Re: rt kernels

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Ralf Mardorf wrote:
On Wed, 2011-06-08 at 22:02 -1000, david wrote:
JÃrn 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@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@xxxxxxxxxxxxx
authenticity, honesty, community
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