hdmi monitor with nouveau

[JoiDegn]

Hey guys,

Im having trouble connecting a hdmi monitor to my dell xps 15. When I connect the monitor to the laptop the monitor screen remains black (but a connection is apparently recognized), the gnome monitor application thingy doesnt detect the monitor and neither does xrandr.

I am using the nouveau xorg-x11-drv-nouveau.x86_64
Version : 0.0.16
Release : 11.20100826git065576d.fc14

Currently I have no nvidia drivers installed.

dmesg might be interesting:
[ 326.773865] [drm] nouveau 0000:02:00.0: plugged HDMI-A-2
[ 326.993625] [drm:output_poll_execute] *ERROR* delayed enqueue failed -125
[ 327.112599] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 110
[ 327.112603] [drm:drm_edid_block_valid] *ERROR* Raw EDID:
[ 327.112607] <3>00 ff ff ff ff ff ff 00 10 ac 16 f0 4c 4e 4a 34 ............LNJ4
[ 327.112609] <3>0f 14 01 03 80 34 20 78 ea 1e c5 ae 4f 34 b1 26 .....4 x....O4.&
[ 327.112611] <3>0e 50 54 a5 4b 00 81 80 a9 40 d1 00 71 4f 01 01 .PT.K....@..qO..
[ 327.112613] <3>01 01 01 00 00 00 00 01 01 01 28 3c 80 a0 70 b0 ..........(<..p.
[ 327.112615] <3>23 40 30 20 36 00 06 44 21 00 00 1a 00 00 00 ff #@0 6..D!.......
[ 327.112617] <3>00 46 35 32 35 4d 30 34 39 34 4a 4e 4c 0a 00 00 .F525M0494JNL...
[ 327.112619] <3>00 fc 00 44 45 4c 4c 20 55 32 34 31 30 0a 20 20 ...DELL U2410.
[ 327.112621] <3>00 00 00 fd 00 38 4c 1e 51 11 00 0a 20 20 20 20 .....8L.Q...

Does anybody have any idea what might be causing the problem and how I might be able to fix it?

thanks,
Joi

[Magickman]

Hello, had this happen to me a few times. You will probably be forced to do a fresh install with the new monitor hooked up. You might also get into BIOS, and see if the monitor is recognized, and whether your video card is on-board of PCI.

[jpollard]

It doesn't recognize the monitor because the EDID data is bad.

Check the cable, and if possible, try a replacement. If it still fails, try the VGA connection just for testing.

It is possible the cable may be bad and that is causing the EDID data to fail.

[JoiDegn]

The cable works with a different notebook and i have the same problem with a replacement cable. Unfortunately i cannot test vga because my notebook doesbt have a connector. Damn modern hardware :-)

[jpollard]

Does the monitor work with the other notebook? It is possible that the monitor itself is "broken" in that the EDID data is invalid at all times.

[JoiDegn]

sorry that I wasnt precise. Both cable and monitor have been tested with a different notebook and they work perfectly. In fact a colleague of mine works with this monitor both with windows and linux.

[jpollard]

Then it is down a bug in the DRM handling (and EDID error) causing problems.

Can you try an older kernel?

[JoiDegn]

I will am running 2.6.35.14-96.fc14.x86_64 right now and will try to boot into a different kernel later tonight as I am currently working.

thanks

---------- Post added at 06:53 PM ---------- Previous post was at 02:32 PM ----------

Hey,
I did a minor kernel update (2.6.35.14-97.fc14.x86_64) some minutes ago after the kernel release just now. dmesg output changed to

[ 242.044807] [drm] nouveau 0000:02:00.0: plugged HDMI-A-2

after plugging in the monitor. The broken EDID messages dont show up anymore. This is good right? Ill try booting into an older kernel.

---------- Post added at 07:13 PM ---------- Previous post was at 06:53 PM ----------

Ok so the older kernel didnt help but apparently randomly rebooting did. I have rebooted into the current kernel and now the screen shows a fedora icon with a blue background. However, I cannot access the screen. xrandr shows only the laptop screen and the gnome monitor thingy doesnt detect it.

tail /var/log/Xorg.0.log shows

[ 84.568] (II) intel(0): EDID for output VGA1
[ 84.578] (II) intel(0): EDID for output HDMI1
[ 84.579] (II) intel(0): EDID for output DP1

at the end and before that lines upon lines about my notebook monitor I suppose.