Re: Issue or bug concerning DRRS on old i7-4980HQ

["René Herman" <rene.herman@gmail.com>]

On 01-08-2025 11:19, Jani Nikula wrote:

> On Thu, 31 Jul 2025, René Herman <rene.herman@gmail.com> wrote:
>> Here's that Ubuntu launchpad bug on freedesktop.org, but including a
>> possibly interesting fix from 5 months ago in the currently last comment:
>>
>> https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/3441
> 
> Might be useful to attach dmesg and VBT to the bug as described at [1].

Just in case: please note the freedesktop.org bug is not our bug but 
just a 4 year old same one. I also unfortunately don't have the hardware 
on hand, and it seems the person I am assisting with this can't due to 
vacation get to it right now.

Although I'm not a graphics/display person, seems to me it's more or 
less fixed by Arun Murthy (added to the To: list) in the last, still 
recent-ish comment on that bug?

https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/3441#note_2803858

I.e., could while working with the person with the hardware not figure 
out what the point of that i915_drrs_ctl would be if the system 
immediately enabled it again anyway, so Arun's approach seems to make 
sense to me.

This is probably going to be a more common issue soon when these older 
no-TPM Haswell systems get installed with Linux at the end of Windows 10 
support.

Regards,
Rene