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Old 02-21-11, 03:35 PM   #13
Emilb
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Default Re: Blank Screen on HP EliteBook 8540w with NVIDIA driver

Quote:
Originally Posted by brucecadieux View Post
No need to "build" a kernel.

You can add the stable kernel repository to opensuse and install the latest stable kernel. (2.6.37.1)

http://download.opensuse.org/reposit.../openSUSE_11.3
Well I needed to build a kernel since I've been trying to debug some issues with this particular piece of hardware. He needed to build one since he was not running Opensuse.
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Old 02-22-11, 08:15 AM   #14
chralg
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Default Re: Blank Screen on HP EliteBook 8540w with NVIDIA driver

Hi.

I posted a solution for HP 8540W with Quadro 1800 FX and Dreamcolor 2 here.

Thanks
Chris
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Old 02-24-11, 12:16 AM   #15
thwint
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Default Re: Blank Screen on HP EliteBook 8540w with NVIDIA driver

The soluion posted by Chris is an acceptable workaround for me.
I'm more interested in a high resolution than in 3d effects.

Thx Chris
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Old 02-24-11, 08:17 AM   #16
Emilb
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Default Re: Blank Screen on HP EliteBook 8540w with NVIDIA driver

At this point I'm considering sending this laptop back to HP since I am within the 30 day return window. The machine is certified Linux compatible by HP and the Quadro FX880M is officially supported by the Nvidia proprietary driver but you can't use DDC to control the display which is critical with the Dreamcolor panel. It's definitely a bug in the Nvidia driver since nouveau does let you control the display with DDC. Unfortunately Nouveau is too unstable for 3D use. And from what others have posted the 1800M doesn't even work at all with the proprietary driver even though it is listed as a supported chipset.

Can anyone from Nvidia comment on these issues? Is the issue even recognized and is there any chance of a fix?
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Old 02-24-11, 10:11 AM   #17
chralg
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Default Re: Blank Screen on HP EliteBook 8540w with NVIDIA driver

Hi.
Great that it works for you!
I've been working some more with the nvidia driver and all i manage to get is black or scrambled screen output. It feels like the nvidia driver is unable to probe the built in settings for this screen. I've even forced the output to 1920x1080 with what feels like the correct screen settings, custom EDID etc etc and it still fails. The LG0220 (actual screen author) feels not supported with this driver. Everything works in windows...

It's time to write nvidia an bug report.
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Old 02-24-11, 10:29 AM   #18
chralg
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Default Re: Blank Screen on HP EliteBook 8540w with NVIDIA driver

Hi!

Quote:
Originally Posted by chralg View Post
It's time to write nvidia an bug report.
And the bug report is '110224-000048'.

Hope this helps.

Chris
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Old 03-03-11, 03:43 PM   #19
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Default Re: Blank Screen on HP EliteBook 8540w with NVIDIA driver

Thanks for your time reporting this bug. What can we do with this information now? Is there a site one can check for the state of this bug report?
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Old 03-08-11, 08:49 PM   #20
Emilb
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Default Re: Blank Screen on HP EliteBook 8540w with NVIDIA driver

Well I gave up on this machine today and am sending it back to HP before my 30 day return period is up. Given that the 8540W with the Dreamcolor display is a low volume item to begin with I imagine the number of Linux users with this hardware is so small that there is about zero chance of Nvidia putting in any resources towards fixing the driver issues. It's a shame because it is hands down the nicest screen you get on a laptop today.
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Old 03-17-11, 02:41 PM   #21
DJravingMonkey
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Default Re: Blank Screen on HP EliteBook 8540w with NVIDIA driver

Thats so sad! ich want my dreamcolor 2 screen working in any OS! It's such a great display!
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Old 03-17-11, 02:58 PM   #22
zander
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Default Re: Blank Screen on HP EliteBook 8540w with NVIDIA driver

FWIW, we did look at the inability to light up the eDP panel (as well as unavailability of the highest p-state(s)) and root-caused it to a system-level problem outside the NVIDIA driver. More specifically, there's an interaction problem between the ACPI DSDT as defined by the system's SBIOS and the Linux kernel's ACPI subsystem. It's unclear at this time if the SBIOS or the Linux kernel is at fault - we'll report back once we know for sure.
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Old 03-17-11, 04:26 PM   #23
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Default Re: Blank Screen on HP EliteBook 8540w with NVIDIA driver

Thanks for the update.

If you have any further information or possible workarounds I'm willing to help.

Currently with Kernel 2.6.38 on Ubuntu Natty I can work. Only 3D is not working at the moment.
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Old 03-17-11, 04:58 PM   #24
zander
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Default Re: Blank Screen on HP EliteBook 8540w with NVIDIA driver

The problem appears to be a duplicate entry in the DSDT for the PCI-E bridge upstream of the discrete GPU. On the systems I looked at, the devices PEGP and PEG3 both refer to the bridge @ 00:03.0, i.e. both have an _ADR identifier with the value 0x30000. This indirectly causes the NVIDIA driver's ACPI handle lookup attempt to fail for the GPU in question, which in turns prevents the driver from obtaining important information via ACPI methods associated with the GPU.

In my experiments, I found that either reordering or merging the two devices in the DSDT was enough to avoid the problem. In order to do this, the DSDT needs to be dumped , disassembled, patched up (in my case, there were various errors aside from the problem discussed above), reassembled and finally fed to the Linux kernel as a custom DSDT.
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