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Skip to content Home About Contact Me Lecture Notes As you can guess my name is Guy Rutenberg, and I live in Tel Aviv, Israel. I look at the blog that you’re reading as a self-reference tool and a way to share with others useful and not so useful things I’ve wrote or found.
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Reverse Engineering the Concept2 Utility to Update PM5 Firmware on Linux
Concept2's PM5 monitor firmware can be updated via USB, but the official tool - Concept2 Utility - only runs on Windows. No Linux support, no documented protocol. I wanted to update my PM5 from my Debian machine, so I reverse engineered the Windows binary
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Web HR Monitor: Heart Rate and HRV in the Browser
I've been reading about HRV (Heart Rate Variability) for a while and wanted a way to record it on my computer and actually understand the underlying calculations, rather than just consume a number from a proprietary app. I also wanted an excuse to finally
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The Cost of Currency Hedging in TASE Index Funds
I wanted to quantify the actual cost of currency hedging (USD/ILS) for index-tracking ETFs and mutual funds on the Tel Aviv Stock Exchange (TASE). Many Israeli investors face the choice between hedged ("מנוטרלת מט"ח") and unhedged versions of the same fun
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USB Keyboard Not Working in Dracut When Connected via Thunderbolt Dock
My USB keyboard stopped working during the Dracut initramfs phase (e.g., at the LUKS password prompt) when connected through a Thunderbolt dock. It worked fine in GRUB, in GNOME, and when plugged directly into the laptop. It had also worked through the do
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Auto-switch power-profiles-daemon with udev
On GNOME with power-profiles-daemon, I wanted the power profile to switch between power-saver and performance based on AC power or battery. The solution is to let udev react to POWER_SUPPLY_ONLINE changes and call powerprofilesctl directly. Configuration
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