Sorry for the delay. I've just installed the apparent latest kernel,
which is v4.9-rc1. So far, I haven't been able to reproduce the problem
with it, unlike previous kernels 4.8-rc2 and 4.4.0-{31,34,43}. Looks
like it might be fixed!
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Tags added: kernel-fixed-upstream
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https://bugs.launchpad.net/bugs/1612895
Title:
Display freezes on 2nd+subsequent logins
Status in linux package in Ubuntu:
Confirmed
Bug description:
First boot after a fresh install of 16.04 from the 16.04.1 amd64
desktop ISO, with 'download updates' enabled. This is alongside an
existing 14.04 installation, which continues to work flawlessly. In
particular, this issue cannot be reproduced there. (I've installed the
-lts-xenial kernel package there, so it's version 4.4.0.34.24, but NOT
the xorg ones.)
The first login on the new system worked fine. After simply logging
out and in again, the display freezes just after drawing my user's
desktop. (This first time, everything was drawn, but on subsequent
attempts the background was black and the top Unity panel was empty.)
The mouse cursor is movable, but no button or key presses are
recognized.
Eventually, I press Ctrl+Alt+F1. The mouse cursor disappears
immediately; the display stays frozen and otherwise unchanged. After
another two minutes or so of waiting, I am finally dumped to the
virtual tty, which works fine. At this point a couple of kernel stack
traces appear in dmesg (see below), with timestamps corresponding to
"just now," i.e. when the vty switch finally occurred.
Switching back to the X vty via Alt+F7 brings me back to the still-
frozen display, at which point all I can do is Ctrl+Alt+F1 and wait ~2
minutes again. Stopping, then starting the lightdm service brings me
back to a working login screen, but logging in just freezes right back
again. Finally, rebooting the system allows me to login to a working
desktop exactly once -- logging out and in again reproduces this
problem reliably.
The full dmesg is attached, but the short version is that stack traces
appear in pairs, summarized by the following lines on the first
occurrence:
[ 242.116429] WARNING: CPU: 2 PID: 2539 at
/build/linux-dcxD3m/linux-4.4.0/drivers/gpu/drm/drm_irq.c:1326
drm_wait_one_vblank+0x1b5/0x1c0 [drm]()
[ 242.116498] CPU: 2 PID: 2539 Comm: Xorg Not tainted 4.4.0-31-generic
#50-Ubuntu
and by the following, slightly different ones, on the second and
beyond:
[ 380.232443] WARNING: CPU: 1 PID: 4173 at
/build/linux-dcxD3m/linux-4.4.0/drivers/gpu/drm/i915/intel_display.c:3963
intel_crtc_wait_for_pending_flips+0x1e2/0x240 [i915]()
[ 380.232563] CPU: 1 PID: 4173 Comm: Xorg Tainted: G W
4.4.0-31-generic #50-Ubuntu
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-31-generic 4.4.0-31.50 [modified:
boot/vmlinuz-4.4.0-31-generic]
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: who 3445 F.... pulseaudio
CurrentDesktop: Unity
Date: Fri Aug 12 19:51:28 2016
HibernationDevice: RESUME=UUID=2065ee3e-d689-4432-a805-4a7822b06d0e
InstallationDate: Installed on 2016-08-13 (0 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64
(20160719)
MachineType: LENOVO 4236AR5
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-31-generic
root=UUID=093a7652-dfb2-4f9e-9ceb-23761b18c8ef ro quiet splash
RelatedPackageVersions:
linux-restricted-modules-4.4.0-31-generic N/A
linux-backports-modules-4.4.0-31-generic N/A
linux-firmware 1.157.2
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/31/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 83ET66WW (1.36 )
dmi.board.asset.tag: Not Available
dmi.board.name: 4236AR5
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvr83ET66WW(1.36):bd10/31/2011:svnLENOVO:pn4236AR5:pvrThinkPadT420:rvnLENOVO:rn4236AR5:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4236AR5
dmi.product.version: ThinkPad T420
dmi.sys.vendor: LENOVO
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