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Bug#964839: Only the first PM_SUSPEND_PREPARE-event is missing

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Hi,

While using the new kernel with the mentioned workaround (i.e. enabling 
the graphics card manually before suspending), I've noticed something 
that might help to understand this issue better:

Only the first PM_SUSPEND_PREPARE-event is missing. When I get through 
the first suspend, all following suspends work as expected. See the 
following annotated excerpt from dmesg:

# Initial system boot
[   15.564193] bbswitch: version 0.8
[   15.564198] bbswitch: Found integrated VGA device 0000:00:02.0: 
\_SB_.PCI0.GFX0
[   15.564222] bbswitch: Found discrete VGA device 0000:01:00.0: 
\_SB_.PCI0.PEG0.PEGP
[   15.565812] bbswitch: detected an Optimus _DSM function
[   15.565820] bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 
is on
[   15.910080] bbswitch: disabling discrete graphics
# boot completed, I manually enable the graphics card
[   33.026943] bbswitch: enabling discrete graphics
# suspend, note the missing event type 3
[   44.663868] bbswitch: bbswitch_pm_handler: event_type=4 
is_card_disabled=0 dis_before_suspend_disabled=0
# wakeup from suspend completed, I manually disable the graphics card
[   49.237038] bbswitch: disabling discrete graphics
# now second suspend, the event type 3 is generated successfully, the 
graphics card is automatically disabled as expected
[   56.211317] bbswitch: bbswitch_pm_handler: event_type=3 
is_card_disabled=1 dis_before_suspend_disabled=0
[   56.211322] bbswitch: enabling discrete graphics
# wake up from second suspend, the graphics card is disabled as expected
[   64.060784] bbswitch: bbswitch_pm_handler: event_type=4 
is_card_disabled=0 dis_before_suspend_disabled=1
[   64.060786] bbswitch: disabling discrete graphics
# And just to demonstrate: activating and deactivating the graphics card 
now still works
[   65.428920] bbswitch: enabling discrete graphics
[   68.149054] bbswitch: disabling discrete graphics

Just for reference, I am using now kernel: 5.7.0-2-amd64 #1 SMP Debian 
5.7.10-1 (2020-07-26) x86_64 GNU/Linux

-- 
Kind regards,
Felix Dörre

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Bug#964839: Only the first PM_SUSPEND_PREPARE-event is missing Felix Dörre <felix@dogcraft.de> - 2020-08-16 11:20 +0200

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