[Bug 106422] i915 time out with recent kernels: [drm_kms_helper] flip_done timed out

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106422

--- Comment #12 from Zakhar <alainb06 at free.fr> ---
@Jim Rees

Thanks, your suggestion #1 made the bug disappear... as far as I could see in
the log (the PC is remote ~1000km away, so I can't see what is happening on the
screen!)

I tested it both with the self compiled drm-debug kernel and with stock Ubuntu
4.15 kernel.
(I didn't test yet on current 3.13 since in 3.13 there are messages in the log
but no timeouts, so it is not really an issue)

The suggestion #2 seems very strange. Isn't it like running without the
specific intel driver? Sure when I add "nomodeset" (or use the "recovery" grub
options) that works fine with no time outs since we use no special video
driver. But then we loose graphic acceleration which I still want to keep. No
graphic acceleration is noticeable even in Firefox, and would not be a nice
option.


I don't completely accept the workaround just now, since I am not in front of
the PC and can't see by myself what are the side effects of this boot
parameter.

I will also have to find a clean way to make this boot parameter stick, even
when a new kernel is proposed on the Ubuntu repos... but I guess this is a
common issue unrelated to Intel drivers.


So the option #1 you propose Jim looks promising... sure it is not a fix but a
workaround!
I could anyway understand, considering the age of the hardware and how long it
has been "end of life" now, that fixing this issue is not Intel engineers
priority once I confirm the workaround.

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