Archive for June 6th, 2011

TPMS needs an urgency indicator

Right now, the TPMS sensor in your car’s tires can tell you if they’re underinflated, but not by how much or how urgent you need to inflate them. wouldn’t it be better if it could?

For example, a 33PSI tire at 28PSI would cause the TPMS light to come on and stay on. I could drive around all day on 28PSI and not have to worry too much, but what if that tire dropped to 15PSI, or even 10PSI, or less? I wouldn’t know until there was just a layer of rubber between my rim and the road — by then it would be too late.

TPMS should be improved to at least let you know if the tire pressure drops dangerously low, to separate that ‘put some air in your tires before you pull in the garage’ message from the ‘put some air in your tires NOW’ message. The ‘Check Engine’ light already does it (in a way). Oxygen sensor bad? Light comes on to annoy you. Something catastrophic happens? The light will actually start flashing.

I say the TPMS light out to flash or change to red if the tire pressure drops below 20PSI.

That’s my thoughts. What are yours?

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Ubuntu not booting with nVidia video on i3-i5-i7 Intel CPUs

Systems with i3/i5/i7 chipsets and nVidia video may experience Ubuntu not booting, and instead getting a blank screen with a flashing cursor or corrupt video display.

This seems to be an issue with some combination of kernel, video card, and nouveau driver, and appears to stem from the fact that the system technically has two sets of video hardware: that on the Intel CPU and the nVidia GPU.. While the Ubuntu developers work to get this corrected, there is a workaround to get you going.

When your system starts to boot up, hold the shift key to get to the GRUB menu, then press ‘e’ to edit the command line. Go to the kernel line (the line that starts with linux and has quiet splash in it) and press the ‘end’ key to scroll to the end of the line. Add nouveau.modeset=0 to the end of the line, then press F10 to boot.

After booting up, you can install the nVidia proprietary drivers and reboot and graphics will work great for you.

You can also permanently disable the nouveau module by running the following:

echo options nouveau modeset=0 | sudo tee -a /etc/modprobe.d/nouveau-kms.conf
sudo update-initramfs -u

You may experience a low-resolution splash or login screen. See my post nVidia proprietary drivers and low-resolution Plymouth splash screen for a solution to this.

See also: Troubleshooting Nouveau Drivers

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