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From:   Jani Nikula <jani.nikula@linux.intel.com>
To:     Paul Zimmerman <pauldzim@gmail.com>,
        Timo Aaltonen <tjaalton@ubuntu.com>
Cc:     Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@intel.com>,
        intel-gfx@lists.freedesktop.org, linux-kernel@vger.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"
In-Reply-To: <CADBGO7_cH2e1-zgVNvwVPRogqeFjTfJhKcuTfdF=xc_GoMmknA@mail.gmail.com>
Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo
References: <20210509044330.4655-1-pauldzim@gmail.com> <02957632-b050-f9eb-fcd8-75db9c92b8e0@ubuntu.com> <CADBGO7_cH2e1-zgVNvwVPRogqeFjTfJhKcuTfdF=xc_GoMmknA@mail.gmail.com>
Date:   Tue, 11 May 2021 15:55:28 +0300
Message-ID: <87a6p1v39b.fsf@intel.com>
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On Mon, 10 May 2021, Paul Zimmerman <pauldzim@gmail.com> wrote:
> On Mon, May 10, 2021 at 7:00 AM Timo Aaltonen <tjaalton@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.

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