control: forwarded -1 https://bugs.freedesktop.org/show_bug.cgi?id=95176
❦ 24 juillet 2016 19:10 CEST, Bram Bolder <bb@fd0.org> :
> It was set to 1, changing it to 0 did not solve the problem (I stopped xdm,
> set the 0 and started it again).
>
> I did some further checking (kernel 4.5 has enable_psr=0 as default). I also
> noticed that producing load removed the flickering (e.g. glxgears). It's definitively
> a power saving feature.
>
> I then tried to set i915.enable_psr=0 as commandline option in grub and this solved
> my problem! Hooray!
>
>
> My question now is how to proceed with this problem. I'm quite sure that you don't want
> everyone with my (or a similar) hardware setup to file a bugreport to you. Maybe this
> problem gets fixes upstream at some point...
The functionality exists since quite some time but has been disabled
until 4.6. On my laptop (Haswell), it started working correctly from 4.6
too. Previous kernels where exhibiting the same problems that you
observed (but I was able to enable/disable this functionnality without
restarting anything). Therefore, it seems that upstream put some work
into this functionnality but it doesn't work for everyone.
> Do you want to close this ticket? The problem is solved for me, but
> maybe other users might experience the same problem.
I can't say, I am not the maintainer of the kernel in Debian, just a
user. You can try 4.7-rc7 in experimental. It seems the bug is already
reported upstream (and not solved in 4.7-rc7):
https://bugs.freedesktop.org/show_bug.cgi?id=96704
https://bugs.freedesktop.org/show_bug.cgi?id=96736
https://bugs.freedesktop.org/show_bug.cgi?id=96916
https://bugs.freedesktop.org/show_bug.cgi?id=95124
https://bugs.freedesktop.org/show_bug.cgi?id=95176
I mark the last one as a forwarded address for this bug (this seems the
most active one).
--
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