I could get i915 really verbose by drm.debug=0xe boot param. Having looked through the journal I found:
kernel: [drm:intel_psr_enable] PSR not supported by this panel kernel: [drm:intel_edp_drrs_enable] Panel doesn't support DRRS
i.e. PC3 is the best I can achieve on native resolution. I'm not going to run at a reduced resolution finally, but will give it a try to see if it makes any difference.
Power management, mobile and firmware developer on Linux. Security developer at nvidia. Ex-biologist. Content here should not be interpreted as the opinion of my employer. Also on Mastodon and Bluesky.
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Re: Thinkpad T540p i7-4700MQ didn't show any improvement
Date: 2016-04-19 01:44 pm (UTC)Having looked through the journal I found:
kernel: [drm:intel_psr_enable] PSR not supported by this panel
kernel: [drm:intel_edp_drrs_enable] Panel doesn't support DRRS
i.e. PC3 is the best I can achieve on native resolution. I'm not going to run at a reduced resolution finally, but will give it a try to see if it makes any difference.