Final Maverick i830, i845g, i855 support

Christopher James Halse Rogers raof at ubuntu.com
Fri Sep 17 10:43:39 BST 2010


On Wed, 2010-09-15 at 09:11 -0700, Leann Ogasawara wrote:
> On Tue, 2010-09-14 at 09:19 -0700, Leann Ogasawara wrote:
> > On Mon, 2010-09-13 at 11:20 +1000, Christopher James Halse Rogers wrote:
> > > Hello again!
> > > 
> > > For Lucid we asked the kernel team to blacklist KMS on i830, i845 & i855
> > > to try to work around the instability in the intel drivers on those
> > > cards.
> > > 
> > > This instability (while, apparently, slightly reduced by the 2.12 DDX)
> > > is still present in Maverick, so I asked the kernel team to re-enable
> > > the blacklist in a recent upload.
> > > 
> > > Since we've got the 2.12 DDX with no userspace modesetting support, that
> > > means that these chips should get vesa.  There's an issue¹ with X
> > > actually loading vesa rather than fbdev or intel which I need to
> > > investigate which is preventing this from happening now.
> > > 
> > > The other option for these cards is to use KMS + the fbdev driver².
> > > 
> > > There have been a couple of concerns raised about vesa:
> > >  * Possibly less capable of proper suspend/resume than KMS.
> > >  * Won't drive the display in the native mode for laptops with a
> > > poorly-written video bios.
> > > 
> > > fbdev+KMS will work where ever KMS works, and will set the native mode
> > > where ever KMS sets the native mode.  It is not capable of changing
> > > resolution, however.
> > > 
> > > I've been persuaded that fbdev+KMS will provide a better experience for
> > > more people than kms-blacklist+vesa.  This is a final call for comment
> > > before I ask the kernel team to revert the blacklist for these cards and
> > > flick the switch in xorg-server to use fbdev rather than intel.
> > 
> > Hi Chris,
> > 
> > Just wanted to get your final recommendation if we, the Ubuntu kernel
> > team, should revert the KMS disablement patches.  Let us know asap, as
> > we hit Kernel Freeze this Thurs, Sept 16.
> 
> Given our time constraints to make Kernel Freeze, I've reverted the KMS
> disablement patches in the Ubuntu kernel for Maverick per the following
> conversation in #ubuntu-kernel on FreeNode:
> 
> <ogasawara> has anyone seen RAOF about?
> <vanhoof> Sarvatt: ^^
> <Sarvatt> RAOF is at the X developers summit
> <ogasawara> Sarvatt: maybe you can answer my question then... I need to know if we need to drop those KMS disablement patches from the kernel.
> <Sarvatt> yeah, we've already switched the server to use fbdev
> <ogasawara> Sarvatt: ok cool, I'll drop the patches then.  thanks.
> <Sarvatt> well, xserver with the change isn't uploaded yet, he didn't find a sponsor before he had to get on the plane
> <Sarvatt> but he does intend for those to go away yeah
> <apw> Sarvatt, if we don't drop them today and upload them they won't make the release ...
> <apw> kernel freeze is tommorrow
> * Sarvatt nods
> 

ACK.

Thanks for confirming this Robert.
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