Re: [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"

[Jani Nikula]

On Mon, 10 May 2021, Paul Zimmerman <pauldzim@xxxxxxxxx> wrote:
> On Mon, May 10, 2021 at 7:00 AM Timo Aaltonen <tjaalton@xxxxxxxxxx> 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.

I've picked up 2bbd6dba84d4 ("drm/i915: Try to use fast+narrow link on
eDP again and fall back to the old max strategy on failure") to
drm-intel-fixes, and it should find itself in v5.13-rc2 and subsequently
v5.12 stable in the coming weeks.

BR,
Jani.


-- 
Jani Nikula, Intel Open Source Graphics Center