[LAU] Bug: kernel or ardour related?

Mark Knecht markknecht at gmail.com
Tue Dec 16 11:39:09 EST 2008

   Not sure if you meant to send this to only me or whether I got
dropped on the LAU reply. anyway, responding with a copy back to the

   I've used the rt-kernel with the OS ATI driver for a long time.
Works fine for me. I run 1280x1024 with my ATI  RV300. (Radeon X300
PCIE) I'm not restricted to 800x600.

- Mark

lightning ~ # uname -a
Linux lightning 2.6.24-rt1 #1 PREEMPT RT Tue Feb 5 07:03:44 PST 2008
x86_64 AMD Athlon(tm) 64 Processor 3000+ AuthenticAMD GNU/Linux

lightning ~ # lsmod | grep radeon
radeon                118944  2
drm                    85720  3 radeon

lightning ~ # xrandr
Screen 0: minimum 400 x 300, current 1280 x 1024, maximum 1280 x 1024
default connected 1280x1024+0+0 0mm x 0mm
   1280x1024      75.0*    60.0
   1024x768       75.0     70.0     60.0
   800x600        75.0     72.0     60.0     56.0
   640x480        75.0     73.0     60.0
   1280x960       60.0
   1152x864       75.0
   1152x768       55.0
   832x624        75.0
   416x312        75.0
   400x300        75.0     72.0     60.0
lightning ~ #

On Mon, Dec 15, 2008 at 11:51 PM, Matthias Schönborn <mbs1303 at gmx.de> wrote:
> Am Montag, den 15.12.2008, 17:31 -0800 schrieb Mark Knecht:
>> On Mon, Dec 15, 2008 at 3:23 PM, Matthias Schönborn <mbs1303 at gmx.de> wrote:
>> > Well, the day before yesterday I built the fglrx-modules for linux-rt,
>> > but now each time I try to use ardour it disconnects after a few minutes
>> > with the message that jack disconnected ardour for not being fast
>> > enough. Each time my whole system hangs for a few seconds, and cpu load
>> > is reported to be "e+02", e.g. 100% in qjackctl. Now dmesg tells me:
>> >
>> There are reasons the rt-kernel developers tell us not to use the ATI
>> closed source driver. I suspect the problems you are seeing fall
>> pretty much squarely in that domain. The fglrx driver is not (as far
>> as we know) designed to be real-time safe. No one can tell you what
>> it's doing internally that might cause a time delay and kick out
>> Ardour, but it seems to be doing that.
>> I'm curious as to why are you interested in using this driver on a
>> platform running Ardour. Is this machine dual-purpose? I.e. - is audio
>> a part time thing and you also do gaming, etc.? If you must do gaming
>> I think you're better off to go with NVidia. I've got both here and
>> have fewer problems with NVidia, but that's just my experience.
>> Good luck,
>> Mark
> Well I suspected that, they even purposely removed the fglrx modules
> from linux-restricted-modules-rt - Then there's no fix, I guess... The
> only reason I installed this driver is, that otherwise I'm not able to
> get a resolution higher than 800x600. I'd be much happier if I could use
> the open source driver ati / radeon, but so far I had no success in
> doing so. I don't need hardware acceleration, I just want to be able to
> use something higher than 800x600, preferably 1400x1050...
> So, new question: Is there anybody on this list who uses the open ati
> driver (xserver-xorg-video-radeon, Driver "radeon" in xorg.conf) with
> linux-rt? Anyone?
> Matthias

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