Failure report with tridentfb, CyberBlade Ai1

I've got a laptop with a CyberBlade Ai1 chipset, and I decided to try the tridentfb because XFree86 4.1.0 does not support this video device decently.

Unfortunately, the fb driver doesn't do much better. I compiled it into the kernel, and the kernel started loading under text mode, but once the framebuffer driver loaded the screen's image turned into a scrambled picture of the boot screen. I could type blindly to log in and reboot, but the garbage on the screen was completely constant.

If you'd like more information or access to the machine, please let me know :). I really want to have a decent video driver on the system.

(utterly OT question because I'm too lazy to make two posts: is anyone working on agpgart support for the SiS 5591/5592 AGP chipset?)

Tridentfb VERSION 0.6.9, as distributed in 2.4.19-pre8-ac5.

01:00.0 VGA compatible controller: Trident Microsystems: Unknown device 8620 (rev 5d) (prog-if 00 [VGA])
Subsystem: Toshiba America Info Systems: Unknown device 0001
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 8
Interrupt: pin A routed to IRQ 11
Region 0: Memory at ff000000 (32-bit, non-prefetchable) [size=8M]
Region 1: Memory at fefe0000 (32-bit, non-prefetchable) [size=128K]
Region 2: Memory at fe000000 (32-bit, non-prefetchable) [size=8M]
Expansion ROM at <unassigned> [disabled] [size=64K]
Capabilities: <available only to root>