[Intel-gfx] i915: hotplug events gone wild

[Andrew Lutomirski]

On Sun, Jan 31, 2010 at 8:03 PM, ykzhao <yakui.zhao at intel.com> wrote:
> On Sun, 2010-01-31 at 19:49 +0800, Andrew Lutomirski wrote:
>> On Sat, Jan 30, 2010 at 10:02 PM, Andrew Lutomirski <luto at mit.edu> wrote:
>> > [I posted this bug earlier with a terrible description as "resume
>> > lagginess and other problems."  Here it is again with a better bug
>> > report.]
>> >
>> > I'm running 2.6.33-rc5 (plus some wireless-testing stuff, but I've
>> > seen this problem on a variety of 2.6.33-rc? kernels).  Every now and
>> > then, X starts to lag badly on my GM45 laptop.  When this happens, I
>> > usually see a bunch of events in udevmonitor.  Running with
>> > drm.debug=0x02 (and the patch below to keep the log under control), I
>> > see tons of messages like this:
>>
>> I triggered it again.  This time, the messages looked like
>> (drm.debug=3 from a different VT to avoid all the hotplug stuff
>> running off the screen, and running a different debugging hack -- see
>> all the way at the bottom):
>>
>> [ 1324.285057] [drm:i915_driver_irq_handler], hotplug event received,
>> stat 0x28200000, mask 0x38000800
>
> >From the stat value it seems that this is related with the HDMI hotplug.
> Will you please confirm whether th HDMI is pluged/unpluged in your test?

This is a Lenovo X200s, and it doesn't have HDMI.  I have LVDS on and
everything else (i.e. VGA and the docking station, which has a DP
port) disconnected.

--Andy