[K12OSN] drm i915_hangcheck_elapsed on client

Justin Lunning jlunning at new.org
Mon Sep 12 16:40:21 UTC 2011

Hi Roland,

I've seen a similar message too many times to count.  I don't use RHEL, 
but have seen it a lot with Ubuntu/Debian LTSP setups that we deploy.  
There are bugs in the Linux Intel Graphics driver that cause this.  
There are a number of adjustments you can make to try and remedy this, 
including upgrading/downgrading both the kernel and the intel graphics 
driver and adjusting acceleration options in custom xorg.conf files for 
your thin client, but it's a mixed bag.  You basically just have to try 
different combinations of adjustments until you find something that 
works.  Different techniques seem to have different mileage on different 
hardware.  It can be very time consuming.  If you google the error 
message you'll find a lot of info about.

Justin Lunning
npServ Director
NEW (Nonprofit Enterprise at Work)
jlunning at new.org / www.new.org
(734) 998-0160 x 212 (Ann Arbor)
(313) 887-7788 x 212 (Detroit)
Ann Arbor: The NEW Center, 1100 N. Main Street
Detroit: Hannan House, 4750 Woodward Ave

On 9/7/2011 11:27 AM, Roland Roberts wrote:
> I've had my client freeze up, temporarily, a number of times. Not 
> every day, not with high-frequency, but more than once a week.  Today, 
> after it recovered, I launched a local xterm and found this in 
> /var/log/messages
> Sep  7 11:05:08 client-192 kernel: [drm:i915_hangcheck_elapsed] 
> *ERROR* Hangcheck timer elapsed... GPU idle, missed IRQ.
> The previous log message is from the previous evening, the next if 
> from me lauching the local xterm.
> The client is a Thinkpad 420s with a Core i5 and the integrated Intel 
> GPU. Since that's a new addition for RHEL/SL 6.1, it's probably not 
> client related, but I thought I'd bounce it around here first.
> roland

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