More grist for the mill.
T60p - no issues Thinkpad Helix 2nd Gen. - had to raise bug #986822 as debian kernels were not configured for the newly re-written [5.4+] intel SST sound modules for Haswell & Broadwell. Buster's 4.19 worked with old drivers/modules, now resolved so sound is fine on Bullseye release kernel. Thinkpad Yoga 260 - only issue is the elan trackpoint periodically freezing for a few seconds. Passing pmouse.elantech_smbus=0 kernel parameter seems a fix. Regards......