Bug 106335

Summary:	i915.enable_rc6=0 is not respected in new kernels
Product:	xorg	Reporter:	klaus <klaus>
Component:	Driver/intel	Assignee:	Chris Wilson <chris>
Status:	CLOSED INVALID	QA Contact:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity:	critical
Priority:	medium	CC:	nicholas
Version:	unspecified
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description klaus@kolle.com 2018-05-01 15:30:52 UTC

Description of problem:
Until Fedora kernel version 4.15.17-300 the i915.enable_rc6=0 in the boot was respected and my screen did not flicker.

Version-Release number of selected component (if applicable):
4.16.3-200 and 4.16.5-200

How reproducible:
If I boot on the newer kernels my screen flickers

Steps to Reproduce:
1. Reboot do not select the old kernel
2.
3.

Actual results:
Flickering screen

Expected results:
No flickering

Additional info:
Laptop Yoga 910

Comment 1 Chris Wilson 2018-05-01 15:36:20 UTC

The flickering was never anything to do with rc6. Please file a bug report (DRM/Intel) about the flickering and provide a full drm.debug=0xe dmesg.

Comment 2 klaus@kolle.com 2018-05-01 15:38:06 UTC

Nevertheless it removed an anoing problem.

Please instruct me to produce the output ypu want.

|<

Comment 3 Jani Nikula 2018-05-02 15:06:53 UTC

Possibly related [1], please try the workarounds there.

For me the full path to pm_qos_latency_tolerance_us is 

/sys/devices/pci0000:00/0000:00:1d.0/0000:02:00.0/nvme/nvme0/power/pm_qos_latency_tolerance_us


[1] http://mid.mail-archive.com/87shaveb5b.fsf@intel.com

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