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From: Sasha Levin <sashal@kernel.org>
To: stable@vger.kernel.org
Cc: "Sasha Levin" <sashal@kernel.org>,
	regressions@lists.linux.dev, intel-xe@lists.freedesktop.org,
	intel-gfx@lists.freedesktop.org, 吴涛 <rpwtsama@gmail.com>,
	"Ville Syrjala" <ville.syrjala@linux.intel.com>
Subject: Re: [REGRESSION] Panther Lake 8086:b082 internal eDP black after xe takeover since 7.1.6, still present in 7.1.8
Date: Fri, 14 Aug 2026 22:33:13 -0400	[thread overview]
Message-ID: <20260814193000.13@kernel.org> (raw)
In-Reply-To: <CAF38RzLOUW1ZB1f+Q2f9mhnYs+t4R2+UQA1PCihz_FKEu-nSew@mail.gmail.com>

> Known good: 7.1.5-arch1-2
> First known bad: 7.1.6-arch1-1
> Latest tested bad: 7.1.8
>
> When the xe driver takes over from the firmware framebuffer, the
> internal panel becomes completely black.
> Close and reopen the laptop lid.
> The internal panel starts working normally.

Thanks for the report. I believe the culprit is 2ee8dbd880b1 ("drm/i915/cdclk:
Fix up CDCLK_FREQ_DECIMAL without a full PLL re-enable"), which is in 7.1.6.

Mainline is affected in exactly the same way and there is no fix upstream yet,
so there is nothing for me to pick up.

-- 
Thanks,
Sasha

  reply	other threads:[~2026-08-15  2:33 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-08-13  1:46 [REGRESSION] Panther Lake 8086:b082 internal eDP black after xe takeover since 7.1.6, still present in 7.1.8 吴涛
2026-08-15  2:33 ` Sasha Levin [this message]
  -- strict thread matches above, loose matches on Subject: below --
2026-08-12 14:35 吴涛

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