Thank you for the helpful feedback. From research on KMS I've gleaned some ideas for the display problems we've seen.
From https://publictest6.fedoraproject.org/wiki/Xorg/KMS
Sometimes allowing the kernel to manage the video outputs causes a boot to blank (black) screen. I thought our kernel 2.6.33.2 (from Quirky) had KMS disabled, but I found a kernel module drm_kms_helper in /lib/modules/2.6.33.2/kernel/drivers/gpu/drm/ so I suspect it is still active. (If you want to know what kernel modules your display driver might use, that directory is one place to look. Another is Menu | System | Hardinfo | Kernel Modules.) The kernel 2.6.30.5 in LHP 4.43 does not have drm_kms_helper.KMS stands for Kernel ModeSetting. That means the kernel is responsible for switching video modes and managing the video outputs (this was previously handled by Xorg).
KMS enabled hardware
Most AMD/Radeons (from R100 to R500 on Fedora 11). Most Intel hardware as well.
So here's how to disable/configure KMS in LHP 5.00: from the LiveCD boot menu enter:
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puppy pfix=ram xforcevesa nomodeset
If the above doesn't help try:
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puppy pfix=ram xforcevesa nomodeset acpi=off
Intel graphics: instead of nomodeset try: i915.modeset=1 or i915.modeset=0
ATI Radeon: radeon.modeset=0
nVidia: nouveau.modeset=0
Tip: If you know which kernel module your display card is using, you can find the available kernel parms by typing modinfo <kernel_module_name> in a terminal. So for nVidia you'd type modinfo nouveau. (The Xorg driver for nVidia is nv but the kernel module is nouveau. For Intel, the i810 driver is now intel and the kernel modules are i810, i830 and i915.)
If any of this is helpful for Lighthouse 5.00, please let me know specifically what works, and I'll place it on the first post and the web site.
[Edit 2010.06.22: Feedback indicates puppy xforcevesa nomodeset usually works for LHP 5.00. LHP 5.00B and later ISOs include this by default.
According to ICPUG, With Intel855 use the kernel parameter i915.modeset=1 and either auto-configure Xorg (option 1 in xorgwizard) or choose option 2 and select the intel driver.
-TazOC