Hi,
I'm new to the forum, though I've been reading for a while.
I have a ProBook 4540s (the core i5 version, with no discrete GPU) running El Capitan that I installed some months ago using the old ProBook clover installer.
It worked rather well except that QE/CI stopped working after a couple of reboots.
I discovered that I could make it work again by booting on my install thumb drive and rebuilding the kext cache.
Unfortunately, that QE/CI issue used to come back quite often (I think every time the kext was rebuilt after booting on the main drive), which was rather annoying.
So yesterday I decided to update clover to the latest version and to transition to the new hotpatch setup to see if it would improve things.
Unfortunately, it did not solve the QE/CI issue, and I also stumbled on a couple of new problems that I'd like to report in this post.
The first problem is that after installing the new kexts, the laptop could not boot anymore because of a kernel panic caused by IntelBacklight.kext v1.0.10. I tried to replace that kext with older versions that I found here (
https://bitbucket.org/RehabMan/os-x-intel-backlight/downloads) and I finally had to revert to version v1.0.6 (v1.0.7 being the 1st version causing the crash).
BTW, I'm not even sure if this kext is useful for my laptop because during the boot I have the message "backlight handler never showed up". Does this means that the kext turned out to be useless ?
Second problem: yesterday, the laptop went to sleep while a USB drive was plugged. When the laptop woke up, I ejected the drive and this caused a system crash. Later I tried to reproduce that crash but the result was different: this time when the laptop woke up, MacOs complained that the drive was removed without being ejected (the drive being automatically remounted after that). I've been able to reproduce that later behavior several times in a row, but after another reboot everything was back to normal.
So there seems to be a erratic problem with regard to USB drives and sleep.