Quadro FX 880M Stability Problems

[peepingtom]

danix:
Thanks for the reply. The noise is constant, it occurs whenever the backlight is not running at maximum (after changing brightness using the nVidia driver). I do not experience this with Windows or when I switch in VT. I'm going to round up some t510 users in other forums to confirm this. I hope that the nvidia driver is only using non-optimal brightness graduations or "steps". It sure would suck if this was some sort of complicated issue with the backlight resonating with the LCD when using certain timings . It is an LED backlight though, so I bet this is less likely than it would be with CFL.

edit: I added this xorg.conf stuff to ThinkWiki (a Linux wiki for ThinkPad Users). Users have already posted comments that confirm this issue.

[mendelrat]

I came here for a different reason, but these xorg additions allow me to have backlight control with my Lenovo Y450 laptop with GT 130M graphics. I learned of this after submitting a bug report with ubuntu and googling the "RegistryDwords" stuff that was suggested there

https://bugs.launchpad.net/ubuntu/+s...rs/+bug/540112

Originally Posted by danix

For those experiencing problems with backlight controls, can you please try adding the following line to /etc/X11/xorg.conf in the "Device" section for your GPU:

Option "RegistryDwords" "EnableBrightnessControl=1"

Then restart X and see if brightness controls work.

If they do, please post an nvidia-bug-report.log along with the make and model of your laptop. Thank you.

[ledoc]

Did anyone manage to boot a Fedora 13 alpha live CD (or later daily built) on a W510 with a FX880M?

I get through the grub countdown, then some nouveau messages on the console. Then the Fedora screen with the Fedora logo in the middle and there it's stuck.

[sse]

The high-pitched noises are still present on my W510 with the "RegistryDwords" "EnableBrightnessControl=1" method and 195.36.24, though the buzz might have gotten a bit softer.
Ubuntu Lucid amd64 / kernel 2.6.33.2
Still using the switch to VT / change brightness / switch to X workaround...

[peepingtom]

SSE, thanks for confirming this on these forums, I was worried that the references to this issue on thinkwiki were just copies note I originally posted there

I started a thread here: http://www.nvnews.net/vbulletin/showthread.php?t=150069 on the 15th, i'm going to bump it now.

[danix]

I've been trying to get a ThinkPad T510 so that we can take a look at this issue, but haven't been able to get my hands on one so far. In the meantime, could somebody provide a dump of the ACPI DSDT table for one of these machines? Run the following as root:

acpidump -b -t DSDT -o DSDT.out #this dumps the DSDT table to "DSDT.out" in your current directory
iasl -d DSDT.out #this disassembles the dump file and produces "DSDT.dsl"

Thanks

[sse]

Hi danix,

thanks a lot for tackling this topic.

I've attached the iasl output for my W510.

[danix]

Thanks for the dump, sse. We'll take a look and see if there's anything obvious there. In the meantime I'll continue looking for one of these laptops.

[m5shiv]

Danix,

I can have a T510 dropped of to you tomorrow. Let me know.

Thanks,
Shiv

[cqz123]

Originally Posted by ledoc

Did anyone manage to boot a Fedora 13 alpha live CD (or later daily built) on a W510 with a FX880M?

I get through the grub countdown, then some nouveau messages on the console. Then the Fedora screen with the Fedora logo in the middle and there it's stuck.

I found out this is related to vt-d being enabled. at least that's how I worked around it on my W510

[Anarcho]

The DWORD addition is also working here on a Lenovo T410. Thanks alot!

Here is the logfile:nvidia-bug-report.log.gz

[Yofel]

Brightness works fine here without adding the DWORD after disabling vt-d too. (T510)