With a 2500U, on any linux kernel (including drm-next) every few minutes/hours the system completely hangs, forcing a hard restart. The system throws me a ton of APCI errors after I tried updating the bios, but it still hung before this BIOS update. I will post journalctl -k output, Xorg log, and dmesg output. Let me know if you need more information, i'm willing to turn on debugging outputs.
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Journalctl -k output
I've disabled the PCI errors in the past, it does not stop the hangs.
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Journalctl -k -b 2 output
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Current Xorg log
for some reason xorg.log.1 is empty, I will have to post it some other time
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Have you tried booting with the 'idle=nomwait' kernel option? This worked for the submitter of similar bug #106670, and so far seems to have worked for me as well.