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My video card and monitor were both detected successfully during the install. I set up X to use 1152xwhatever@16bit, and hit the "Test X setup" button. The Gnome test desktop came up without problems, and I hit the confirm button. When the installer came back to the installer screens, there were a lot of artifacts on the display, and the screen wouldn't update any more. Hitting "next" seemed to advance the installer, judging by disk access, but the screen stayed exactly the same. Upon rebooting and starting the installer again, the same garbled screen was there when X started, but was quickly replaced by the normal installer. Installation without testing X proceeded normally. The video card is a 3DFX Voodoo3-3000, 16MB.
Verified, Voodoo 3. One thing to add. I tried using 1400x1050 first, which did not give me a usable screen, so I pressed 'n' to tell the installer that it didn't work. When I did that, the "Test setting" button remained pressed and the interface became unresponsive, but I was still able to change the resolution and test again. When I accepted the result, the system hung. Ctrl-Alt-F1 wouldn't break out either.
Assigning for a developer.
Hmm. When you get to the syslinux prompt, try typing 'nofb'. This will force the installer to skip framebuffer mode altogether and start the graphical installer with whatever X server that card uses. I'm trying to figure out if this bug is related to framebuffer mode.
*** This bug has been marked as a duplicate of 22753 ***