I did what I posted a few posts back - just run the three commands:
1. chmod -R 705 /sys/kernel/debug
2. chown -R usrname:usrname /sys/kernel/debug/vgaswitcheroo (replace 'usrname' with your username)
3. echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
First thing - make sure you run all those with sudo - the chown and chmod commands need root access.
Second - For easy running, i created a bash script that runs those three commands all at once. Here is what my script contains:
notify-send "Disabling ATI GPU"
chmod -R 705 /sys/kernel/debug
notify-send "chmod - rdy"
chown -R emo:emo /sys/kernel/debug/vgaswitcheroo
notify-send "chown - rdy"
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
Where 'emo' is my name, you should replace it with your username.
What it does is running each command one after another and displaying a notification to see what is going on(you can change those, or remove them alltogether:))
paste this into an empty file and save it as something.sh(in my case I named it gpu.sh) and put it in your home folder.
Then when you start ubuntu, just type 'sudo sh gpu.sh' in the terminal and wait a couple of seconds.
To check if it is working okay, install the lm-sensors package(sudo apt-get install lm-sensors). After it is installed, type 'sensors' in the terminal. For me, when the discrete gpu is disabled, the output of 'sensors' ends in something like that:
Adapter: PCI adapter
Look at the last line - temp1: -128C. When I run sensors before disabling the radeon gpu, temp1 shows a real temperature reading - 30-40C. After I disable it, look like the sensors stops working and shows -128 degrees. That's how i check if it's working.
The rc.local autostarting is optional and I read it in the ubuntu forums but I haven't done it yet because I'm fine with running the script at startup.
I should say that after about a month of using ubuntu like that, I'm very happy with it. The fan runs sometimes, but by far not that often to be annoying, the temperature readings are great and if I put the laptop on my cooling pad, the fan is not working 99% of the time.
Battery lasts for about 4-4.5 hrs normal usage. Not as good as with windows, but still good enough for me.
Hope this works
ps. I did all that on ubuntu 12.04 at first and it worked perfectly fine. I've now installed the 13.04 beta 2(which is surprisingly stable and snappy btw) and it still works great.
any other solution, i have the same problem, and i tried many of version of ubuntu, opensuse, and fan still make noise.
it is stable only on windows, i want to know the drivers that you have installed both for intel and ati.
Hi I use 3521 inspiron. Intel 2117u Cpu. No discrete graphics card. The laptop's fan works constantly.
Only an integrated card in laptop (HD Graphics 2500).
Is there any solution? The factory-installed ubuntu no on the disk.
Is there any difference between the pre-installed ubuntu and 12.04 ubuntu?
The pre-installed system can obtain a copy somewhere?
With the pre-installed ubuntu is constantly spinning the fan?
Or a list of drivers. Dell uses to the pre-installation.
(package name list)
Thank you in advance for your help.
Hello I am the owner of Dell Inspiron 3521-8898, tell me where I can download the original image of ubuntu? my service tag 5HH91X1, and tell me why when I configure hdmi output at 1920x1080 resolution and the signal disappears when install 1366x768 hdmi port works fine