x.org crashes because Displaylink find unknown EDID

[Henneyng]

Binary package hint: xserver-xorg-video-displaylink

Hello,

we have an USB-to-DVI Graphic adapter (Model WS-UGA12D1 from Winstar) with DisplayLink Chip and have installed it according to http://ubuntuforums.org/showthread.php?p=9358565 (we have 10.04 LTS with all updates, too). Sometimes it works fine, but sometimes X.org don't start. Then, in xorg.0.conf is written:

...
(II) DL(0): using /dev/fb1
(EE) DL(0): Unknown EDID version 0
(**) DL(0): Depth 16, (--) framebuffer bpp 16
(==) DL(0): RGB weight 565
(==) DL(0): Default visual is TrueColor
(==) DL(0): Using gamma correction (1.0, 1.0, 1.0)
(II) DL(0): hardware: WS Tech USB-DVI (video memory: 2560kB)
(**) DL(0): Option "fbdev" "/dev/fb1"
(II) Loading sub module "fb"
(II) LoadModule: "fb"
(II) Loading /usr/lib/xorg/modules/libfb.so
(II) Module fb: vendor="X.Org Foundation"
 compiled for 1.7.6, module version = 1.0.0
 ABI class: X.Org ANSI C Emulation, version 0.4
(II) DL(0): Output WS Tech USB-DVI using monitor section VGADisplayLinkMonitor
(EE) DL(0): Unknown EDID version 0
(II) DL(0): EDID for output WS Tech USB-DVI

Backtrace:
0: /usr/bin/X (xorg_backtrace+0x3b) [0x80e938b]
1: /usr/bin/X (0x8048000+0x61c8d) [0x80a9c8d]
2: (vdso) (__kernel_rt_sigreturn+0x0) [0x183410]
3: /usr/bin/X (InitOutput+0x5c8) [0x80b9c98]
4: /usr/bin/X (0x8048000+0x1ebbb) [0x8066bbb]
5: /lib/tls/i686/cmov/libc.so.6 (__libc_start_main+0xe6) [0x37dbd6]
6: /usr/bin/X (0x8048000+0x1e961) [0x8066961]
Segmentation fault at address 0x18

Caught signal 11 (Segmentation fault). Server aborting
...

I think that this is an EDID error. The intel-driver has an option which can disable EDID. However, I didn't find such a option for the displaylink-driver.

Has anybody a workaround or a solution for this problem?

If you have further questions, please contact me. Thanks in advance.

Regards, Henning

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[MinSik CHO (mscho527)]

Same thing happens for me. I have my device with DL-125 chip, and it says that the raw EDID is invalid.