Re: [PATCH] drm/amd/display: add module param to disable immediate vblank off

[Mario Limonciello <mario.limonciello@amd.com>]

On 2/11/26 4:07 AM, Christian König wrote:
> Dropping stable, putting Grep on BCC.
> 
> On 2/11/26 10:19, Greg KH wrote:
>> On Wed, Feb 11, 2026 at 08:45:29AM +0100, Michele Palazzi wrote:
>>> Add amdgpu.no_vblank_immediate parameter to optionally disable the
>>> immediate vblank disable path on DCN35+ non-PSR CRTCs. When set to 1,
>>> a 2-frame offdelay is used instead, matching the behavior used for
>>> older hardware and DGPUs.
>>
>> Please no more module parameters, this is not the 1990's with only one
>> one device in the system.  Please fix this the proper way.
> 
> I just wanted to write the same.
> 
> We can of course implement something in DAL/DC, but clearly not behind a module parameter.
> 
> Or is there any other negative consequence except for that the display blanking is delayed by ~40ms?
> 

If there is a strong enough interest in keeping something like this as a 
debugging mechanism, there is already an amdgpu.dcdebugmask parameter. 
This accepts a bitmask of debug bits.  Assign this functionality to a 
new bit.