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Old 05-09-11, 04:48 PM   #1
nlamarra
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Default gdm blank screen for 270 under Ubuntu Natty

Just installed Ubuntu Natty Narwhal on a new Dell XPS 17 (i7-2630QM + nVidia 550GTm) and configured xorg.conf. No apparent errors, and graphics display is active but blank (or at zero brightness). Text logins are OK (tty01-06). Any clues?
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Old 05-09-11, 06:01 PM   #2
Fackamato
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Default Re: gdm blank screen for 270 under Ubuntu Natty

logs? bug report?
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Old 05-09-11, 07:01 PM   #3
nlamarra
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Default Re: gdm blank screen for 270 under Ubuntu Natty

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Originally Posted by Fackamato View Post
logs? bug report?
I gave up on Natty and tried going back to Maverick (which is running fine on my older Dell XPS1730 Core2 duo), but got the same issue. Initial Maverick driver works OK in gdm (but doesn't recognize external monitor attached via HDMI), but when switched to activate the nvidia driver (requiring a reboot), there's no gdm display at all, and making the attached mods to the xorg.conf file again didn't help.

Here is the bug report. I forgot that I could create this even if the graphics mode wasn't running...
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Old 05-11-11, 04:31 AM   #4
vvilhonen
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Default Re: gdm blank screen for 270 under Ubuntu Natty

I have the same problem. I reported it for the first time 6 months ago, but haven't been getting any solutions.
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Old 05-11-11, 02:54 PM   #5
danix
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Default Re: gdm blank screen for 270 under Ubuntu Natty

The bug report is from Maverick, so it won't contain any information captured from the actual problem configuration. Could somebody post an nvidia-bug-report from Natty?
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Old 05-12-11, 12:33 AM   #6
vvilhonen
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Default Re: gdm blank screen for 270 under Ubuntu Natty

Here you go
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Old 05-13-11, 10:49 AM   #7
nlamarra
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Default Re: gdm blank screen for 270 under Ubuntu Natty

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Originally Posted by danix View Post
The bug report is from Maverick, so it won't contain any information captured from the actual problem configuration. Could somebody post an nvidia-bug-report from Natty?
Ok, I'm back to natty and have progressed somewhat. The trick to getting video seemed to be adding the BusID to xorg.conf, but then I lost it when i started to debug the HDMI output. Eventually, I got video from the HDMI but now I can't get it back on the laptop display.

Moving on to the HDMI audio -- I have not been able to activate this in Linux. All works fine in Windows (as do both laptop and HDMI display), and Windows sound configuration shows 2 devices: Realtek audio and NVidia HDMI audio -- selecting the latter provides sound from the HDMI.

However, in Linux, I don't see any such NVidia HDMI device or any audio card other than card#0, which is Intel HDA. I had a similar problem with my desktop under Maverick, but this was fixed by discovering that card1 device 3 was the NVidia (hw=1,3). In this laptop, I don't see any such NVidia device in /proc/asound or via aplay -L.

Thanks, Norm
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Old 05-15-11, 11:41 AM   #8
nlamarra
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Default Re: gdm blank screen for 270 under Ubuntu Natty

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Originally Posted by nlamarra View Post
Ok, I'm back to natty and have progressed somewhat. The trick to getting video seemed to be adding the BusID to xorg.conf, but then I lost it when i started to debug the HDMI output. Eventually, I got video from the HDMI but now I can't get it back on the laptop display.

Moving on to the HDMI audio -- I have not been able to activate this in Linux. All works fine in Windows (as do both laptop and HDMI display), and Windows sound configuration shows 2 devices: Realtek audio and NVidia HDMI audio -- selecting the latter provides sound from the HDMI.

However, in Linux, I don't see any such NVidia HDMI device or any audio card other than card#0, which is Intel HDA. I had a similar problem with my desktop under Maverick, but this was fixed by discovering that card1 device 3 was the NVidia (hw=1,3). In this laptop, I don't see any such NVidia device in /proc/asound or via aplay -L.

Thanks, Norm
Latest update: I have verified that NVidia works along with Realtek in Windows, and have been able to get 7.1-ch digital audio via HDMI to my receiver which also passes the video properly to Aquos TV at 1920x1080. Selection between analog, Realtek digital, or NVidia digital output is handled properly by the Sound widget in Windows, as is configuration of each output for sample rate, no. bits, no. channels. S o the hardware all works properly.

However, Linux does not see the NVidia audio device (see the aplay -L) attached. I've tried all sorts of probe_mask settings (thanks to http://wiki.xbmc.org/?title=HOW-TO_s...20%2C_or_GT240) but cannot get the NVidia audio to show up. Once I get the device to show up, I know what to do because I went through this successfully with a desktop under Maverick for a GT240 recently. But I need more help getting Linux to recognize the NVidia audio...

One other curiosity -- I "lost" the laptop display when I activated the NVidia driver (it worked under Nouveau), but then discovered that the video was working via the HDMI port (so maybe I should carry around an HDMI monitor with my laptop...). I've tried all sorts of mods to xorg.conf without success in reviving the laptop display, and this may be connected to the reason why I can't get HDMI audio from the NVidia even when I'm displaying on the external monitor. Needless to say, both displays work separately or together in Windows (which is how I got the EDID files for each display).

Any help would be greatly appreciated. Thanks, Norm
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