[arch-general] External monitors are no longer detected (Intel graphics)

[Genes Lists]

> Not only GPUs, but also WiFi cards. Got 8265 on Thinkpad T480 and 5G
> speeds are awful. When you're trying to download via 5G network
> something big - connection interrupts and won't come back until
> NetworkManager is restarted, also there are plenty of errors in dmesg.
> All fine on 5.0.x and LTS kernel (4.19.x), only 5.1.x are affected.

Check youor mesages and look for EDC asset. There is a fix teed up which
may help your case.

 I have seen this "EDC assert" issue with 8265 [1] and the fix is given
in comment #42.  I have tested it on kernel 5.2-rc7 and works fine.
This impacts all pre-9000 intel wifi cards.

This will NOT make it into 5.2, as Emmanual G points out, as its late in
the cycle; presumably will be in 5.2.1 and 5.3.

A work around you might try is to add this iwlwifi option - then reboot.

# cat >> /etc/modprobe.d/iwlwifi.conf
options iwlwifi swcrypto=1

regards,

gene

[1] https://bugzilla.kernel.org/show_bug.cgi?id=203315