[Openchrome-devel] Testing kms_branch r941 on 2.6.38.8 kernel

[Natanael Copa]

On Mon, 08 Aug 2011 19:02:07 +0200
Xavier Bachelot <xavier at bachelot.org> wrote:

> On 08/08/2011 02:23 PM, Natanael Copa wrote:
> > Hi,
> >
> > Just a short feedback. I saw there was some commits in kms_branch
> > so I gave it a test run.
> >
> > I tested running it with no xorg.conf at all with the Alpine Linux
> > default kernel (2.6.38.8 + grsecurity patch). The result was that it
> > didn't start X at all.
> >
> > I am not sure what to expect from it at this point but it looks
> > like it depends on the kernel driver.
> >
> > What does look nice is that it detected the correct size of my
> > screen :)
> >
> > Attached is the Xorg.0.log.
> >
> > The lspci output:
> > 01:00.0 VGA compatible controller: VIA Technologies, Inc.
> > CN896/VN896/P4M900 [Chrome 9 HC] (rev 01)
> >
> > Thanks for working on this driver!
> > -nc
> >
> The via drm driver in mainline kernel doesn't know about the P4M900
> and thus is not loading. Then because of this, the X driver is
> returning an error to the xserver when trying to init the screen
> which is probably a bit too much, as drm should not be needed. From a
> quick glance, may be removing line 1469 in via_driver.c will get you
> further.

Indeed. Removing the removing that line makes Xorg start. Just lke with
the drm-openchrome kernel the CPU consumption is very high. X eats
constantly 20-80% CPU and logs show lots of:

[  7222.314] pSrc is NULL
[  7222.646] pSrc is NULL
[  7222.646] pSrc is NULL
[  7222.653] pSrc is NULL
[  7222.653] pSrc is NULL
[  7223.979] pSrc is NULL
[  7234.509] pSrc is NULL
[  7242.748] pSrc is NULL

Still, a step forward. Thanks!
-nc