Please try again with http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/ - it should be fixed.

Thanks.
The last one I found in debian experimental was:
xserver-xorg-video-intel_2%3a2.99.917+git20151217
Is that too old? Which date was the patch added?
(that driver didn't SEGV but I've found the laptop locked up when I came back the next morning, although since it's locked up, it's hard to say what at's fault)

For now, I've come back to 2:2.99.917-1 which doesn't seem to hang or crash, but I'm happy to try the 

Thanks, Marc
(Merry Xmas)

Thanks.
The last one I found in debian experimental was:
xserver-xorg-video-intel_2%3a2.99.917+git20151217
Is that too old? Which date was the patch added?
(that driver didn't SEGV but I've found the laptop locked up when I came back the next morning, although since it's locked up, it's hard to say what at's fault)

For now, I've come back to 2:2.99.917-1 which doesn't seem to hang or crash, but I'm happy to try the 

Thanks, Marc
(Merry Xmas)

Thanks.
The last one I found in debian experimental was:
xserver-xorg-video-intel_2%3a2.99.917+git20151217
Is that too old? Which date was the patch added?
(that driver didn't SEGV but I've found the laptop locked up when I came back the next morning, although since it's locked up, it's hard to say what at's fault)

For now, I've come back to 2:2.99.917-1 which doesn't seem to hang or crash, but I'm happy to try the 

Thanks, Marc
(Merry Xmas)

Doh, sorry for the triple post. Bugzilla kept telling me that my post hadn't gone through, when in fact it was lying :(

1) xserver-xorg-video-intel  2:2.99.917-1 hung on 4.3.3
2) 2:2.99.917+git20151217-1~exp1 gave a full hang too on 4.1.15 (not even the mouse moving, power cycle required)

I'm now trying 2:2.99.917+git20151217-1~exp1 on 4.3.3 and next I'll go back to 2:2.99.917-1 with 4.1.15.
If there is a newer git version I should be trying let me know, but at least this one just hangs completely, it does not crash (maybe not better, but not a SEGV)

The crash is completely secondary to an underlying resource starvation bug, more than likely not from the ddx.

Thanks Chris, that makes sense.
I have a big screen (3K), that's why I bought that laptop.
The intel graphics has always felt underpowered for it, but now that I have it, I'll have to make do :)

Are there kernel / xorg options I can set to reduce performance and increase stability?
I could also run google-chrome with --disable-gpu, but that will kill some amount of sites that actually require hardware rendering.

Thank.

Ok, after more tests, more crashes, and more data lost:
The old xserver-xorg-video-intel 2:2.99.917-1 fails with 4.1.15 and 4.3.3 but when it does, my mouse keeps working, sound on an mplayer video keeps working (but no video), and I can switch back to a text console.
The X server does not come back to life though.

With 2:2.99.917+git20151217-1~exp1 , X server deadlocks, everything is lost, I need to power cycle (both with 4.1.15 and 4.3.3).

This is quite disappointing :(
I'm not running google-chrome-beta --disable-gpu to see if that helps.

Does the problem persist with the latest kernel and userspace bits?

(In reply to Jani Nikula from comment #9)
> Does the problem persist with the latest kernel and userspace bits?

Timeout, assuming that this is fixed by now. If this is not the case, please re-test with latest kernel & xf86-video-intel to see if this issue is still occurring since there were improvements pushed in kernel and xf86-video-intel that will benefit to your system.