Issue or bug concerning DRRS on old i7-4980HQ
Jani Nikula
jani.nikula at linux.intel.com
Mon Aug 4 08:21:23 UTC 2025
On Sat, 02 Aug 2025, René Herman <rene.herman at gmail.com> wrote:
> On 01-08-2025 11:19, Jani Nikula wrote:
>
>> On Thu, 31 Jul 2025, René Herman <rene.herman at 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.
Hacking debugfs is not a fix, it's a hack.
> 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.
On the upside, we'll get more people with the hardware to test.
BR,
Jani.
--
Jani Nikula, Intel
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