDM login menu issue too.

I need a solution for the 'nv' driver and I also will check out the
'nvidia' driver, while the issue shouldn't be solved just by using the
proprietary driver ;).

Any hints are welcome.

Cheers!

Ralf
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