[Openchrome-users] Problems with VIA VT3344 (VM800)

[Zeus Gómez Marmolejo]

Hi!!

I recently purchased a VIA Epia EN1200EG Mainboard with chipset VIA  
VT8237R South Bridge and UniChrome Pro IGP integrated graphics  
controller.

I have been working some days to make the graphics controller work  
under Gentoo Linux and I suceeded with the VGA monitor attached (a  
Samsung SyncMaster 710MP) with the openchrome svn tree (version 328).

The main problem have been in connecting my second monitor into the  
DVI daughterboard connector. I have a Dell 3007WFP (this huge 30"  
monitor) and it has a native resolution of 2560x1600. Although I won't  
use this resolution, it can also work in 1280x800 mode (the half of  
the first mode). It only works in this two modes because it lacks a  
graphics processor.

Anyway, when starting Xorg 7.2 with the "via" driver forcing the  
modeline with the monitor (from DDC):

Modeline  "1280x800" 71.0 1280 1352 1488 1696 800 801 804 832

the driver reports:
...
(--) VIA(0): Detected VIA VT3344 (VM800) - EPIA EN.
...
(II) VIA(0): Not using mode "1280x800" (hsync out of range)

I suceeded to use this monitor with the "fbdev" driver, using vesa  
mode 0x1b8 (1280x800-32bpp)... I'm already booting linux with the vesa  
framebuffer driver in this mode. But with this driver in Xorg I can't  
play movies and everything is really slow.

When starting with the "fbdev" driver, the logfile reports this:

(--) FBDEV(0): Virtual size is 1280x800 (pitch 1280)
(**) FBDEV(0):  Default mode "1280x1024": 108.0 MHz (scaled from 0.0  
MHz), 64.0 kHz, 60.0 Hz
(II) FBDEV(0): Modeline "1280x1024"  108.00  1280 1328 1440 1688  1024  
1025 1028 1066 +hsync +vsync

But using this modeline with the "via" openchrome driver fails.

I'd really like to solve this problem. I'm even thinking about to dive  
into the sources to know why the framebuffer driver can use perfeclty  
this monitor and the openchrome driver not...

Any help would be really appreciated. Thank you very much!!


Zeus.