"EDID Invalid" On Xubuntu 16.04

OIKgnPdgNWHf · 05-18-2016, 01:10 PM

Display worked at first, but after a few reboots now dmesg reports this error and the display is no longer working.

Code:

[D] evdi_detect (dev=1) Painter is connected
[D] evdi_painter_get_edid (dev=1) 54 c4 ff
evdi evdi.0: DVI-I-1: EDID invalid.

This is an HP Envy laptop. While I appreciate there is a support tool to dump more info, this is a work computer which cannot have its debug info publicly disclosed.

mlukaszek · 05-18-2016, 01:49 PM

The information you provided indicates that the EDID is indeed invalid. The first three bytes that are printed out should be 00 ff ff.
What monitor is it? Does it work without problems if it's connected directly to any PC? Can you dump an EDID from it and attach here?

Cheers,
Michal

OIKgnPdgNWHf · 05-19-2016, 06:00 PM

Monitor is an Acer R240HY which works fine connected directly to the HDMI port on the same computer. FWIW, now dmesg reports 3 different bytes for the EDID: "54 64 52".

mlukaszek · 05-20-2016, 05:24 PM

This is interesting. Any chance you could send us at least DL logs from /var/log/displaylink?

Cheers,
Michal

OIKgnPdgNWHf · 06-03-2016, 12:14 PM

Quote:

Originally Posted by mlukaszek

This is interesting. Any chance you could send us at least DL logs from /var/log/displaylink?

Sent over PM

mlukaszek · 06-08-2016, 09:34 AM

Thanks, I've raised this internally for analysis.

Cheers,
Michal

OIKgnPdgNWHf · 06-03-2016, 12:04 PM

Today when I booted the driver produced a SIGSEGV ("Cannot access memory at address") error without a monitor plugged into the adapter. So I tried a different monitor of the same model with the adapter and got the following EDID:

Quote:

Raw EDID:
54 d4 7f 0b 2e 7f 00 00 00 01 00 00 2d 7f 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

The other monitor also produced a mostly null/zero EDID like the one above.

DisplayLink version is 1.1.68. I recall trying 1.0.335 first; not sure if that is a factor.

05-18-2016, 01:10 PM	#1
OIKgnPdgNWHf Junior Member Join Date: May 2016 Posts: 4	"EDID Invalid" On Xubuntu 16.04 Display worked at first, but after a few reboots now dmesg reports this error and the display is no longer working. Code: [D] evdi_detect (dev=1) Painter is connected [D] evdi_painter_get_edid (dev=1) 54 c4 ff evdi evdi.0: DVI-I-1: EDID invalid. This is an HP Envy laptop. While I appreciate there is a support tool to dump more info, this is a work computer which cannot have its debug info publicly disclosed.

05-18-2016, 01:49 PM	#2
mlukaszek Senior Member Join Date: Feb 2010 Posts: 386	The information you provided indicates that the EDID is indeed invalid. The first three bytes that are printed out should be 00 ff ff. What monitor is it? Does it work without problems if it's connected directly to any PC? Can you dump an EDID from it and attach here? Cheers, Michal

05-19-2016, 06:00 PM	#3
OIKgnPdgNWHf Junior Member Join Date: May 2016 Posts: 4	Monitor is an Acer R240HY which works fine connected directly to the HDMI port on the same computer. FWIW, now dmesg reports 3 different bytes for the EDID: "54 64 52".

05-20-2016, 05:24 PM	#4
mlukaszek Senior Member Join Date: Feb 2010 Posts: 386	This is interesting. Any chance you could send us at least DL logs from /var/log/displaylink? Cheers, Michal

06-08-2016, 09:34 AM	#6
mlukaszek Senior Member Join Date: Feb 2010 Posts: 386	Thanks, I've raised this internally for analysis. Cheers, Michal