F12/Rawhide+nomodset vs. F11 radeon r700 support

[François Cami]

On Wed, 06 Jan 2010 03:28:36 +0100
"Dennis J." <dennisml at conversis.de> wrote:

> On 01/06/2010 12:18 AM, François Cami wrote:
> > On Tue, 05 Jan 2010 19:56:54 +0100
> > "Dennis J."<dennisml at conversis.de>  wrote:
> >
> >> On 01/05/2010 06:56 PM, Adam Williamson wrote:
> >>> On Tue, 2010-01-05 at 16:48 +0000, "Jóhann B. Guðmundsson" wrote:
> >>>> this is and the
> >>>> output from lspci
> >>>
> >>> there's no need for this on X.org bugs, the Xorg.0.log file contains
> >>> sufficient information on the graphics hardware.
> >>
> >> This bug seems to be both a KMS bug and a Xorg bug. I can get boot into
> >> runlevel 3 but the display isn't initialized properly and the only way I
> >> got some of the debug information attached to the bug was by blindly
> >> logging in, setting up sshd and then logging in from another machine.
> >>
> >> The second problem is that when I boot with nomodeset I get to the desktop
> >> but it is so slow it cannot be used for regular work. I'm not sure if that
> >> is a bug or because the radeon driver now requires KMS for any sort of 2D
> >> acceleration.
> >
> > On most radeons, both UMS and KMS are accelerated on Fedora 12.
> > That may not be the case for R700, and at any rate we'd rather have
> > the KMS codepath working than the older UMS.
> > If booting into KMS/runlevel 3 fails, it's a KMS problem, Xorg has no
> > way to recover from that.
> > On the other hand, your logs show both nouveau and radeon, as pointed
> > out by Jóhann. Could you try booting with the parameter:
> > nouveau.modeset=0
> > and report?
> 
> Success! Adding "nouveau.modeset=0" did the trick and the machine now boots 
> into runlevels 3 and 5 with the displays native resolution of 1920x1200. 
> Two things though:
> 
> 1. During boot I just got the same boring old progress bar at the bottom 
> that I also get on F11. Aren't I supposed to see a funky boot plugin with KMS?

Maybe plymouth and accompanying themes are not properly installed.
To recap:
Without nomodeset, but with nouveau.modeset=0, runlevels 3 and 5 do work.

> 2. While the performance is not as unusable as it was with "nomodeset" It's 
> still a lot worse compared to F11. I can barely play a youtube video. (eats 
> one of my two cpu cores almost completely whereas on F11 that takes about 
> 15% in "top")

Adding Jerome in CC. Jerome, is there anything we can do to trace performance
regression issues?

François