Dell XPS 13 9300 4K UHD Laptop Review: 16:10 is the New 16:9

[robgoren]

Just got this tesponse from Dell re: PWM:

"I have reached out to my team and they confirmed that all of our notebooks backlight control interface are PWM including the XPS 9300."

I'm not sure what to believe now, because Dell Tech support told me a minths ago the AUO 9380 did not use PWM. Manufacturers should be required to disclose PWM info.

[robgoren]

I just received a call from a Dell Tech who confirmed that both the UHD panels on the 13.4" 9300 and the 7390 2-in-1 are the same, and DO NOT use PWM.

He also said that only the FHD panels use PWM.

[Craig S Paddock]

Does disabling 4k mode on 4k screen extend battery life to match FHD version?

[Benjamin Herzig]

Does disabling 4k mode on 4k screen extend battery life to match FHD version?

No. Battery life is worse on the 4K version, because 4K screens require a stronger backlight to reach the same level of brightness as FHD screens. This does not change if you lower the resolution.