"EDID Invalid" On Xubuntu 16.04

[mlukaszek]

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

Cheers,
Michal

[OIKgnPdgNWHf]

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]

Thanks, I've raised this internally for analysis.

Cheers,
Michal

[TomStaels]

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

[   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.

[mlukaszek]

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

[TomStaels]

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?

[mlukaszek]

DRM driver for USB 2.0 DisplayLink Devices is udl, a rewrite of the original udlfb driver (which you shouldn't use). Which one have you unblacklisted?

Thanks,
Michla