Xorg's GeForce driver causes more trouble than the Radeon driver does
Xorg's GeForce driver is nearly ok now, but when using the integrated
graphics there was less MIDI jitter than for the new PCI express. Until
now the integrated Radeon causes less trouble than the new PCI express
Hopefully it will be better when using the proprietary GeForce driver.
For the Radeon the proprietary driver didn't work for Linux.
After doing some hacks for Suse 11.2/.3 amd64 I could carry them over
to 64 Studio 3.0-beta3.
64 Studio's startup now is ok, but GDM has got a much to low resolution.
I need to log in, without any visual control.
The desktop nearly is perfect. The settings are the wanted 1152 x 864 @
90 KHz. Unfortunately the real frequency is 89.9, but perhaps it's a bad
vertical frequency, that is shifting the screen to the right. Anyway, I
could adjust this by the monitor.
For the Radeon I only needed to push sometimes Ctrl + Alt + Backspace to
be able to enter the GDM of 64 Studio, can't say if this changed for the
For Suse I never had to do this, but now I need to push always Ctrl +
Alt + Backspace to log in a working Desktop for Suse. I don't need to do
it for 64 Studio.
Btw. for Karmic 32-bit and Windows XP Pro 32-bit the frequency for the
monitor, when using the Radeon was 100 Hz, while for the 64-bit Suse and
64 Studio it was 90 KHz.
Before I try to fix the outstanding issues for 64 Studio, resp. to test
the proprietary driver I run Fons JACK MIDI jitter test.
spinymouse-sudo@64studio:~$ uname -r
spinymouse-sudo@64studio:~$ jackd -Rdalsa -dhw:0 -r96000 -p512 -n2 -Xseq
spinymouse-sudo@64studio:~$ cpufreq-selector -g performance
Then I loop connected USB MIDI in to out and by QjackCtl:
jack_send out --> system midi_playback_3
system midi_capture_3 --> jack_recv in
The same test for the Radeon can be read at http://lalists.stanford.edu/lad/2010/03/0287.html.
Regular values for the Radeon were between 2395 and 2404 and for this GeForce test regular values were between 2396 and 2405.
For the Radeon there were 8 extreme deviating values and for the the GeForce there were 24 extreme deviating values.
For JACK MIDI the integrated graphics seems to cause less jitter than the PCI express graphics does.
Hm? When I used Suse's SaX2 the result was better than for 64 Studio. I
got the wanted resolution of 1152 x 864, but at 75 KHz instead of the
wanted 90 KHz. After startup GDM was ok, but the desktop was completely
unusable. I need to push several times Ctrl + Alt + Backspace to get
back to GDM, after this also the Desktop was ok. Because of this I
restored the original xorg.conf for the Radeon graphics and just changed
the following settings:
Now I get the wanted resolution of 1152 x 864 at the wanted 90 KHz. GDM
still is ok, unfortunately the Desktop after startup is still completely
broken, it's ok after pushing several times Ctrl + Alt + Backspace to
enter GDM again and then also the desktop is ok. Suse's xorg driver is
detecting the GeForce 7200 GS as a GeForce 7300 SE too.
Unfortunately Suse's xorg.conf is completely different to 64 Studio's
one, while for 64 Studio I didn't change more than I did change for