The USB persist feature allows devices that can retain their state when
powered down to work across suspend/resume. This is in particular useful
for USB drives.
However, the persist feature can get in the way for devices that are
unable to retain their state when power is lost. An example of such
stateful devices are fingerprint readers where USB persist should be
disabled to ensure userspace can detect whether the USB device had a
power loss during system suspend.
This will initially be used by the libfprint autosuspend hwdb.
Closes: #20754
Add the Sierra Wireless EM7345-LTE modem to the list of USB devices which
can safely autosuspend. This helps the processor reach deaper PC# states
when idle.
This was tested on a ThinkPad8 tablet with such a modem builtin.
This reverts commit c0443b97b7.
I got various cases wrong:
"usb:v04F3p2B7Cd5912dc00dsc00dp00ic03isc00ip00in00"
"usb:v0627p0001:QEMU USB Tablet"
"input:b0003v0627p0001e0001-e0,1,2,4,k110,111,112,r0,1,8,B,am4,lsfw"
OTOH:
-evdev:name:ETPS/2 Elantech Touchpad:dmi:*svnASUSTeKComputerInc.:pnN53SV:*
+evdev:name:ETPS/2 Elantech Touchpad:dmi:*svnASUSTeKComputerInc.:pnN53SV*
is OK. Other parts follow after 'pn'.
-mouse:*:name:*Trackball*:*
-mouse:*:name:*trackball*:*
-mouse:*:name:*TrackBall*:*
+mouse:*:name:*Trackball*:
+mouse:*:name:*trackball*:
+mouse:*:name:*TrackBall*:
... and anything else with :name should be OK too, because our imports always
include ":" at the end:
IMPORT{builtin}="hwdb 'joystick:$env{ID_BUS}:v$attr{id/vendor}p$attr{id/product}:name:$attr{name}:'"
Including '*' at the end makes the pattern work even if we decide to add
something to the match string later.
Fixes#17499.
No functional change is intended.
The general pattern of changes:
-usb:v04F3p2B7C*
+usb:v04F3p2B7C:*
This is mostly a clarification, to make the part that makes the usb vXXXXpYYYY
part visually separated. It would only make a difference if we added further
keys with a different number of digits, which is unlikely.
-usb:v0627p0001:*QEMU USB Keyboard*
-usb:v0627p0001:*QEMU USB Mouse*
-usb:v0627p0001:*QEMU USB Tablet*
+usb:v0627p0001:*QEMU USB Keyboard*:*
+usb:v0627p0001:*QEMU USB Mouse*:*
+usb:v0627p0001:*QEMU USB Tablet*:*
Again, only a clarification. We know that ":" will appear somewhere later in
the match key, so anything that matches "…Keyboard*" will also match "…Keyboard*:*".
-evdev:name:ETPS/2 Elantech Touchpad:dmi:*svnASUSTeKComputerInc.:pnN53SV*
+evdev:name:ETPS/2 Elantech Touchpad:dmi:*svnASUSTeKComputerInc.:pnN53SV:*
This makes the match narrower. Previously we would match product "N53SV"
and "N53SV2", "N53SV3", and others. Here we are saying that the ':pn' part must
match exactly. Most of the changes in this patch match this pattern. I made a few
judgement calls and used "pn…*:*" when I wasn't sure if the full pn is included:
-evdev:name:Dell WMI hotkeys:dmi:bvn*:bvr*:bd*:svnDell*:pnPrecision*
+evdev:name:Dell WMI hotkeys:dmi:bvn*:bvr*:bd*:svnDell*:pnPrecision*:*
-evdev:name:Cypress APA Trackpad ?cyapa?:dmi:*:svnHewlett-Packard*:pnFalco*:
+evdev:name:Cypress APA Trackpad ?cyapa?:dmi:*:svnHewlett-Packard*:pnFalco*:*
This more like the "QEMU" example above, since all dmi strings end in ":", so
anything which matches the old version will also match the new version.
-evdev:atkbd:dmi:bvn*:bvr*:bd*:svnGateway*:pnA0A1*:pvr*
+evdev:atkbd:dmi:bvn*:bvr*:bd*:svnGateway*:pnA0A1*:*
I replaced trailing ":pvr*" by ":*". This makes no functional difference because
we expect "pvr" to always appear in the dmi string. This makes patterns shorter.
-evdev:atkbd:dmi:bvn*:bvr*:bd*:svnAcer*:pn*
+evdev:atkbd:dmi:bvn*:bvr*:bd*:svnAcer*:pn*:*
OTOH, ":pn*" is kept. This is because almost patterns include ":pn*", and if we
skip it, we should make it clear that this is on purpose, that we really want to
match any product name.
The python script to generate autosuspend rules is updated to use ":*" too.
Inspired by https://github.com/systemd/systemd/pull/17281#discussion_r501489750.
This effectively partially reverts "rules: remove all power management from
udev" / e2452eef02. The rules for emulated QEMU
hardware were removed in one fell swoop with other rules which were causing
problems. But the qemu rules were working properly (and were adjusted through
patches over time). Nowadays we have a hwdb for this, so add hwdb entries using
the new detailed modalias.
https://github.com/systemd/systemd/pull/353#issuecomment-658810289
