Two USB ports stopped working

I have a HP pavillion g6, running Xubuntu 14.04 64-bit. I have 3 USB ports. For some reason, 2 of them stopped working this morning.

I have xserver-xorg-input-all installed, followed the instructions here which didn't work. My laptop is updated and upgraded to the latest version. lsusb outputs

Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 004: ID 0a5c:21e3 Broadcom Corp. HP Portable Valentine
Bus 001 Device 005: ID 2188:0ae1  
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

I tried on Manjaro live cd, and all ports are working. Isn't there an error log for usb ports so i can see whats going on?

My /var/log/dpkg.log and /var/log/apt/history.log are here

Here I got my USB3 ports not working after a while: only a restart fixes the problem.

After some research, I've found that a lot of USB3 ports presents a power management problem In a lot of different hardwares and OSs. You can find people reporting this kind of problem on Windows, Linux, etc.

So, I've disabled USB power management, and now everything is fine.

1. Disabling USB Power Management

For Ubuntu, usbcore module is compiled in the kernel, so we need to change the kernel boot parameters.

Edit the /etc/default/grub file and change the GRUB_CMDLINE_LINUX_DEFAULT line to add the usbcore.autosuspend=-1 option:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash usbcore.autosuspend=-1"

Note that quit splash were options already present. So keep other options you have too.

Save file and close.

2. Update grub

After save the file, update grub:

sudo update-grub

And reboot.

3. Check autosuspend after reboot

After reboot, check autosuspend value:

cat /sys/module/usbcore/parameters/autosuspend

And it should display -1.

I had a similar problem and http://www.ubuntugeek.com/how-to-fix-usb-stops-working-problem-in-ubuntu.html lists another way to fix this

This method also edits the grub but instead of modifying GRUB_CMDLINE_LINUX_DEFAULT it modifies GRUB_CMDLINE_LINUX="".

Steps:

1. Open terminal
2. Type gksudo gedit /etc/default/grub in terminal and press enter
3. Find the line GRUB_CMDLINE_LINUX=""
4. Modify the line to read GRUB_CMDLINE_LINUX="acpi=force irqpoll"
5. After that, update the bootloader via terminal by typing sudo update-grub and pressing enter
6. Restart your system

This method is the same as given in the link above and it worked for me.

I use Ubuntu Desktop 14.04 64 bit.