Same issue here and happens every time:
1. User 1 Login, open apps, go idle and screen locks
2. User 2 Login and open apps, go idle and screen locks
3. User 1 Selects 'Switch User' from top panel and screen goes black, mouse
pointer becomes 'X' and no progress
I log into tty1 shell (Alt+Ctrl+Fn+Win+F1 then login as sudoer) and use
the following alias (aptly named 'killer') command in .bashrc and supply
the username to kill all that user's processes:
ps -ef | grep $1 | grep -v grep | awk '{print $2}' | xargs kill -9
Then Alt+F7 and User 1 login prompt is available. Logging in reveals
all previously opened apps in working state.
Working on Dell XPS L421x Ultrabook Core i7 SSD which has both onboard
Intel Graphics and a discrete Nvidia Geforce card with the following
details from lspci and lshw -C video:
LSPCI
00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller
(rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor
PCI Express Root Port (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09)
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family
USB xHCI Host Controller (rev 04)
00:16.0 Communication controller: Intel Corporation 7 Series/C210 Series
Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family
USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family
High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI
Express Root Port 1 (rev c4)
00:1c.2 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI
Express Root Port 3 (rev c4)
00:1c.3 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI
Express Root Port 4 (rev c4)
00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family
USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation HM77 Express Chipset LPC Controller (rev
04)
00:1f.2 SATA controller: Intel Corporation 7 Series Chipset Family 6-port SATA
Controller [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 7 Series/C210 Series Chipset Family SMBus
Controller (rev 04)
01:00.0 3D controller: NVIDIA Corporation GF117M [GeForce 610M/710M/820M / GT
620M/625M/630M/720M] (rev a1)
07:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411
PCI Express Gigabit Ethernet Controller (rev 07)
08:00.0 Network controller: Intel Corporation Centrino Advanced-N 6235 (rev 24)
09:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5209 PCI
Express Card Reader (rev 01)
09:00.1 SD Host controller: Realtek Semiconductor Co., Ltd. RTS5209 PCI Express
Card Reader (rev 01)
LSHW
*-display
description: 3D controller
product: GF117M [GeForce 610M/710M/820M / GT 620M/625M/630M/720M]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:01:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list rom
configuration: driver=nouveau latency=0
resources: irq:48 memory:d0000000-d0ffffff memory:a0000000-afffffff
memory:b0000000-b1ffffff ioport:3000(size=128) memory:b2000000-b207ffff
*-display
description: VGA compatible controller
product: 3rd Gen Core processor Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:47 memory:d1000000-d13fffff memory:c0000000-cfffffff
ioport:4000(size=64)
Annoying to say the least but being able to kill the other user session and
restore at least one instance is viable for the time being
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https://bugs.launchpad.net/bugs/1297383
Title:
Gnome-shell desktop is just a white blank screen after switching users
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