Update worked well on my desktop, but broke on my laptop.
Same issue as described before:
- conflict regarding lib32-mesa on the second phase of the update
- no other application can start
- black screen upon forced reboot
I had to chroot from a live USB, following this thread: How to save your Manjaro installation when it breaks
(Only difference is i used gparted instead of lsblk in order to find the right partition to mount. Can't we have the labels with it?)
And then:
sudo pacman -Syyuu (fails because of conflict)
sudo pacman -S lib32-mesa
sudo pacman -S mhwd
sudo pacman -Syu
Then reboot. 
If it can help, here are my specs for my desktop (update worked) ...
System: Host: CManj-maycne Kernel: 4.4.59-1-MANJARO x86_64 (64 bit gcc: 6.3.1)
Desktop: Xfce 4.12.3 (Gtk 2.24.31) Distro: Manjaro Linux
Machine: Device: desktop Mobo: MSI model: Z77A-G45 (MS-7752) v: 1.0
BIOS: American Megatrends v: V2.6 date: 09/04/2012
CPU: Quad core Intel Core i5-3470 (-MCP-) cache: 6144 KB
flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 25608
clock speeds: max: 3600 MHz 1: 2142 MHz 2: 2093 MHz 3: 2060 MHz
4: 2254 MHz
Graphics: Card: NVIDIA GK104 [GeForce GTX 660 Ti] bus-ID: 01:00.0
Display Server: X.Org 1.19.3 driver: nvidia
Resolution: 1920x1080@60.00hz
GLX Renderer: GeForce GTX 660 Ti/PCIe/SSE2
GLX Version: 4.5.0 NVIDIA 375.39 Direct Rendering: Yes
Audio: Card-1 Intel 7 Series/C216 Family High Definition Audio Controller
driver: snd_hda_intel bus-ID: 00:1b.0
Card-2 NVIDIA GK104 HDMI Audio Controller
driver: snd_hda_intel bus-ID: 01:00.1
Sound: Advanced Linux Sound Architecture v: k4.4.59-1-MANJARO
Network: Card: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
driver: r8169 v: 2.3LK-NAPI port: d000 bus-ID: 03:00.0
IF: enp3s0 state: up speed: 1000 Mbps duplex: full mac: <filter>
Drives: HDD Total Size: 8251.6GB (59.4% used)
ID-1: /dev/sdb model: Samsung_SSD_840 size: 250.1GB
ID-2: /dev/sda model: WDC_WD20EZRZ size: 2000.4GB
ID-3: /dev/sdd model: ST4000DM000 size: 4000.8GB
ID-4: /dev/sdc model: ST2000DM001 size: 2000.4GB
Partition: ID-1: / size: 49G used: 32G (66%) fs: ext4 dev: /dev/sdb2
ID-2: /home size: 1.8T used: 1.5T (88%) fs: ext4 dev: /dev/sda1
ID-3: swap-1 size: 8.59GB used: 0.00GB (0%) fs: swap dev: /dev/sda2
Sensors: System Temperatures: cpu: 29.8C mobo: 27.8C gpu: 0.0:35C
Fan Speeds (in rpm): cpu: N/A
Info: Processes: 176 Uptime: 4:06 Memory: 2929.0/7933.0MB
Init: systemd Gcc sys: 6.3.1
Client: Shell (bash 4.4.121) inxi: 2.3.8
... the specs for my laptop (update failed).
System: Host: ROG-73JH Kernel: 4.4.59-1-MANJARO x86_64 (64 bit gcc:
6.3.1)
Desktop: Xfce 4.12.3 (Gtk 2.24.31) Distro: Manjaro Linux
Machine: Device: laptop System: ASUSTeK product: G73Jh v: 1.0
Mobo: ASUSTeK model: G73Jh v: 1.0
BIOS: American Megatrends v: G73Jh.213 date: 01/27/2011
Battery BAT0: charge: 0.0 Wh 0.0% condition: 73.9/78.0 Wh (95%)
model: ASUSTek status: Charging
CPU: Quad core Intel Core i7 Q 720 (-HT-MCP-) cache: 6144 KB
flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips:
12775
clock speeds: max: 1600 MHz 1: 1066 MHz 2: 933 MHz 3: 1066
MHz
4: 1066 MHz 5: 1466 MHz 6: 933 MHz 7: 1066 MHz 8: 933 MHz
Graphics: Card: Advanced Micro Devices [AMD/ATI] Broadway XT [Mobility
Radeon HD 5870]
bus-ID: 01:00.0
Display Server: X.Org 1.19.3 driver: radeon
Resolution: 1920x1080@60.01hz
GLX Renderer: Gallium 0.4 on AMD JUNIPER (DRM 2.43.0 /
4.4.59-1-MANJARO, LLVM 3.9.1)
GLX Version: 3.0 Mesa 17.0.2 Direct Rendering: Yes
Audio: Card-1 Intel 5 Series/3400 Series High Definition Audio
driver: snd_hda_intel bus-ID: 00:1b.0
Card-2 Advanced Micro Devices [AMD/ATI] Juniper HDMI Audio
[Radeon HD 5700 Series]
driver: snd_hda_intel bus-ID: 01:00.1
Sound: Advanced Linux Sound Architecture v: k4.4.59-1-
MANJARO
Network: Card-1: Qualcomm Atheros AR9285 Wireless Network Adapter
(PCI-Express)
driver: ath9k bus-ID: 03:00.0
IF: wls1 state: down mac: <filter>
Card-2: Qualcomm Atheros AR8131 Gigabit Ethernet
driver: atl1c v: 1.0.1.1-NAPI port: a000 bus-ID: 04:00.0
IF: ens5 state: up speed: 1000 Mbps duplex: full mac:
<filter>
Drives: HDD Total Size: 1004.2GB (23.6% used)
ID-1: /dev/sda model: ST9500325AS size: 500.1GB
ID-2: /dev/sdb model: ST9500325AS size: 500.1GB
ID-3: USB /dev/sdc model: Storage_Media size: 4.0GB
Partition: ID-1: / size: 71G used: 22G (31%) fs: ext4 dev: /dev/sda6
ID-2: /home size: 459G used: 188G (42%) fs: ext4 dev:
/dev/sdb5
ID-3: swap-1 size: 13.12GB used: 0.00GB (0%) fs: swap dev:
/dev/sda5
Sensors: System Temperatures: cpu: 44.0C mobo: N/A gpu: 58.0
Fan Speeds (in rpm): cpu: N/A
Info: Processes: 211 Uptime: 13 min Memory: 712.2/5897.1MB
Init: systemd Gcc sys: 6.3.1
Client: Shell (bash 4.4.121) inxi: 2.3.8