[Intel-gfx] [PATCH RFC] Revert "drm/i915: Try to use fast+narrow link on eDP again and fall back to the old max strategy on failure"

[Paul Zimmerman]

On Mon, May 10, 2021 at 7:00 AM Timo Aaltonen <tjaalton at ubuntu.com> wrote:
>
> On 9.5.2021 7.43, Paul Zimmerman wrote:
> > This reverts commit 2bbd6dba84d44219387df051a1c799b7bac46099.
> >
> > Since 5.12-rc2, my Dell XPS-15 laptop has had a blank screen on boot.
> > The system seems to run fine other than having no display, I am able
> > to ssh into the machine. I don't see anything interesting in the dmesg
> > log. I bisected the problem down to this commit, and reverting it fixes
> > the problem.
>
> Have you tried with drm-tip? It has acca7762eb71bc0 which hopefully
> helps here.

I picked that one commit from the drm-tip tree (wasn't sure how to merge
the entire tree into the kernel) and can confirm that it does fix the problem.
Thank you! I hope the fix will be sent to Linus pretty soon, and it will need
backporting to the 5.12 kernel as well.

- Paul