[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 #41 from Kevin Brace <kevinbrace at gmx.com> ---
P Touchman, I am taking a break from OpenChrome development for several weeks
to work on a different graphics stack (r128), but I am still willing to do some
troubleshooting sometimes.
I think the problem is with OpenChrome DDX in this situation as explained with
Comment 39 since I was able to reproduce the problem.
I do not think feeding those EDID parameters really matter since they are KMS
related, and the OpenChrome DDX you are dealing with does not currently handle
KMS since OpenChrome DRM is still mainlined.


(In reply to ptouchman from comment #40)
> 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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