[openchrome-devel] [Bug 106392] blank screen on OpenChrome with VIA VE900

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106392

--- Comment #40 from ptouchman at gmail.com ---
Hi Kevin,

Sorry to not reply for a couple of weeks, I haven't had time to fiddle with the
VX900.  I got a new power supply and it emits a lot of chemical odors so every
time I work with it it feels like its poisoning me.  That's discouraging me
from working with it lately so I've only been firing up the VX900 for very
short periods.





I did get an interesting bit of kit the other day, an NEC Theatersync video
processor that will tell me what the frequency is of the vga input signal even
if it can't display it.  I was thinking that that would tell me what the
frequency is of the "out of range" video.  If you feed it a signal that it
doesn't like it gives you a blue screen but the OSD menus and information still
work.

So the Theatersync can take in VGA up to 1366x768 and rescale it to output VGA
and HDMI.

The NEC Theatersync gives out its own EDID and both Knoppix 8.1 and 8.2 will go
to x just fine on the VX900.


But I've got a wacky Sansui SLED2900 29 inch tv that gives out no EDID at all
on its VGA port and the VX900 thinks that it's got no connection, and the old
"out of range" message.

I was thinking that maybe I could force-feed the driver an EDID file with a
kernel boot parameter if that would help.


from https://wiki.archlinux.org/index.php/kernel_mode_setting


drm_kms_helper.edid_firmware=edid/your_edid.bin
drm.edid_firmware=edid/your_edid.bin

Resolution      Name
800x600         edid/800x600.bin
1024x768        edid/1024x768.bin
1280x1024       edid/1280x1024.bin
1600x1200       edid/1600x1200.bin
1680x1050       edid/1680x1050.bin
1920x1080       edid/1920x1080.bin

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