[bugzilla reporter bcc'd] Bisected to https://git.kernel.org/linus/7afeb84d14ea I'll take a look; including linux-pci for completeness and in case others are interested. On Sun, Apr 06, 2025 at 03:11:54PM +0000, bugzilla-daemon@xxxxxxxxxx wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=219984 > > Bug ID: 219984 > Summary: [BISECTED] High power usage since 'PCI/ASPM: Correct > LTR_L1.2_THRESHOLD computation' > Reporter: sergey.v.dolgov@xxxxxxxxx > Regression: No > > Created attachment 307924 > --> https://bugzilla.kernel.org/attachment.cgi?id=307924&action=edit > Bisection log > > I have been observing increased power consumption on my HP Spectre x360 > Convertible 15-df1xxx (CoffeeLake) since kernel 6.1. Bisection revealed a > regression in commit 7afeb84d14eaaebb71f5c558ed57ca858e4304e7 (PCI/ASPM: > Correct LTR_L1.2_THRESHOLD computation). This still affects the mainline. > > With the original kernel 6.14, turbostat shows that the CPU sticks to Pkg%pc3 > more than 50% of the time, resulting in a discharge rate of 3.52 W reported by > powertop during an idle empty plasma6 session with screen off. > > After reverting 7afeb84d14eaaebb71f5c558ed57ca858e4304e7 and recompiling the > kernel with the same config, Pk%pc10, CPU%LPI and SYS%LPI residencies are all > above 80% during the same session, and "The battery reports a discharge rate of > 1.35 W." > > The two kernels above had no nvidia drivers to avoid tainting. However, > compiling also the proprietary nvidia modules reduces the idle power > consumption further to 796 mW. > > Could you please revert 7afeb84d14eaaebb71f5c558ed57ca858e4304e7 upstream? Or, > at least, to switch between the two encode_l12_threshold algorithms selectively > depending on the system.
