[LAU] rt kernels

[david]

Ralf Mardorf wrote:
> On Wed, 2011-06-08 at 22:02 -1000, david wrote:
>> Jörn Nettingsmeier wrote:
>>> On 06/07/2011 10:27 AM, david wrote:
>>>
>>>> The last couple of Ubuntu releases have not included RT kernels because
>>>> Ubuntu thinks no one needs one.
>>> more likely, the latest ubuntu releases were based on kernels newer than 
>>> the latest available rt tree, which creates a very complicated situation 
>>> for distro maintainers.
>>>
>>> with 2.6.39, most of the former rt patchset is now in mainline, and the 
>>> big kernel lock is gone for good. that means the situation should 
>>> improve a lot, and ease the burdon on maintainers of low-latency 
>>> optimized packages.
>> Well, my experience with non-RT kernels is that on my hardware, they are 
>> not sufficient for real audio use. I just upgraded my desktop machine to 
>> 2.6.39, will see how it goes. Audio works, didn't stress it much. Of 
>> course, for some reason, it has decided that my 17" 1280x1024 monitor 
>> only runs 1024x768 at 60hz ... sigh.
> 
> I experienced the same issues regarding to the resolution and the 60 Hz
> stroboscope (and a non working mouse wheel for my PS/2 mouse, slow down
> Internet for PPPoE etc.) with current debianoid Linux. They drop old
> hardware, even if they claim not to do.

I don't blame Debian for it (if Xorg dropped support for older hardware, 
that's their decision, not Debian's.) But the resolution problem showed 
up after I upgraded to 2.6.39 only (no Xorg upgrade involved at that point).

> Regarding to the monitor, I downgraded X and then I got back the wanted
> 1152x864 at 90Hz. The monitor can do better than 90 Hz, debianoid Linux for
> my setup can't anymore, but I guess there's no difference between 90 Hz
> and > 90 Hz.
> 
> I'm using xserver-xorg-video-nv 1:2.1.17-3 + depending X packages, it's
> from Debian stable, while anything else should be from Debian testing.
> For Debian testing there's no nv driver anymore and the nouveau doesn't
> work on my machine, when using a kernel-rt.

The 2.6.39 kernel I got from Aptosid isn't an RT kernel.

> Perhaps a downgrade will solve the issue on your machine too. 60 Hz
> vertically is unhealthy.

Yup bugs my eyes. My monitor was doing 1280x10124 @ 87HZ before the 
kernel upgrade ... When I checked, the Nouveau driver isn't even 
installed on the machine. I saw some bug reports for the Nouveau driver 
at debian.org saying something about the kernel preventing the driver 
from getting EDIT info from the monitor, so the driver assumes a save 
1024x768x60hz. Sigh.

I can use video=1280x1024 on the kernel command line to get that 
resolution, but it's still using 60hz refresh.

So I set my previous kernel to be GRUBs default and will only select 
2.6.39 when I need to.

-- 
David
gnome at hawaii.rr.com
authenticity, honesty, community