[Bug 111805] Constant "Resetting rcs0 for hang on rcs0" and machine lockup

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111805

--- Comment #23 from Kenneth C <kenny at panix.com> ---
(In reply to Lakshmi from comment #21)

> Can you also attach the full dmesg from boot with kernel parameters drm.debug=0x1e log_buf_len=4M ?

Guys, I appreciate the work and effort being done in the i915 driver (I've
spent a lot of time looking at the code thinking I could help fix this and it's
highly complex) but it's been three weeks now and this regression is killing my
workflow- so I "fixed" the issue by reverting Sept 19th's drm-next merge from
Linus' master[1], and I've had reliable operation again for days now.

I'll keep watching for the next DRM update, and I really hope this is happening
in enough places to give you guys and idea of what's been happening so it can
get fixed, but I can't beta-test this code any longer ... sorry.

I still have the branch with the faulty DRM code and the next time I reboot
I'll try to remember to add "drm.debug=0x1e" to the cmdline and boot the faulty
branch, though so I can upload the dmesg.




[1] - Turned out to be less painful than I'd thought, too- if anyone else needs
to do this, it's "git revert  -m 1 574cc4539762", checking out to "HEAD" of all
the conflicted devices not i915, fixing up a minor conflict in .../i915/ and
cherry-picking 72e67f0463

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