[Openchrome-users] Overscan and mode selection on CN700

[Daniel Lawson]

Hi all,

I have a via CN10000EG board with a CN700 graphics chip and am trying to use it with openchrome for PAL tv-out.? Primarily I want to be able to overscan to remove a big black border, but more generally I've noticed that some of the supposed supported modes are not available so I think this may be a more general problem with my setup.

The openchrome driver is the 0.2.904 from the downloads page, and xvmc etc are working, so the driver is at least mostly installed correctly.

My understanding, from much googling, is that the correct modelines are available in the driver and have to be selected by setting:
Modes?????"640x480Over"
in the screen/Display section of xorg.conf, where I currently have:
Modes?????"640x480"
However, if I use this setting I get "No screens found".? This is true for "720x576Over" and "720x576NoScale" as well.? Looking in /var/log/Xorg.log I see:

~$ grep "Over" /var/log/Xorg.0.log
(II) CHROME(0): Not using mode "800x600Over" (no mode of this name)
(II) CHROME(0): Not using mode "720x576Over" (no mode of this name)
(II) CHROME(0): Not using mode "640x480Over" (no mode of this name)
~$ grep -i "NoScale" /var/log/Xorg.0.log
(II) CHROME(0): Not using mode "720x576NoScale" (no mode of this name)
~$ grep -i "ModeLine" /var/log/Xorg.0.log (and the lines before added, they might be relevant)
(**) CHROME(0): *Built-in mode "640x480": 0.0 MHz, 37861.1 kHz, 73.3 Hz
(II) CHROME(0): Modeline "640x480"x73.3    0.00  640 0 0 0  480 0 0 0 (37861.1 kHz)
(**) CHROME(0): *Built-in mode "720x576": 0.0 MHz, 35855.8 kHz, 60.6 Hz
(II) CHROME(0): Modeline "720x576"x60.6    0.00  720 0 0 0  576 0 0 0 (35855.8 kHz)
(**) CHROME(0): *Built-in mode "800x600": 0.0 MHz, 48077.4 kHz, 72.7 Hz
(II) CHROME(0): Modeline "800x600"x72.7    0.00  800 0 0 0  600 0 0 0 (48077.4 kHz)
(**) CHROME(0):  Built-in mode "720x540"
(**) CHROME(0):  Built-in mode "720x480": 0.0 MHz, 29799.6 kHz, 60.5 Hz
(II) CHROME(0): Modeline "720x480"x60.5    0.00  720 0 0 0  480 0 0 0 (29799.6 kHz)

The relevant sections of xorg.conf are at the end.  I'm confused as to why the X can't find the "640x480Over" etc.? I can see they are defined in via_vt162x.h, everywhere but the VT1625 tables (which I have).  So I tried replacing the "640x480" modeline with the VT1623 tables modeline in the two tables, which alas changes nothing.  I also tried changing the via_mode.h in the same way.

All those 0's in the "built-in" section above are suspicious.  I wonder if none of the modes defined in the via_vt162x.h are being found, and X is using some internal fall back?

Does anyone have any idea how to go about fixing this, or at least finding more out about where it is going wrong?

Thanks

Dan

Xorg.conf snippet (Some of it is obviously unnecessary - I was trying things for the unichrome driver):

Section "Monitor"
? ? ? ? Identifier? "TV"
? ? ? ? HorizSync? ? 24.0 - 80.0
? ? ? ? VertRefresh? 50.0 - 74.0
# Set for 16:9 display
? ? ? ? DisplaySize? ???400 225

? ? ? ? #Refresh Rate 60Hz
? ? ? ? ModeLine "720x480" 26.7 720 736 808 896 480 481 484 497
? ? ? ? ModeLine "720x576" 32.7 720 744 816 912 576 577 580 597
? ? ? ? ModeLine "848x480" 31.5 848 864 952 1056 480 481 484 497
? ? ? ? ModeLine "856x480" 31.7 856 872 960 1064 480 481 484 497
EndSection


Section "Device"
? ? ? ? Identifier? ? ? "VIA"
? ? ? ? Driver? ? ? ? ? "openchrome"
??? Option ??? ??? "SWCursor" "on"
??? Option "TVOutput" "S-Video"
? ? ? ? Option? ? ? "ActiveDevice" "TV"
? ? ? ? Option? ? ? ? ? "VBEModes" "true"???# Comment in for TV-out
EndSection

Section "Screen"
? ? ? ? Identifier "Default Screen"
? ? ? ? Device? ???"VIA"
? ? ? ? Monitor? ? "TV"
? ? ? ? DefaultDepth? ???16
? ? ? ? SubSection "Display"
? ? ? ? ? ? ? ? Viewport???0 0
? ? ? ? ? ? ? ? Depth? ???24
? ? ? ? ? ? ? ? Modes? ? "640x480" "720x576" "800x600" "800x600Over" "720x576Over" "720x576NoScale" "640x480Over"
? ? ? ? EndSubSection
? ? ? ? SubSection "Display"
? ? ? ? ? ? ? ? Depth? ???16
? ? ? ? ? ? ? ? Modes? ? "640x480" "720x576" "800x600" "800x600Over" "720x576Over" "720x576NoScale" "640x480Over"
? ? ? ? EndSubSection
EndSection