[Intel-gfx] Picture stutter on i915 Graphics P630]

[Sebastian Andrzej Siewior]

On 2021-09-29 18:07:00 [+0200], Anton Lundin wrote:
> Hi.
Hi,

> While I was chasing some other bugs I tested 5.15-rc3-rt5 and noted your
> code e446c2038b58 ("drm/i915/gt: Use spin_lock_irq() instead of
> local_irq_disable() + spin_lock()") and noted that this patch created a
> lot of visual glitches, freeze-frames for about 0.5s every couple of
> seconds.
> 
> The card identifies itself as: (if that matters)
> Intel Corporation CoffeeLake-S GT2 [UHD Graphics P630] [8086:3e96]
> 
> Reverting that patch resolved quite a lot of the glitches but there are
> still a couple of minor ones left, that I'm trying to chase down.
> 
> 
> None of those glitches are there on the same workload on a regular
> 5.15-rc3 kernel.

You are talking about that commit and 5.15-rc3-rt5 with PREEMPT_RT
enabled?

> 
> //Anton

Sebastian