I noticed my external display constantly turning on and off (like with resolution changes) and randomly shaking (horizontal minimal left/right movement) unless a DRI app is active (ie. running DRI_PRIME=1 glxgears). Booting the system with i915.enable_rc6=0 removes the issue. The amd driver being the cause was ruled out in https://bugs.freedesktop.org/show_bug.cgi?id=100058 [mulander@napalm ~]$ uname -a Linux napalm 4.10.1-1-ARCH #1 SMP PREEMPT Sun Feb 26 21:08:53 UTC 2017 x86_64 GNU/Linux [mulander@napalm ~]$ lspci 00:00.0 Host bridge: Intel Corporation Haswell-ULT DRAM Controller (rev 0b) 00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b) 00:03.0 Audio device: Intel Corporation Haswell-ULT HD Audio Controller (rev 0b) 00:14.0 USB controller: Intel Corporation 8 Series USB xHCI HC (rev 04) 00:16.0 Communication controller: Intel Corporation 8 Series HECI #0 (rev 04) 00:1b.0 Audio device: Intel Corporation 8 Series HD Audio Controller (rev 04) 00:1c.0 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 3 (rev e4) 00:1c.3 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 4 (rev e4) 00:1c.4 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 5 (rev e4) 00:1d.0 USB controller: Intel Corporation 8 Series USB EHCI #1 (rev 04) 00:1f.0 ISA bridge: Intel Corporation 8 Series LPC Controller (rev 04) 00:1f.2 SATA controller: Intel Corporation 8 Series SATA Controller 1 [AHCI mode] (rev 04) 00:1f.3 SMBus: Intel Corporation 8 Series SMBus Controller (rev 04) 01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 10) 02:00.0 Network controller: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter (rev 01) 03:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Sun LE [Radeon HD 8550M / R5 M230]
It is unlikely that rc6 is the active ingredient here, but when disabling rc6 one of its side-effects is to disable runtime powermanagement.
Side note, all bets are off when setting non-default i915.enable_rc6 values.
Reporter, is this still valid?
(In reply to Jani Saarinen from comment #3) > Reporter, is this still valid? Changing to INVALID, if there is any new information related to this bug, please share the information and change to REOPEN. Thank you.
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