Comment 36 for bug 22976

I have to retract my previous post. I did manage to destroy one and a half CRT iMacs but it was not at all Ubuntu-related. The good folks at FreeGeek confirmed for me that they never see these problems.

What explains my explosions I think is the accumulation of dust on a coil related to the CRT. The dust causes the coil to conduct where it should not, and it heats up and eventually shorts out.

I saved the second iMac by opening it up and thoroughly dusting it out with an air duster. It now runs without any overheating or display glitches.

As a humble karmic offering for my over-reaction allow me to offer these ModeLine entries which when added to /etc/X11/xorg.conf give Feisty Fawn the ability to change monitor resolutions using System/Settings/Screen Resolution on a slot-loading iMac:

---<begin>---
#(**) ATI(0): *Mode "1024x768": 78.5 MHz, 59.8 kHz, 74.8 Hz
Modeline "1024x768" 78.50 1024 1033 1129 1312 768 769 772 800 +hsync +vsync
# (**) ATI(0): *Mode "800x600": 62.4 MHz, 60.0 kHz, 94.9 Hz
Modeline "800x600" 62.40 800 825 905 1040 600 601 604 632 +hsync +vsync
# (**) ATI(0): *Mode "640x480": 49.9 MHz, 60.0 kHz, 116.7 Hz
Modeline "640x480" 49.90 640 653 717 832 480 481 484 514 +hsync +vsync
# (**) ATI(0): Default mode "512x384": 39.4 MHz, 60.1 kHz, 75.1 Hz (D)
Modeline "512x384" 39.40 512 520 568 656 384 384 386 400 doublescan +hsync +vsync
---<end>---

Add those to Section "Monitor" and you are good to go.

cheers,
  James