Arch Linux

alphazo

Member

Registered: 2009-10-20

Posts: 164

Unable to detect external DVI monitors

Today I enabled testing in order to get gnome. Works fine althought I have a problem with external monitors connected to my Lenovo X201 laptop (i915 based if I recall) via Display port (DVI). Neither Gnome display manager or arandr are able to detect the display. If I use VGA everything is fine. This setup was working before the upgrade. The only thing I did when upgrading was to ignore kernel 2.6.38 in order to stay with 2.6.37 from core.

Should I reverse back to xorg from Core? Would that still work with Gnome3?

Last edited by alphazo (2011-04-08 18:51:47)

pyther

Member

Registered: 2008-01-21

Posts: 1,395

Website

Re: Unable to detect external DVI monitors

IIRC there is some Xorg stuff in testing so that probably broke things. I'm going to guess it is somehow related to the video driver.

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alphazo

Member

Registered: 2009-10-20

Posts: 164

Re: Unable to detect external DVI monitors

Well there must have been a mechanical issue with my docking station. Everything is working fine now.

alphazo

Member

Registered: 2009-10-20

Posts: 164

Re: Unable to detect external DVI monitors

Upgrade from April 11 broke a new thing. 2.6.38 kernel from testing was blacklisted on my machine. Now it has hit [Core] so it got updated on my machine. Intel-dri has also been update.
Now even with a VGA cable hooked up to my machine I'm unable to switch to have only external display. Mirror function is working but if I use aRAND to disable LVDS screen (laptop) and only use external VGA then I get a weird flickering on the display. At some point I think I've seen a libc related error message associated to dri.
I also noticed the following in my dmesg [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 138

[drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 138
[drm:drm_edid_block_valid] *ERROR* Raw EDID:
<3>00 ff ff ff ff ff ff 00 21 31 02 60 01 01 01 01  ........!1.`....
<3>10 11 01 03 08 26 1e 96 ea 67 55 a5 5b 47 9c 25  .....&...gU.[G.%
<3>1e 4f 54 bf ef 80 81 80 01 01 01 01 01 01 01 01  .OT.............
<3>01 01 01 01 01 01 30 2a 00 98 51 00 2a 40 30 70  ......0*..Q.*@0p
<3>13 00 78 2d 11 00 00 1e 00 00 00 fc 00 4e 39 31  ..x-.........N91
<3>53 0a 20 20 20 20 20 20 20 20 00 00 03 ff ff ff  S.        ......
<3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ................
<3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ................