Linux on Dell Latitude D820

Updates

• 08 Dec 2006 General update of the Howto after switching to Ubuntu Edgy Eft. Removed BIOS-corrupting warning because it seems to be fixed (Either in the newest kernel or in one of the Dell BIOS updates (I have A04), don't know)

Dell Latitude D820 details

Processor	Intel® Core™ Duo T2400 1.83 GHz	Works
Memory	2 GB RAM	Works
Harddisk	100 GB Hitachi HTS72101 ATA Drive	Works
DVD/CD-ROM	TSSTcorp DVD+-RW TS-L632D	Works
Videocard	512 MB NVidia® Quadro NVS 120M TurboCache™	Works
TFT display	1280x800	Works
Soundcard	Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller	Works, but has some problems
USB	Intel Corporation 82801G (ICH7 Family)	Works
Firewire	O2 Micro	Works
Network	Broadcom Corporation NetXtreme BCM5752 Gigabit Ethernet PCI Express	Works
WLAN	Intel® Pro/Wireless 3945ABG	Works
Touchpad	Synaptics TouchPad	Works
PCMCIA	O2 Micro	Works
Special buttons	Mute volume, Increase volume, Decrease volume	Works
ACPI		Works but has suspend problems
Smart card reader	O2 Micro Oz776	Works
IrDA	SIR at /dev/ttyS1	Works

Used setup

I'm using Ubuntu Edgy Eft which comes with a 2.6.17 kernel. After the installation pretty much is working right out of the box. Some stuff needs some tweaking as described below.

Output of lspci

If you are interested in the output of lspci, here it is.

Processor

The two cores of the processor are working out of the box. Speed Step is also working fine with 1 GHz, 1.33 Ghz and 1.83 Ghz.

I had problems with Half-Life (via Cedega). I've solved them by disabling the second CPU and switching off speed step before I start the game. This can be done by executing the following commands as root before starting Cedega:

echo 0 > /sys/devices/system/cpu/cpu1/online
echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

After closing Cedega you should run these commands as root to get the system back to normal:

echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo 1 > /sys/devices/system/cpu/cpu1/online

By using sudo all this can be put into some scripts so cedega can be started easily without bothering about technical details. Here is a step by step instruction how to do it (I assume you have installed Cedega as Debian package. If not, then you have to figure out the differences yourself):

• Run dpkg-divert --add /usr/bin/cedega and rename /usr/bin/cedega to /usr/bin/cedega.distrib. This ensures that Debian always installs the cedega binary to cedega.distrib.
• Download setgovernor, put it into /usr/local/bin and make it executable. This script is responsible for switching the frequency governor.
• Download setcpu2, put it into /usr/local/bin and make it executable. This script is responsible for enabling and disabling the second CPU.
• Download cedega, put it into /usr/bin and make it executable. This script replaces the original cedega binary which you have diverted to cedega.distrib in the first step. The script calls the other two scripts before and after running the original cedega. It also runs cedega with highest process priority to solve some schedular issues with kernel 2.6.
• Install sudo and put this into /etc/sudoers (Replace your-user-name with your user name):

  your-user-name ALL=(root) NOPASSWD: /usr/local/bin/setgovernor
  your-user-name ALL=(root) NOPASSWD: /usr/local/bin/setcpu2

  This allows your user to run the setgovernor and setcpu2 scripts as root without entering a password.

I noticed another problem. This time with VMware. The clock of the guest operating system is running much to slow. This can be solved by reducing the maximum C-State of the processor with this command:

echo 1 > /sys/module/processor/parameters/max_cstate

After you are finished with Vmware you can reset the setting to save battery power with this command:

echo 8 > /sys/module/processor/parameters/max_cstate

You may put these commands into a script and run it with sudo like the other scripts described above.

Video card

The open source Xserver nv runs fine in 2D mode but I've upgraded immediately to the latest beta binary driver from Nvidia (version 97.42) to get 3D acceleration and TwinView.. This is my first contact with NVidia hardware. All my former laptops had ATI chipsets. It took a long time until a had TwinView running perfectly but when it's configured properly (Thanks to the great documentation) it's working like a charm. Here is the crucial part of my xorg.conf:

Section "Device"
    Identifier "Generic Video Card"
    Driver     "nvidia"
    BusID      "PCI:1:0:0"
    Option     "NoLogo"                    "true"
    Option     "ConnectedMonitor"          "DFP-0, CRT-0"
    Option     "UseDisplayDevice"          "DFP-0, CRT-0"
    Option     "UseEdidFreqs"              "false"
    Option     "UseEDID"                   "true"
    Option     "TwinView"                  "true"
    Option     "TwinViewOrientation"       "LeftOf"
    Option     "SecondMonitorHorizSync"    "30-160"
    Option     "SecondMonitorVertRefresh"  "30-85"
    Option     "MetaModes"                 "DFP-0:1280x800,CRT-0:1280x1024; DFP-0:1280x800,
CRT-0:NULL; DFP-0:1024x768,CRT-0:NULL; DFP-0:800x600,CRT-0:NULL; DFP-0:640x480,CRT-0:NULL"
    Option     "TwinViewXineramaInfoOrder" "DFP-0, CRT-0"
    Option     "DPI"                       "75 x 75"
    Option     "UseEdidDpi"                "false"
    Option     "FlatPanelProperties"       "Scaling = Centered, Dithering = Default"
    Option     "AddARGBGLXVisuals"         "true"
    Option     "TripleBuffer"              "true"
EndSection

With these settings I'm able to switch between Single-Head and Dual-Head with the xrandr program and it doesn't matter if the external display is connected or not.

Soundcard

Works with the ALSA driver snd_hda_intel but has some problems. A major problem is that the mixer capabilities are very limited. I can just control Master, PCM, Capture Mux and Capture. There is no mixer setting for the internal PC speaker which is quite annoying because it beeps very loud. I have disabled the bell in bash by putting the line set bell-style none into the file ~/.inputrc and also disabled it in gnome but sometimes it's still triggered by some programs. If you have a solution for this, let me know.

I had another problem with sound in Quake 3 but solved them by executing these commands as root before I start the game:

echo "quake3.x86 0 0 direct" > /proc/asound/card0/pcm0p/oss
echo "quake3.x86 0 0 disable" > /proc/asound/card0/pcm0c/oss

Similar to the Cedega solution described above in the processor section I have created a alsafix script and a quake3 script. Put both into /usr/local/bin, make both scripts executable, edit the quake3 script and change the path to your real quake3 binary and then make sure your user can execute the alsafix script with sudo without entering a password. Then you can just run the quake3 script and quake starts up with working sound.

A more serious problem I have with timidity and games like FlightGear. The sound makes small breaks multiple times per second. The only solution to improve the sound quality (but it's still not perfect) I have found so far is disabling the second CPU core and setting the first CPU core to full power. If you know a better solution, please let me know!

Firewire

I don't have any firewire devices but the output in the kernel log file looks like the driver was loaded correctly.

Network

The intergrated network controller is working out of the box with the tg3 driver.

WLAN

The wireless network card is detected by Ubuntu and works out of the box with the shipped open source ipw3945 driver.

Touchpad

The touchpad worked out of the box but mouse pointer movement was pretty slow. The mouse settings in Ubuntu doesn't affect the touch pad. They affect only the track point. So I added the following lines to the touchpad section in xorg.conf to accelerate the mouse pointer movement

Option         "MinSpeed"    "0.7"
Option         "MaxSpeed"    "3"
Option         "AccelFactor" "0.025"

If you want to be able to configure the touchpad with qsynaptics then you may want to add this option:

Option         "SHMConfig" "1"

If you are like me and don't like the scroll area on the touch pad then you can disable it with this option:

Option         "VertScrollDelta" "0"

PCMCIA

PCMCIA works fine out of the box with the yenta driver. Because the laptop has integrated WLAN I don't need PCMCIA but I have tested it by inserting my old Orinocco WLAN card. It was detected and powered up correctly.

Volume buttons

The volume buttons are working right out of the box. They are handled by software (Gnome in my case). That means that they are not always working when you are in a game like Quake or Half-Life.

ACPI

ACPI support works fine. The battery state and CPU temperature can be read without any problems. But as usual suspend-to-ram has problems. I'm currently not sure what causes it. The laptop does not go to sleep, instead it freezes after some time. I have not investigated this problem yet. If you have some tips, please let me know.

Smart card reader

The smart card reader seems to work. The program pcsc_scan (included in the package pcsc-tools) detects the reader and recognizes my cash card. But I have no need for a smart card reader so I have not tested further. You also need to install the package pcscd and you have to set the driver option DRIVER_OPTION_USE_BOGUS_FIRMWARE in the file /etc/libccid_Info.plist (Restart pcscd after changing the file):

<key>ifdDriverOptions</key>
<string>0x0004</string>

IrDA

IRDA does not work out of the box because the /etc/init.d/irda-setup script of the irda-utils package shipped with Ubuntu thinks it has to load the smsc-ircc2 FIR driver which fails. I have modified this script so it looks like this (changes in bold):

IBM0071)
FIR="nsc-ircc";
OPTIONS="dongle_id=0x09";
;;
SMCf010*)
SIR="true"
;;
SMC*)
FIR="smsc-ircc2";
;;

After this change and restarting all the IrDA stuff irdadump recognized my Siemens mobile phone and scmxx --device=/dev/ircomm0 -i correctly connected to the phone and listed lots of information.