Weird ACPI/DRM messages on -current

Thinkpad T430s:

11.0-CURRENT #15 r278283: Thu Feb  5 22:45:26 UTC 2015

Anybody know what this means ?

Feb  6 17:05:58 critter kernel: error: [drm:pid1090:gen6_sanitize_pm] *ERROR* Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS expected 19070000, was 19000000
Feb  6 17:06:12 critter kernel: error: [drm:pid1090:gen6_sanitize_pm] *ERROR* Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS expected 19070000, was 19000000
Feb  6 17:06:18 critter kernel: error: [drm:pid1090:gen6_sanitize_pm] *ERROR* Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS expected 19070000, was 19000000
Feb  6 17:06:27 critter kernel: error: [drm:pid1090:gen6_sanitize_pm] *ERROR* Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS expected 19070000, was 19000000
Feb  6 17:06:38 critter kernel: error: [drm:pid1090:gen6_sanitize_pm] *ERROR* Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS expected 19070000, was 19000000
Feb  6 17:07:15 critter kernel: error: [drm:pid1090:gen6_sanitize_pm] *ERROR* Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS expected 00070000, was 19070000
Feb  6 17:07:37 critter kernel: error: [drm:pid1090:gen6_sanitize_pm] *ERROR* Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS expected 19070000, was 00000000
Feb  6 17:07:50 critter kernel: error: [drm:pid1090:gen6_sanitize_pm] *ERROR* Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS expected 19070000, was 19000000
Feb  6 17:07:58 critter kernel: error: [drm:pid1090:gen6_sanitize_pm] *ERROR* Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS expected 19070000, was 19000000
Feb  6 17:08:12 critter kernel: error: [drm:pid1090:gen6_sanitize_pm] *ERROR* Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS expected 19070000, was 19000000


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