Mythbuntu 8.04, updated
Gigabyte P35-DS3L mobo w/ Intel E8400
nVidia Quadro NVS 285 w/ DVI out (DVI -> HDMI cable)
latest proprietary nVidia driver
Sharp Aquos HDTV LC-52D64U
KSI IR keyboard, PS/2 (with Sony RM-VL900 learning remote)
HDHomeRun + PVR500
First off, I'd like to make the claim that the screensaver (screen blanker) or some part of the power saving features seems to be messing up some of my hardware, in the following ways:
1) When the screensaver comes on for a period, and I bring the system back to life, the keyboard system tends to become flaky or sometimes unresponsive. This is characterized by poor reception from the learning remote (or the keyboard), sometimes getting a "stuck key" which repeats at a high rate (because the receiver hasn't properly registered that I have lifted the key) or otherwise just misses most of my key presses. This only happens when it comes back from power save mode. (Note: it is not going to standby or hibernation.) On a fresh boot, I don't have these issues with the keyboard response.
2) It's possible the power-saving state is also messing up the dedicated ethernet link to the HDHR. (There's a second Ethernet port using a PCI slot that I've set up for this purpose.) I have DHCP set to give it a particular IP address et al, and it always works when I reboot the HDHR and the mythbox, but sometimes when it comes back from screensaver mode I don't get any response from the HDHR and the second-from-left green LED on the HDHR just blinks. I'm not 100% positive it's the screensaver/powersaver at fault, but I think so. I'm not sure exactly the mechanism, either.
So, what I'd really like to know is:
How do I shut off the screensaver and the other powersave features completely? As far as screen blanking is concerned, this feature is somewhat useless for me, as it doesn't reduce power consumption on the Sharp TV, it just turns the screen black. I suppose it could prevent burn-in on the LCD, but my wife and I are pretty good about turning the TV off when it's not in use. I really just want to kill the screensaver and any other power saving features (except perhaps CPU scaling, which should be fine) to prevent problems.
I've tried 2 things so far:
1) I used gnome-screensaver-settings to turn off the screensaver. It took the settings, but the screen blanking still continues after 10 minutes.
2) Based on the advice of another thread, I've tried the following lines at the end of xorg.conf
When these lines are used, the nvidia driver fails to load and I get some low-res default screen when it boots up, so it doesn't work at all.
Option "BlankTime" "0"
Option "StandbyTime" "0"
Option "SuspendTime" "0"
Option "OffTime" "0"
Option "ScreenBlank" "0"
Any help would be much appreciated.