Created attachment 1408818 [details] phone picture of end of error spew I have been unable to successfully boot any of the 4.15.* kernels (have tried the released updates of 4.15.3, 4, 6, and 8) on my Thinkpad T430. kernel 4.14.18-300.fc27.x86_64 works just fine, as have a semi-infinite number before this (this vintage machine has served me well for many years). The boot crashes early on at the modeset step. This puts the laptop screen in un-backlit mode (which is the normal boot process for this machine, backlighting comes back later in the boot process). Thus, I have been unable to even read the kernel spew till now, when I discovered that if docked, the attached picture eventually shows up on the external monitor (like a minute later, no idea why it doesn't echo there from the get-go, as it does in a normal boot). This is not a docking bug: it does the same thing sitting on its own. So: now that there's finally some info to post, time to submit a bug report to get some help. It's complaining about the i915 module in the part we can see (can't page up back to see more), which make sense if it's actually related to the modeset. There is also a discrete nvidia card, but it isn't activated at this point: bumblebee brings that up later in X (which is way down the road, I boot to runlevel three even in when I'm not debugging). Let me know what other stuff might be helpful, don't want to spam here preemptively with all possible config info. When "nomodeset" is used, it will get to a runlevel 3 text login - then hang immediately upon entering a username. Nothing gets to the system log in either case, other than a string of "^@"'s. It appears the crash is taking out the disk controller for writes (obviously it can read ok to get to runlevel 3), as sometimes there are scsi errors upon reboot. Luckily trying a cold restart again clears this. Have tried setting up kdump, but no luck. It needs to talk to the disk to be able to dump, but it can't even syslog, so a full dump is right out. No serial port on this laptop with which to serial console, although I can track down a usb/serial converter if that has a chance of working. Ideas appreciated!
Your best bet is to file a bug at bugzilla.freedesktop.org
Reported to freedesktop.org here: https://bugs.freedesktop.org/show_bug.cgi?id=105811 A similar one might be hitting Ubuntu here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1751268 (sorry for the delay, travel intervened).
Hello fedora folks, In the freedesktop.org bug thread referenced above, we've debugged a lot, and found that things work OK with their debugging 4.16 tree, but still don't with the fedora 4.16 rc build from koji. They're ready to punt. My next question for you, to save me from having to hand compile and configure kernels for the rest of this laptop's life: any ideas what patches you as Fedora are applying to the mainline kernel that might be causing the problems (documented in detail now)? Thanks!
It's probably the opposite, there is something in the Free Desktop tree that hasn't yet made it into Linus' tree. If you can narrow down which patch it is we can bring it into Fedora.
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