R200 DRM/KMS

[Alex Deucher]

On Wed, Jul 8, 2015 at 8:58 AM, Steven Newbury <steve at snewbury.org.uk> wrote:
>
>
> On Tue Jul 7 15:12:28 2015 GMT+0100, Alex Deucher wrote:
>> On Tue, Jul 7, 2015 at 9:46 AM, Steven Newbury <steve at snewbury.org.uk> wrote:
>> >
>> > I've tried an xserver-1.16, and ddx, libdrm without LTO and with
>> > gcc4.9.  Exactly the same thing.  I wondered whether the unused i810
>> > could be interfering but triggering a device "remove" before starting
>> > X made no difference.
>> >
>> > I'm a bit of a loss.  I suppose I could try writing a simple test for
>> > drmSetInterfaceVersion().  At least that should determine whether the
>> > xserver/ddx is in the clear.
>> >
>> > Any other ideas?
>> >
>>
>> Can you start a non-X runlevel and start X manually as root (assuming
>> you are using a login manager now)?
>>
> My test program worked fine. I considerably improved it over the version I posted. I'll send it to the list when I get back.
>
> I removed the drmSetInterfaceVersion() from radeon_kms.c and it got much further.  Starting Xserver as root  apparently started normally, according to the log, although  there was a permission denied error on mode set during init. I don't know whether it was related or not, but the display then hung with a non-blinking cursor. Strange to get a permission denied as root!
>
> Starting GNOME via gdm gives a working slow X session but for some reason only uses sw dri even though the Xorg log shows r200 DRI2 as initialized. Perhaps it's a config error somewhere.. ?
>
> startx as a regular user just works!
>
> But mutter doesn't, perhaps that's
> why a gnome session isn't working. It just gives the following error:
> Cogl-ERROR **: Failed to create texture 2d due to size/format constraints
>
> Mutter is supposed to work on r200, right?

IIRC it tries to use a render buffer format that's not supported by the hw.

Alex