Compaq Presario CQ62 Wireless Problem
Problems that usually occur is system (network manager) can't browse available access point, regarding to this problem you can solve by adding wireless connection manually using the correct access point name and wireless security key. Other way, you can search access point trough terminal using
iwconfig or iwlist, see the exemple bellow.
$ iwconfig eth1
the result should be like this
eth1 IEEE 802.11g ESSID:"OSU_PUB"
Mode:Managed Frequency:2.427 GHz Access Point: 00:0D:9D:C6:38:2D
Bit Rate=48 Mb/s Tx-Power=20 dBm Sensitivity=8/0
Retry limit:7 RTS thr:off Fragment thr:off
Link Quality=91/100 Signal level=-39 dBm Noise level=-87 dBm
Rx invalid nwid:0 Rx invalid crypt:860 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:39 Missed beacon:8
the bold line above (OSU_PUB) is exactly the name of access point, complate guide how to add wireless access point by manual through terminal can be complately find in here.
Compaq Presario CQ62 No Sound
The common problem is laptop no sound or if the speakers are not working but the headphones are, you can follow the instruction bellow, do with command line :
sudo add-apt-repository ppa:ubuntu-audio-dev/ppa
sudo apt-get update
Install the linux-alsa-driver-modules package
sudo apt-get install linux-alsa-driver-modules-$(uname -r)
Backlight Brightness Control not working
Some of compaq presario have experience with this problem, foremost laptops that running Ubuntu under 10.10 (Maverick Meerkat), we got a lot of answers in a forum but sometime not work properly. the main problem is the GNOME itself, you can fix it by re-installing GNOME or try to install new version of your distro (Ubuntu 11.04 maybe), other way we have tricky solution that usually work, do with command line under #root.
echo -n 50 > /proc/acpi/video/VGA/LCD/brightness
50 is percentage of brightness, you can replace the 50 with: 37 12 25 37 50 62 75 87 or 100. After doing some action above, don't forget to reboot your laptop and your problems should be solved after that (i hope so).