Bug 86431

Summary:	[ivb] WARNING at drivers/gpu/drm/i915/intel_pm.c:5997 intel_display_power_put
Product:	Drivers	Reporter:	brent s. (brent.saner)
Component:	Video(DRI - Intel)	Assignee:	intel-gfx-bugs (intel-gfx-bugs)
Status:	RESOLVED CODE_FIX
Severity:	blocking	CC:	alan, alexdeucher, intel-gfx-bugs
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	>= 3.16.0	Subsystem:
Regression:	Yes	Bisected commit-id:
Bug Depends on:
Bug Blocks:	84221
Attachments:	dmesg output on 3.16.4-1

Description brent s. 2014-10-16 21:42:58 UTC

In kernels >= 3.17, my AMD GPU does not seem to initialize.

For full background (including lspci output, dmesg, symptoms, acpidump, bisection, and other pertinent info), please see bug #84221
Specifically, in addition to the attachments and description, see comment 23, 24, 25.

Comment 1 Alex Deucher 2014-10-16 22:28:09 UTC

Please attach your full dmesg output (I couldn't find it on the other bug report).  Note that the AMD card is not connected to the laptop panel.  The AMD card is purely for offload rendering (e.g., AMD card renders a game and then the frame is sent to the Intel card for display).

Comment 2 brent s. 2014-10-16 22:36:12 UTC

Created attachment 154051 [details]
dmesg output on 3.16.4-1

Comment 3 brent s. 2014-10-16 22:39:23 UTC

Dmesg output attached.

The panel isn't attached to the AMD card? The ACPI issues in the other bug seem related to AMD, and it affects the display, even in TTY, so I had thought otherwise.

Let me know if you need any other output

Comment 4 Alex Deucher 2014-10-16 22:48:01 UTC

The radeon driver has initialized fine.  There are no displays wired to the radeon card at all.  It's purely for rendering offload.  If you are not getting a display it's an issue with the intel driver.

Comment 5 Alan 2014-10-23 13:46:31 UTC

(moved to Intel side)

Comment 6 Jani Nikula 2015-01-28 15:08:51 UTC

We seem to have neglected this bug a bit, apologies. Is this still an issue with recent kernels? Please attach dmesg with drm.debug=14 module parameter set. Thanks.

Comment 7 brent s. 2015-01-28 15:35:06 UTC

Actually, my apologies- I think this can be closed.

it seemed to be related to bug #84221 (which was then tracked in bug #84561). that's been fixed and incorporated into commit 7d0b93499f4879ddbc75d594f4ea216ba964f78e

that hasn't hit mainline as of 3.18.2 but it does seem to be in mainline stable: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7d0b93499f4879ddbc75d594f4ea216ba964f78e (unfortunately i'm on a low-bandwidth connection so i can't clone the repo and see which tag it's under, and i'm not sure how to do that with cgit...)

BUT the display is working properly with that commit. I think it's solving this bug as well, but can't check at the moment. I'll test later tonight and let you know!

Comment 8 Jani Nikula 2015-01-28 15:42:18 UTC

Thanks, I'll close the bug - please reopen if the bug is still present.