monitor goes to sleep while install RHEL 5.1

[Rick Stevens]

Dennis D. Calhoun wrote:
> Chris Henderson wrote:
>> When I try to install RHEL 5.1, I get "input signal out of range" and
>> the monitor goes to sleep. When booting off the install DVD, I execute
>> "linux resolution 1280x1024" from the command prompt (without the
>> quote) - but this doesn't help and the monitor still goes to sleep.
> 
> Rick Stevens wrote:
> It's not a resolution issue, it's a screensaver.  You might try adding
> "acpi=none" on the boot command line during the installation to disable
> the power saving options.
> 
> Screensaver? In my experience, "input signal out of range" usually indicates
> a mismatch between the monitor's needed "refresh rate" and that being made
> available by the OS and/or graphics card.

Not always.  A lot of monitors do that when the video card drops the
VSYNC or HSYNC lines trying to put the monitor to sleep.
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