DisplayLink Forum - "EDID Invalid" On Xubuntu 16.04

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"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.

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

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".

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

Cheers,
Michal

EDID And SIGSEGV

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.

Quote:

Originally Posted by mlukaszek (Post 80203)

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

Sent over PM

Thanks, I've raised this internally for analysis.

Cheers,
Michal

having the same issue...
any solution to this yet ?

Code:

[   49.032846] usb 2-1.1: new high-speed USB device number 3 using ehci-pci

[   49.128660] usb 2-1.1: New USB device found, idVendor=17e9, idProduct=0033

[   49.128672] usb 2-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3

[   49.128677] usb 2-1.1: Product: K33907

[   49.128682] usb 2-1.1: Manufacturer: DisplayLink

[   49.128686] usb 2-1.1: SerialNumber: 0033-100831

[   50.148085] [drm] vendor descriptor length:e0 data:00 00 00 00 00 00 00 00 00 00 00

[   50.148095] [drm:udl_driver_load [udl]] *ERROR* Unrecognized vendor firmware descriptor

[   50.196976] EDID block is all zeroes

[   50.196991] udl 2-1.1:1.0: DVI-I-1: EDID invalid.

[   50.197561] udl 2-1.1:1.0: fb1: udldrmfb frame buffer device

[   50.197564] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).

[   50.197564] [drm] No driver support for vblank timestamp query.

[   50.197566] [drm] Initialized udl on minor 1

[   50.197591] usbcore: registered new interface driver udl

[   50.390848] EDID block is all zeroes

[   50.390864] udl 2-1.1:1.0: DVI-I-1: EDID invalid.

[   50.438966] EDID block is all zeroes

[   50.438977] udl 2-1.1:1.0: DVI-I-1: EDID invalid.

[  120.941994] EDID block is all zeroes

[  120.942011] udl 2-1.1:1.0: DVI-I-1: EDID invalid.

[  121.081365] EDID block is all zeroes

[  121.081383] udl 2-1.1:1.0: DVI-I-1: EDID invalid.

[  306.286639] EDID block is all zeroes

[  306.286655] udl 2-1.1:1.0: DVI-I-1: EDID invalid.

[  758.287223] EDID block is all zeroes

[  758.287230] udl 2-1.1:1.0: DVI-I-1: EDID invalid.

[  758.364453] EDID block is all zeroes

[  758.364460] udl 2-1.1:1.0: DVI-I-1: EDID invalid.

[  758.441228] EDID block is all zeroes

[  758.441235] udl 2-1.1:1.0: DVI-I-1: EDID invalid.

[  758.459631] evdi: module verification failed: signature and/or required key missing - tainting kernel

[  758.461167] evdi: [I] Initialising logging on level 5

[  759.439734] EDID block is all zeroes

[  759.439761] udl 2-1.1:1.0: DVI-I-1: EDID invalid.

[  759.488616] EDID block is all zeroes

[  759.488628] udl 2-1.1:1.0: DVI-I-1: EDID invalid.

Don't use udl and evdi together. For devices requiring evdi, make sure udl is blacklisted. For USB 2.0 devices using DL-1xx chips, stick to udl, and don't install evdi.

Cheers,
Michal

Thanks for helping out Michal!

uninstalled evdi
un-blacklisted udlfb
screen works, but can't set native resolution (1280x1024), only options are 800x600 and 1024x768

help?