[Libdlo] Multiscreen troubles with displaylink and intel
fb at intoxicatedmind.net
Fri Oct 9 05:35:20 PDT 2009
On Thu 2009-10-08 08:49, Bernie Thompson <bernie at berniethompson.com>
> My testing has been nearly all with multiseat, so I'm ignorant of many of
> the Xinerama and Xrandr ins and outs of getting extended desktop working.
> So I may get this wrong, but some of the potential causes:
> * Because xorg doesn't have multiadapter support yet -- without Xinerama on,
> the displaylink and intel drivers can't coexist in the same layout, which
> may be the cause of the unload. Anyone know another way in which they
Alright, so I guess I tried to do something that was just not possible.
> * Probably don't want to have a SubSection "display" today for any
> displaylink device if you're using the monitor's preferred mode, as
> displaylink-mod gets the best timings from EDID, there are no Depth options,
> and 24bpp may cause a problem (seemed like removing that solved a problem
> recently - mentioned on this list)
You are right, that section was not necessary at all. My "dlonly" layout
works fine without it.
> * The current displaylink framebuffer driver is 16bpp (and may want to stay
> that way for performance/simplicity reasons). Xinerama requires all screens
> to be at the same color depth.
> I'd try setting the Intel/TV to 16bpp and turn Xinerama on, and see if that
I tried it with Xinerama turned on and this "Screen" section for my TV:
Modes "720x576 at 60.00"
This puts my intel TV screen into 16bpp mode, as Xorg.log shows:
(**) intel(0): Depth 16, (--) framebuffer bpp 16
But the displaylink module still gets unloaded:
(WW) intel(0): Register 0x61110 (PORT_HOTPLUG_EN) changed from 0x00000000 to 0x00000020
(II) UnloadModule: "displaylink"
(II) Unloading /usr/local/lib/xorg/modules/drivers//displaylink_drv.so
(II) UnloadModule: "fbdevhw"
(II) Unloading /usr/lib/xorg/modules/linux//libfbdevhw.so
And finally leads to X crashing with this:
0: /usr/bin/X11/X(xorg_backtrace+0x26) [0x4ee026]
1: /usr/bin/X11/X(xf86SigHandler+0x39) [0x4836c9]
2: /lib/libc.so.6 [0x7f95824e8db0]
3: /usr/bin/X11/X(RRCrtcGammaSet+0x1e) [0x51820e]
4: /usr/lib/xorg/modules/drivers//intel_drv.so [0x7f9580ce8f63]
5: /usr/bin/X11/X [0x489eb3]
6: /usr/bin/X11/X [0x489fe8]
7: /usr/bin/X11/X(xf86HandleColormaps+0x281) [0x48afc1]
8: /usr/lib/xorg/modules/drivers//intel_drv.so [0x7f9580ced75f]
9: /usr/bin/X11/X(AddScreen+0x1c6) [0x432ac6]
10: /usr/bin/X11/X(InitOutput+0x241) [0x46d361]
11: /usr/bin/X11/X(main+0x200) [0x4331d0]
12: /lib/libc.so.6(__libc_start_main+0xe6) [0x7f95824d55c6]
13: /usr/bin/X11/X [0x432819]
Fatal server error:
Caught signal 11. Server aborting
Any ideas what else I could try? A patched intel driver was mentioned
some time ago on this list. Could that help maybe?
Or will I finally have to go the multiseat way? I have not yet tried
that, as it seems overly complicated for my use case - I just want the
displaylink as a dumb additional screen which can show some infos like
currently playing song etc. without the need to turn on my TV.
Frank Blendinger | fb(at)intoxicatedmind.net | GPG: 0x0BF2FE7A
Fingerprint: BB64 F2B8 DFD8 BF90 0F2E 892B 72CF 7A41 0BF2 FE7A
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