Dear Imre,
Thank you for your reply.
Am 30.06.25 um 09:41 schrieb Imre Deak:
On Sun, Jun 29, 2025 at 11:04:31PM +0200, Paul Menzel wrote:
Just a heads-up, that very likely, merging of branch *drm-fixes-2025-06-28*
causes flickering of the panel of the Intel Kaby Lake laptop Dell XPS 13
9360. 6.16.0-rc3 works fine, and with 6.16-rc3-00329-gdfba48a70cb6 the panel
flickers. I try to bisect, but maybe you already have an idea.
One possibility is:
a3ef3c2da675 ("drm/dp: Change AUX DPCD probe address from DPCD_REV to
LANE0_1_STATUS")
Yes, that is the one my bisection pinpointed.
Could you open a ticket for this and provide a drm.debug=0x10e log with
6.16-rc4 and try if the following commits in drm-tip fixes the issue?:
5281cbe0b55a ("drm/edid: Define the quirks in an enum list")
0b4aa85e8981 ("drm/edid: Add support for quirks visible to DRM core and
drivers")
b87ed522b364 ("drm/dp: Add an EDID quirk for the DPCD register access probe")
ed3648b9ec4c ("drm/i915/dp: Disable the AUX DPCD probe quirk if it's not
required")
I also pushed these to:
https://github.com/ideak/linux/commits/dpcd-probe-quirk
I created issue *[Regression] Panel flickering on Dell XPS 13 9360 with
drm-fixes-2025-06-28 merged (Linux 6.16-rc4)* [1], and will try your
proposed fixes later.
[…]
Kind regards,
Paul
[1]: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14558
