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Old 03-14-10, 08:30 PM   #37
peepingtom
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Default Re: Quadro FX 880M Stability Problems

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.
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Old 03-18-10, 02:16 PM   #38
mendelrat
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Default Re: Quadro FX 880M Stability Problems

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


Quote:
Originally Posted by danix View Post
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.
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File Type: gz nvidia-bug-report.log.gz (40.9 KB, 138 views)
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Old 03-20-10, 10:54 PM   #39
ledoc
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Default Re: Quadro FX 880M Stability Problems

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.
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Old 04-25-10, 12:22 PM   #40
sse
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Default Re: Quadro FX 880M Stability Problems

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...
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Old 04-26-10, 12:18 PM   #41
peepingtom
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Default Re: Quadro FX 880M Stability Problems

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.
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Old 04-27-10, 03:41 PM   #42
danix
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Default Re: Quadro FX 880M Stability Problems

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
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Old 04-27-10, 04:11 PM   #43
sse
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Default Re: Quadro FX 880M Stability Problems

Hi danix,

thanks a lot for tackling this topic.

I've attached the iasl output for my W510.
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File Type: bz2 DSDT.dsl.bz2 (28.2 KB, 124 views)
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Old 04-27-10, 04:51 PM   #44
danix
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Default Re: Quadro FX 880M Stability Problems

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.
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Old 05-18-10, 02:09 PM   #45
m5shiv
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Default Re: Quadro FX 880M Stability Problems

Danix,

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

Thanks,
Shiv
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Old 05-28-10, 01:33 PM   #46
cqz123
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Default Re: Quadro FX 880M Stability Problems

Quote:
Originally Posted by ledoc View Post
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
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Old 05-30-10, 03:02 AM   #47
Anarcho
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Default Re: Quadro FX 880M Stability Problems

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

Here is the logfile:nvidia-bug-report.log.gz
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Old 06-02-10, 07:01 PM   #48
Yofel
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Default Re: Quadro FX 880M Stability Problems

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