TeeJee's Tech Blog

Fix problems with Ubuntu on Dell Studio 1555

2009-12-01T01:26:00.000-08:00

Problems with video playback (Compiz + ATI graphics card)

Problem:

Playing a video with Totem, VLC or MPlayer gives a black screen
Switching to fullscreen causes a crash
The video stutters or freezes on fullscreen playback

Cause:
The problem is with Compiz and with the proprietary ATI graphics driver (fglrx). You will see many solutions which tell you to either disable compiz or use the xv or x11 video driver. This solution is what I was using till now. The disadvantage of using the X11 video output is that the playback will be poor (stutter, freeze, etc) and hardware acceleration is not used for video playback.

Solution:

Install the compizconfig-settings-manager package using Synaptic.
Open CompizConfig Settings Manager from System -> Preferences.
Select General from the left panel and General Options from the right panel.
There's an option called Undirect Fullscreen Windows. Check this option.

This will fix all your video playback problems!

TIP: If you are using SMPlayer please note that the spacebar is used for pause only! It is not used to toggle between Play/Pause! You can change the default keyboard mapping from the Options->Preferences window.

Problems with LCD brightness
Problem:

The media keys for adjusting LCD brightness sometimes work and sometimes don't.

Solution:

Open /etc/default/grub using GEdit.
Find the line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" change it to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash noapic"
Save the file and close GEdit
Open a terminal and type update-grub.
Reboot.

Thats it. The media keys for adjusting LCD brightness should work correctly now.

Calibrate your LCD

It is very important to calibrate your LCD display in order to get good color reproduction and contrast. These settings can be adjusted from the Catalyst Control Center (colors tab). The settings that I am using are given below. These settings are very easy on the eyes and give good results.

Gamma = 1.40
Brightness = 0 (default)
Contrast = 70
Hue = 0 (default)

Adjust the LCD brightness using the media keys after calibrating your LCD.

If your hardware is different then these values may not give good results with your LCD. The following sites have some good tools for calibrating your LCD or monitor.
http://www.displaycalibration.com/brightness_contrast.html
http://www.photoscientia.co.uk/Gamma.htm

Add GRUB2 Splash Image in Ubuntu

2009-11-04T20:35:00.000-08:00

One of the major highlights in Ubuntu 9.10(Karmic Koala) its the new GRUB2 boot loader which allows high-resolution images to be used as backgrounds in the boot screen. However, after installing Karmic you will realise that the background image is disabled by default and what you get is a simple black background.

Installing a splash image for GRUB2 is very simple. All you have to do is follow the steps given below:

1) Download the images

Open a command window, copy-paste the following text and press Enter:


sudo apt-get install grub2-splashimages

This will install a number of images (in TGA format) in the /usr/share/images/grub folder. Open this folder to view the images you downloaded.

2) Install a splash image

Lets install Lake_mapourika_NZ.tga as the splash image.

Type the following in a command window:


sudo gedit /etc/grub.d/05_debian_theme

This will open up the file /etc/grub.d/05_debian_theme in gedit text editor with root priviledges.

Find the line:


for i in {/boot/grub,/usr/share/images/desktop-base}/moreblue-orbit-grub.{png,tga} ; do

Replace it with:


for i in {/boot/grub,/usr/share/images/desktop-base,/usr/share/images/grub}/Lake_mapourika_NZ.{png,tga} ; do

Save the file and exit.

Update your grub.cfg using the following command:


sudo update-grub

Thats it. Reboot your machine and enjoy the new boot screen.

Notes:

1) The line:


for i in {/boot/grub,/usr/share/images/desktop-base,/usr/share/images/grub}/Moraine_Lake_17092005.{png,tga} ;

tells grub to look for Moraine_Lake_17092005 (in PNG or TGA format) in the following locations:


/boot/grub
/usr/share/images/desktop-base
/usr/share/images/grub

You can use any image in PNG or TGA format as the splash image by simply copying the image to any of these folders and changing the line as described above. You can also specify some other folder of your choice. Always remember to run sudo update-grub after editing the line otherwise your changes will not be saved.

2) The images that you get by installing the grub2-splashimages package are extremely boring (screenshot below).

You can download a number of high-resolution wallpapers from the following site and use them as the splash image.

http://www.desktopnexus.com/tag/ubuntu/

3) The default resolution for the splash image is very low (640x480). If the image you use is larger than this then it will be cropped and the boot screen will look very ugly. You can increase the resolution to 1024x768 for better results.

Type the following in a command window:


$sudo gedit /etc/default/grub

This will open up the file /etc/default/grub in gedit text editor with root priviledges.

Find the line:


#GRUB_GFXMODE=640x480

Replace it with:


GRUB_GFXMODE=1024x768

Save the file and reboot.

4) Your graphics card supports a very limited number of video modes during boot time. Make sure that you are using a supported resolution. To see the video modes available at boot time, reboot your machine, press C at the boot screen and type vbeinfo

5) The syntax for editing the GRUB2 configuration files is given on the following page:

https://wiki.ubuntu.com/Grub2

How to update MPlayer in Ubuntu

2009-11-03T21:48:00.000-08:00

The MPlayer version that is available through the official Ubuntu repositories is very old (1.0 RC2, released in April 2008). When you run a program like SMPlayer, it will complain that the MPlayer version is very old and some of the features won’t work properly.

To update MPlayer to the latest version, open a command window, copy-paste the following text and press Enter:

sudo sh -c "echo 'deb http://ppa.launchpad.net/rvm/mplayer/ubuntu karmic main' >> /etc/apt/sources.list"
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 03E02400
sudo apt-get update
sudo apt-get install mplayer mencoder smplayer

Thats it! All the required packages will be downloaded and installed, and MPlayer will be updated to the latest version. To check the MPlayer version, open a command window and type mplayer.

Note:

The following repo is maintained by the SMPlayer developers and is regularly updated to include the latest MPlayer builds:

deb http://ppa.launchpad.net/rvm/mplayer/ubuntu karmic main

If you are using an older Ubuntu release then replace the word karmic with the corresponding nickname. For example, if you are using Ubuntu 9.04 (Jaunty Jackalope) then replace karmic with jaunty.

Useful tips for updating Ubuntu

2009-11-03T20:55:00.000-08:00

Now that Ubuntu 9.10 (Karmic Koala) has released I'm sure that many of you will be looking to update your existing Ubuntu systems to Karmic. Directly upgrading from the internet can take a lot of time and internet bandwidth, so many people prefer doing a fresh install by downloading the ISO or by ordering a CD. Having to again install all your favourite applications on your new system can be a nightmare. Here are some tips that will make your life easier.

1) Backup all files in /var/cache/apt

Whenever you install a new application, all packages are downloaded to this location. Simply copy all files and folders in this location to some other place, and copy them back again after installing the new version of Ubuntu. When you try to install the same applications again, the packages in this folder will be used by apt instead of re-downloading them. It will save a lot of time and internet bandwidth. Also useful for installing packages when you are not connected to the internet.

Note: If you are connected to the internet and newer versions are available, then the newer versions of these packages will be downloaded and used.

Note: Instead of doing this manually you can use an application called AptOnCD which will automatically burn these packages on a CD/DVD for you. Click here to install it.

2) Create an installation script

Creating an installation script is very easy. After installing a fresh copy of Ubuntu simply connect to the internet and run the script. All your favourite apps will be downloaded and installed automatically. For example, consider the following script:

sudo -i
apt-get install sun-java6-bin sun-java6-jre
apt-get install ubuntu-restricted-extras
apt-get install rar p7zip-full gnochm
apt-get install gparted cups-pdf sensors-applet aptoncd

Save it to a file named update.sh in your home folder and run it by typing the following in a command window:

sh update.sh

Initially it can take some time to identify the package names for all your favourite applications and to create the script. But once you create the script it will make your life a whole lot easier the next time you reinstall your OS.

Useful updates for Ubuntu

2009-11-03T06:37:00.000-08:00

This is a list of linux applications that I find very useful. To install any of these apps on your Ubuntu system simply click on the Install icon and click OK on the window that pops up (Works with Firefox only).

PDF Printer (cups-pdf)

This package installs a virtual printer that can be used to print any printable document into a PDF file. It is similar to doPDF and CutePDFWriter for windows.

INSTALL

Hardware Monitor (sensors-applet)

This package adds applets to the gnome panel which can display HDD, CPU and motherboard temperatures. It is similar to programs like HDDTemp and Motherboard Monitor for Windows.

Note: While installing this app you will be asked wether you want it to run automatically at startup. Select YES. After installation you will have to add this applet manually to the panel (right-click on the panel and click Add to panel).

HDD Temperature display in panel

INSTALL

Adobe PDF Reader v9.2

Adobe PDF Reader is available for Ubuntu as 60 MB .deb package. Simple click on the icon to download and install it. It will open with gDebi package manager by default.

INSTALL

Opera Web Browser v10

Opera web browser is available for Ubuntu as 11 MB .deb package. Simple click on the icon to download and install it. It will open with gDebi package manager by default.

INSTALL

Ubuntu Restricted Extras

Ubuntu restricted extras includes all those packages which are not included in the Ubuntu ISO due to licensing and other issues. This includes the following:

Adobe Flash Player plugin
Codecs for common audio and video files
DVD playback support
UnRAR plugin

INSTALL

Java Runtime Environment

Required for viewing Java enabled websites and running java applications.

INSTALL