linux-kernel - 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"

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Message-ID: <877dk5v37d.fsf@intel.com>
Date:   Tue, 11 May 2021 15:56:38 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Paul Zimmerman <pauldzim@...il.com>,
        Timo Aaltonen <tjaalton@...ntu.com>
Cc:     Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: 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"

On Tue, 11 May 2021, Jani Nikula <jani.nikula@...ux.intel.com> wrote:
> On Mon, 10 May 2021, Paul Zimmerman <pauldzim@...il.com> wrote:
>> On Mon, May 10, 2021 at 7:00 AM Timo Aaltonen <tjaalton@...ntu.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.
>
> 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