Bug#944092: linux-image-5.3.0-1-amd64: i915 gpu hang, system freezes for seconds every few minutes

From	Philipp Marek <philipp@marek.priv.at>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#944092: linux-image-5.3.0-1-amd64: i915 gpu hang, system freezes for seconds every few minutes
Date	2021-05-02 10:10 +0200
Message-ID	<CafkS-6MH-3@gated-at.bofh.it> (permalink)
References	<yYFhD-6ao-15@gated-at.bofh.it> <C9GQa-2NJ-5@gated-at.bofh.it> <yYFhD-6ao-15@gated-at.bofh.it> <C9GQa-2NJ-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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With 5.10.0-6-amd64 I don't have this message anymore;
when resuming there's a few seconds wait before the screensaver
login window comes up, and I get these messages in kern.log:

	[145941.159088] i915 0000:00:02.0: [drm] *ERROR* Link Training 
Unsuccessful
	[145941.367056] i915 0000:00:02.0: [drm] *ERROR* Link Training 
Unsuccessful
	[145941.588149] i915 0000:00:02.0: [drm] *ERROR* Link Training 
Unsuccessful
	[145941.806389] i915 0000:00:02.0: [drm] *ERROR* Link Training 
Unsuccessful
	[145941.836878] i915 0000:00:02.0: [drm] *ERROR* CPU pipe B FIFO 
underrun
	[145942.021809] i915 0000:00:02.0: [drm] *ERROR* Link Training 
Unsuccessful
	[145942.236937] i915 0000:00:02.0: [drm] *ERROR* Link Training 
Unsuccessful

Perhaps that's related.

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Bug#944092: linux-image-5.3.0-1-amd64: i915 gpu hang, system freezes for seconds every few minutes Salvatore Bonaccorso <carnil@debian.org> - 2021-04-30 21:20 +0200
  Bug#944092: linux-image-5.3.0-1-amd64: i915 gpu hang, system freezes for seconds every few minutes Philipp Marek <philipp@marek.priv.at> - 2021-05-02 10:10 +0200

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