I'm using Ubuntu 11.10 with the default video driver because with the proprietary one the animations/window moving/video play is laggy and slow. With the default driver everything is fine except that after a while there is a strange graphic glitch and the card itself is burning. I don't know the exact temperature but if I touch the card while using Windows it's normal but when I use Ubuntu it's burning (without any stress in both cases).
I have here a rather old Thinkpad with a Mobility Radeon HD 3400 series card, having similar problems:
My solution: - Use the open-source radeon-driver (accodring to the man-page your card is supported) and manually clock down the card: If it is not installed already, install it, the package is named 'xserver-xorg-video-radeon':
On the next start, X will automagically use the radeon driver. You can check this using 'lsmod | grep radon', you should see something like this:
ensure that the fglrx driver is not loaded, 'lsmod | grep fglrx' should produce no output.
Check if your card is running at the highest speed too: 'cat /sys/kernel/debug/dri/0/radeon_pm_info' shows you the clock-speed of your card
Set the power-profile to something more reasonable:
Now check again the clock-speed of your card:
It should show reduced clock-speeds and voltage.
That did the job for me. I'm now using gnome 3 for quite some time, things work very nice with Ubuntu. You might also be interested in this bug-report:
It seems like ATI is having serious problems in providing a decent working linux-driver.
Also note, that this problem of "Radeon driver is clocking the card too hot" started to appear on my system with the introduction of KMS. It seems like the card is never switched to a reasonable power-profile, even if it is getting too hot. Before KMS, I was able to use in Xorg.conf the options "dynamic clocks on" (or similar) and the card adjusted its speed properly.
ATM I'm just setting the power-profile to "mid" each time after booting (a script could do the job).
Hope this helps, cheers
Note, I forgot to mention one thing: If you have a system with switchable graphics (in my case a thinkpad T400 with a ati card and a ibm gfx-chip), you need to disable the 'switchable graphics' in the bios and manually set in the bios which card to use (Discrete graphics in my case to use the ati-card). If not, it might happen that both cards are "powered-up" and are running at top-speed, producing heat. Here is a lot of informations about this:
** Recommended actions when using an ATI 6900 series graphics card: **
1) Install the recommended drivers using the
2) Disable compiz effects using the Compiz Manager or select
I answered about this problem another post. Check out this.