[git pull] drm for rc1

[Jesse Barnes]

"Dave Airlie" <airlied at gmail.com> wrote:

>On Tue, Jan 11, 2011 at 2:16 PM, Linus Torvalds
><torvalds at linux-foundation.org> wrote:
>> On Mon, Jan 10, 2011 at 2:59 PM, Dave Airlie <airlied at linux.ie>
>wrote:
>>> Highlights:
>>> core/drivers: add support for high precision vblank timestamps
>>> radeon: pageflipping support, Gen2 PCIE support
>>> nouveau: reworked VRAM and VM support
>>> intel: better ILK/SNB powersaving support, Full GTT support
>>
>> Lowlights: it's broken.
>>
>> I get millions of messages like:
>>
>>  ...
>>  [ 8482.000414] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck
>> timer elapsed... render ring idle [waiting on 30938, at 30938],
>missed
>> IRQ?
>>  [ 8485.918124] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck
>> timer elapsed... render ring idle [waiting on 31068, at 31068],
>missed
>> IRQ?
>>  [ 8487.926963] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck
>> timer elapsed... render ring idle [waiting on 31129, at 31129],
>missed
>> IRQ?
>>  ...
>>
>> and everything is very choppy. I assume it's the power saving thing
>> that broke again, but that's just a total random guess, I have
>nothing
>> to actually back that up with.
>>
>> It worked fine after boot, but those problems began at 8287.139375
>> (about two hours after boot - it may have coincided with screen
>saver,
>> but who knows?)  and have been happening constantly since. The
>machine
>> is not really usable, I'm writing this with annoying 2-second pauses
>> every once in a while.
>
>Okay I'll try and reproduce and curse Chris and Jesse, does booting
>with
>i915.powersave=0 help any?
>
>Dave.

Arg.  It's been ok on my ILK systems, but Chris has found some issues with out watermarking code iirc; apparently we're underflowing the display FIFO, causing all sorts of trouble.  If it works before the pull of Dave's tree, can you bisect?

Thanks,
--
Jesse Barnes, Intel Open Source Technology Center