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 Tue, 11 May 2021, Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx> wrote:
> 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.

I mean I've picked up acca7762eb71 ("drm/i915/dp: Use slow and wide link
training for everything").


>
> BR,
> Jani.

-- 
Jani Nikula, Intel Open Source Graphics Center