Re: [BUG] xe: Meteor Lake 7d55 eDP PHY A/DPLL state mismatch, flip_done timeout

[Jani Nikula <jani.nikula@linux.intel.com>]

On Thu, 21 May 2026, Marco Nenciarini <mnencia@kcore.it> wrote:
> Cross-reference: Aaron Esau (Cc'd) posted a 3-patch series targeting
> this on intel-gfx@ on 2026-05-09 [1]. The series received pushback
> from Imre, Jani N, and Mika arguing for catching the failure pre-commit
> so the atomic_commit can fail cleanly at check time rather than
> mid-commit. The series is currently stalled. With Jakub's report,
> Aaron's report, and mine, the bug reproduces on at least three
> independent setups across i915 and xe, ARL-H and MTL, with and without
> an active NVIDIA driver.
>
> On the NVIDIA framing: Aaron's cover letter attributed the MSGBUS
> unresponsiveness to the NVIDIA dGPU not participating in S0ix
> (NVreg_EnableS0ixPowerManagement). That framing has two cracks. My
> reproduction has S0ix participation enabled AND NVIDIA runtime PM
> fully disabled (NVreg_DynamicPowerManagement=0x00, dGPU stays in D0
> since boot, never enters D3), yet the bug still fires. Jakub's setup
> has xe forcing the iGPU and no active NVIDIA driver in dmesg. So
> whatever platform-side condition causes the PHY to wedge, the NVIDIA
> module parameters are not the lever, and the bug occurs without an
> active NVIDIA driver. The fix has to be on the i915/xe side.

Looks like Jakub sent the same message twice. I replied to the other one
[1], with references to existing gitlab issues.

I'll reiterate that 1) any combo with an out-of-tree module loaded gets
no priority, 2) MTL/ARL with the xe driver doesn't get much priority,
and 3) the proposed series from Aaron is not viable.

That said, it does look like a regression with MTL/ARL and the i915
driver and without out-of-tree modules loaded, and we're looking into
it.


BR,
Jani.


[1] https://lore.kernel.org/r/fb38414a888f689b96135f65706c2125059e53ca@intel.com

-- 
Jani Nikula, Intel