Bug#566669: xserver-xorg-core: VGA Arbitration prevents DRI starting
On 01/25/10 13:11, Michel Dänzer wrote:
> On Sun, 2010-01-24 at 15:00 +0000, Dick Middleton wrote:
>> Julien Cristau wrote:
>>
>>>> Following upgrade DRI is no longer enabled for display:
>>>>
>>>> (WW) RADEON(0): Direct rendering is not supported when VGA arb is
>>>> necessary for the device
>>>> (EE) RADEON(0): [dri] DRIScreenInit failed. Disabling DRI.
>>>>
>>> This is fixed with kernel mode setting, AIUI. I don't think it will be
>>> fixed for userspace mode setting.
>>
>> Thanks for that. radeon.modeset=1 kernel option works. However I get
>> no output on VTs.
>
> That's usually due to one of two things:
>
> * Your X driver doesn't support KMS (none of the radeon driver
> packages in Debian do, only upstream Git master), so it's
> touching the hardware directly behind the kernel's back.
> * The fbcon kernel module isn't loaded.
I can't fathom it all out! With modeset=1 DRI is still disabled (not
supported) but rendering performance is significantly improved. However
I get no VTs. If I set framebuffer and modeset=1 I can switch to a VT
once; if I switch back to X then back to VT I get no visible output.
Framebuffer (radeonfb) doesn't seem to work with modeset=1.
With modeset=0 framebuffer VTs work but X rendering is slow.
Anyway, if there's support for radeon KMS in GIT I'll wait for next
release.
Many thanks for your pointers.
Dick
--
Dick Middleton
dick@lingbrae.com
PGP Key ID: 0x9F9434FD
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