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[Bug 1047037] New: Wifi power management prevents X from starting
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Mon, 03 Jul 2017 10:38:06 +0000
  • Message-id: <bug-1047037-21960@http.bugzilla.opensuse.org/>
http://bugzilla.opensuse.org/show_bug.cgi?id=1047037


Bug ID: 1047037
Summary: Wifi power management prevents X from starting
Classification: openSUSE
Product: openSUSE Distribution
Version: Leap 42.2
Hardware: Other
OS: Other
Status: NEW
Severity: Normal
Priority: P5 - None
Component: Network
Assignee: bnc-team-screening@xxxxxxxxxxxxxxxxxxxxxx
Reporter: ginkobonsai@xxxxxx
QA Contact: qa-bugs@xxxxxxx
Found By: ---
Blocker: ---

My Dell Precision M3800 laptop runs on openSUSE Leap 42.2 with all patches
applied; it has XFCE (4.12) and lightdm (1.19.5-1.1) and uses NetworkManager
(1.0.12-4.3.1).

When the system boots, it tries to start lightdm / the X server and the screen
flashes a few times - but most of the time, lightdm crashes. If it doesn't
crash, authentication doesn't work correctly and I can't log in (I just get
kicked back to lightdm).

Somehow, this is caused by the power save mode on the wifi interface because I
can "work around" the problem: After booting, I have to log in as root and run
these commands:

iwconfig wlan0 power off
service network restart
telinit 3
telinit 5

Then, the X server comes up normally and I can log in and work.

Switching from NetworkManager to wicked and leaving the wifi device
unconfigured also leads to the X server starting normally - but a laptop
without wifi is kind of pointless and I need to be able to easily connect to
various networks.

I tried to find out how to disable the power management on the wifi device
permanently but couldn't figure it out. Is there a way to achieve this? While
it would be nice to have wifi with a working powersave mode, it's much more
elemental to me to have a normally starting X server, even if without
powersaving.

What switches on the powersave mode on the interface and how do I prevent it
from doing that?



lspci -v -s 06:00.0

06:00.0 Network controller: Intel Corporation Wireless 7260 (rev bb)
Subsystem: Intel Corporation Dual Band Wireless-AC 7260
Flags: bus master, fast devsel, latency 0, IRQ 33
Memory at ec900000 (64-bit, non-prefetchable) [size=8K]
Capabilities: [c8] Power Management version 3
Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [40] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Device Serial Number 10-4a-7d-ff-ff-c4-df-51
Capabilities: [14c] Latency Tolerance Reporting
Capabilities: [154] Vendor Specific Information: ID=cafe Rev=1 Len=014 <?>
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi


cat /sys/module/iwlwifi/parameters/power_save
N

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