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Message-ID: <2a3bac9bb3c85791a0b2d988020917f7609a7097.camel@linux.ibm.com>
Subject: AST2500 video engine for KVM trips BMC watchdog
From: Eddie James <eajames@linux.ibm.com>
To: openbmc@lists.ozlabs.org
Date: Fri, 13 Aug 2021 15:37:45 -0500
Organization: IBM
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I'm trying to solve a problem when the screensaver on the host is
activated. It seems to continually trigger the mode detection interrupt
on the BMC. In combination with the user-space application continually
trying to determine the resolution, it trips the BMC kernel watchdog
and resets the system. Here are the logs I've captured:

[ 2049.076692] aspeed-video 1e700000.video: Resolution changed;
resetting
[ 2050.091133] aspeed-video 1e700000.video: Timed out; first mode
detect
[ 2051.121593] aspeed-video 1e700000.video: Timed out when stopping
streaming
[ 2052.121203] aspeed-video 1e700000.video: Timed out; first mode
detect
[ 2052.393164] aspeed-video 1e700000.video: Got resolution: 1024x768
[ 2052.399561] aspeed-video 1e700000.video: Max compressed size: 80000
[ 2053.343096] aspeed-video 1e700000.video: Resolution changed;
resetting
[ 2053.350151] aspeed-video 1e700000.video: Engine busy; don't start
frame
[ 2054.361159] aspeed-video 1e700000.video: Timed out; first mode
detect
[ 2054.609677] aspeed-video 1e700000.video: Got resolution: 1024x768
[ 2054.615983] aspeed-video 1e700000.video: Max compressed size: 80000
[ 2055.409583] aspeed-video 1e700000.video: Resolution changed;
resetting
[ 2055.432802] aspeed-video 1e700000.video: No signal; don't start
frame
[ 2056.421155] aspeed-video 1e700000.video: Timed out; first mode
detect
[ 2056.676215] aspeed-video 1e700000.video: Got resolution: 1024x768
[ 2056.682516] aspeed-video 1e700000.video: Max compressed size: 80000
[ 2057.459454] aspeed-video 1e700000.video: Resolution changed;
resetting
[ 2057.480919] aspeed-video 1e700000.video: No signal; don't start
frame
[ 2058.471187] aspeed-video 1e700000.video: Timed out; first mode
detect
[ 2058.726108] aspeed-video 1e700000.video: Got resolution: 1024x768
[ 2058.732382] aspeed-video 1e700000.video: Max compressed size: 80000
[ 2059.526704] aspeed-video 1e700000.video: Resolution changed;
resetting
[ 2059.548747] aspeed-video 1e700000.video: No signal; don't start
frame
[ 2060.541146] aspeed-video 1e700000.video: Timed out; first mode
detect
[ 2060.792620] aspeed-video 1e700000.video: Got resolution: 1024x768
[ 2060.798801] aspeed-video 1e700000.video: Max compressed size: 80000
[ 2061.592870] aspeed-video 1e700000.video: Resolution changed;
resetting
[ 2061.615523] aspeed-video 1e700000.video: No signal; don't start
frame
[ 2062.611126] aspeed-video 1e700000.video: Timed out; first mode
detect
[ 2062.859185] aspeed-video 1e700000.video: Got resolution: 1024x768
[ 2062.865483] aspeed-video 1e700000.video: Max compressed size: 80000
[ 2063.659056] aspeed-video 1e700000.video: Resolution changed;
resetting
[ 2063.680423] aspeed-video 1e700000.video: No signal; don't start
frame
[ 2064.671148] aspeed-video 1e700000.video: Timed out; first mode
detect
[ 2064.925696] aspeed-video 1e700000.video: Got resolution: 1024x768
[ 2064.931949] aspeed-video 1e700000.video: Max compressed size: 80000
[ 2065.708903] aspeed-video 1e700000.video: Resolution changed;
resetting
[ 2065.716196] aspeed-video 1e700000.video: Engine busy; don't start
frame
[ 2066.721161] aspeed-video 1e700000.video: Timed out; first mode
detect
[ 2066.975563] aspeed-video 1e700000.video: Got resolution: 1024x768
[ 2066.981842] aspeed-video 1e700000.video: Max compressed size: 80000
[ 2067.758808] aspeed-video 1e700000.video: Resolution changed;
resetting
[ 2067.766511] aspeed-video 1e700000.video: Engine busy; don't start
frame
[ 2068.771128] aspeed-video 1e700000.video: Timed out; first mode
detect
[ 2069.025462] aspeed-video 1e700000.video: Got resolution: 1024x768
[ 2069.031803] aspeed-video 1e700000.video: Max compressed size: 80000
[ 2069.808665] aspeed-video 1e700000.video: Resolution changed;
resetting

Jae, or anyone else, do you have any ideas to solve this? I'm surprised
it's enough to stop pinging the watchdog, but that is what happens...

Thanks,
Eddie