Quoting Roger Heflin <rogerheflin@xxxxxxxxx>:
Robert P. J. Day wrote:
i'm still fighting to get my WUXGA display laptop to ignore the
EDID information coming back from a video device, so i simplified
the problem and here's what's happening so far.
i have a fresh install of f9 on an aging dell inspiron 9200 with a
full WUXGA display, and i'm trying to drive a full-res WUXGA
signal into an external video processing device that is
(theoretically) supposed to be able to handle that.
if i connect my laptop to an external full WUXGA flat-panel
(Samsung) display, no problem -- the image is perfect,
pixel-for-pixel, and full WUXGA on both laptop and external monitor.
if, however, i connect the laptop to that external video device,
that external device is (apparently) returning EDID information
that claims to not be able to accept full WUXGA (even though it
should be able to, allowing us to conclude that its EDID info is
simply wrong and we'll have to fix that at some point.) and doing
that also forces my laptop down to a lower resolution. argh.
i figured that a simple solution is to just configure my laptop to
ignore incoming EDID and keep driving the signal at full WUXGA,
but i can't get that to work. here's my change to
/etc/X11/xorg.conf (text copied by hand as the laptop is not on
the net):
Section "Device"
Identifier "Videocard0"
Driver "Radeon"
Option "IgnoreEDID" "True" <-- added this
EndSection
as an experiment, i connected the laptop to a flat panel dell
1280x1024 display to see what would happen, logged out, logged back
in, and the Xorg log file contains the line:
(**) RADEON(0): Option "OptionEDID" "True"
which i would have thought confirms the ignoring of incoming EDID,
but i still get the same effect of having my laptop resolution
dropped noticeably (in this case, to 1152x864, according to
"xdpyinfo"), ostensibly to accommodate the decreased resolution of
the external monitor.
so,
1) is there something else i should be trying to get my laptop to
totally ignore the fact that it's connected to an external device
that claims to not be capable of full WUXGA, and
2) if i succeed in ignoring EDID with this test flat panel,
obviously, the flat panel can't handle that (full WUXGA) signal so
i'm not expecting to get a useful image, but is there a chance i
could damage the flat panel?
open to suggestions.
rday
You might try UseEDID as:
Option "UseEDID" "FALSE"
And see if it works any better.
nope, that made no difference. in fact, from the X log file,
it doesn't appear that it had any effect at all. at least with
Option "IgnoreEDID" "True"
the contents of the X log file suggest that EDID processing is
cancelled (even though it clearly isn't). with the option above,
the X log file shows that EDID processing is occurring normally.
in short, still doesn't solve the problem.
rday
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