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Re: kern/46596 (ehci interrupt storm triggered by VGA interrupt)
The following reply was made to PR kern/46596; it has been noted by GNATS.
From: =?UTF-8?B?SmFyb23DrXIgRG9sZcSNZWs=?= <jaromir.dolecek%gmail.com@localhost>
To: Andreas Gustafsson <gson%gson.org@localhost>
Cc: "gnats-bugs%NetBSD.org@localhost" <gnats-bugs%netbsd.org@localhost>
Subject: Re: kern/46596 (ehci interrupt storm triggered by VGA interrupt)
Date: Wed, 17 Jun 2020 11:11:45 +0200
Can you try to disable intelfb via userconf or boot and try with that,
to see how it behaves without the drm driver?
Le mer. 17 juin 2020 =C3=A0 11:07, Andreas Gustafsson <gson%gson.org@localhost> a =C3=
> I dug out the machine from storage and connected a VGA display using a
> passive DVI/VGA adapter plugged into the motherboard DVI port. My
> test consists of starting a "vmstat 1" and unplugging/replugging the
> adapter from the motherbord DVI port.
> I was unable to reproduce the bug using a -current USB live image, so
> apparently it has already been fixed, and as a result, I can't
> meaningfully test your patch.
> To narrow down the timeframe of the fix, I tried booting a couple of
> old install CDs and breaking out of sysinst to a shell to run the
> test. With a 6.1.5 CD, I could reproduce the bug (the vmstat
> interrupt column started showing 200000+ interrupts per second), but
> with a 7.1 install CD, I could not. Instead, the following kernel
> message was printed:
> drm: HPD interrupt storm detected on connector HDMI-A-1: switching from=
hotplug detection to polling
> With the -current live image, there is neither an interrupt store nor
> a kernel message.
> Andreas Gustafsson, gson%gson.org@localhost
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