Bug#990162: power consumption regression

From	John <johnbast@protonmail.com>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#990162: power consumption regression
Date	2021-06-27 22:50 +0200
Message-ID	<CuJT4-86W-5@gated-at.bofh.it> (permalink)
References	<Csyp3-u2-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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In order to attempt to prevent the i915 error, this command was used: aptitude -t unstable install firmware-misc-nonfree

This installed firmware-misc-nonfree_20210315-2_all.deb.
After rebooting, it seems to solve the i915 error. The power consumption (+25% compared to Debian 10.9) initially did not change because a single line message about the disk was still on screen, blocking blanking of the screen: dev/sda2: clean 5086/15177184 files, 1868566/60668160 blocks

This remains on screen after running e2fsck /dev/sda2 booted from the installer usb. No errors reported.

By using this workaround again:
echo 1 > /sys/devices/pci0000:00/0000:00:02.0/graphics/fb0/blank
 and then
echo > /sys/devices/pci0000:00/0000:00:02.0/graphics/fb0/blank

The screen blanked. The login prompt was displayed shortly before blanking at the second command. Using the keyboard to wake now works and it is possible to login.

After that, power consumption was reduced to +6% (down from +25%) above Debian 10 level.

package: linux-image-5.10.0-8-amd64
version: 5.10.46-1
package: firmware-misc-nonfree
version: 20210315-2

i915/kbl_dmc_ver1_04.bin is part of firmware-misc-nonfree 20210315-2
https://packages.debian.org/bullseye/firmware-linux-nonfree

Also tested with similar result:
package: firmware-misc-nonfree
version: 20210322-1~exp1

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Bug#990162: power consumption regression John <johnbast@protonmail.com> - 2021-06-27 22:50 +0200

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