Tested Ubuntu 20.04 (kernel 5.4.0-52-generic) with the old HP Pavilion
dv6 laptop and the bug seems to still exist.
Disabling the Plymouth boot screen fixes this bug (changing
GRUB_CMDLINE_LINUX_DEFAULT from "quiet splash" to "quiet" in
/etc/default/grub).
Also closing and opening the laptop lid
I can confirm that the workaround works.
Suspending with "sudo pm-suspend --quirk-test --quirk-s3-bios" makes the
computer resume normally with fully working display.
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Model is: HP Pavilion dv6-6145eo
Product is: QC641EA
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https://bugs.launchpad.net/bugs/1313804
Title:
Laptop display does not turn back on after resuming from suspend on HP
I tested Ubuntu 13.10 and it does NOT have this bug.
Ubuntu 14.04 and 14.10 both have this bug, so it broke somewhere between 13.10
and 14.04
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https://bugs.launchpad.net/bugs
Public bug reported:
When booting HP Pavilion dv6-6145eo with Ubuntu 15.04 the laptop monitor
turns off in the middle of the boot.
If I suspend and resume the computer (close and open the lid) when I
hear the login sound the monitor turns back on and the computers works
just fine.
ProblemType: B
** Tags added: kernel-fixed-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1481442
Title:
[HP Pavilion dv6-
Tested 4.2 rc5 and it fixes this bug.
The laptop previously had 14.04 which did not have this bug. Also the 15.04
live CD did not have this bug.
It appeared only after installing updates.
It seems that this bug is duplicate of #1472794.
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Tested with the daily image (Ubuntu 15.10 with kernel 4.2.0-7-generic) and the
bug still exists.
This is odd since installing 4.2 kernel to 15.04 fixed this bug.
The bug also does not appear when booting from a live USB -stick only when
installing to the hard drive.
I still think that this bug
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