Oh actually I just noticed that test kernel doesn't change or defer the
time at which I see:
fb0: switching to inteldrmfb from EFI VGA
It's still around 2.5s regardless, even with the eoan kernel.
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@Paolo, I think from a desktop perspective we do validate the enabling
of the option (even if that's not enough to fix the bug here) so please
move forward with that if you can
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Seb,
Yes I do see it but it's different now...
$ uname -a
Linux kab 5.3.0-19-generic #20~lp1836858 SMP Fri Oct 18 12:09:47 UTC 2019
x86_64 x86_64 x86_64 GNU/Linux
$ dmesg | grep fb
...
[0.395596] efifb: probing for efifb
[0.395604] efifb: showing boot graphics
[0.396347] efifb:
Daniel, do you still see the 'fb0: switching to inteldrmfb from EFI
VGA'? The kernel change is needed from what upstream said even if it
might not be enoguh for your problem so I think it should still be a
step in the right direction and we should enable the option
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Also keep in mind that the duration of the flicker here depends on the
model of monitor in use.
Some laptops/monitors might be super-fast and not black-out when the
programmed mode changes. But in my experience most will. Sometimes
quickly and sometimes slowly.
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$ uname -a
Linux kab 5.3.0-19-generic #20~lp1836858 SMP Fri Oct 18 12:09:47 UTC 2019
x86_64 x86_64 x86_64 GNU/Linux
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https://bugs.launchpad.net/bugs/1836858
Title:
i915: Display
I've discussed the issue with Hans who pointed out to that kernel option being
needed
FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
Details on https://lwn.net/Articles/758312/
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for me, it's flicker-free but it doesn't show the vendor logo, only the
spinner appears during boot.
But for the first boot, it worked fine
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https://bugs.launchpad.net/bugs/1836858
** Description changed:
I am trying flickerfree boot in 19.10 [1], but find it actually flickers
- part way through. The flicker occurs seemingly during kernel startup
- since my peripherals are lit up before the problem occurs.
+ part way through:
+
+ 1. BIOS logo on a black background.
+
** Summary changed:
- i915: Display flickers during "flickerfree" boot
+ i915: Display flickers during "flickerfree" boot (BIOS logo on a black
background)
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I've now found this occurs on an HP laptop, as well as a Lenovo desktop.
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https://bugs.launchpad.net/bugs/1836858
Title:
i915: Display flickers during "flickerfree" boot
To manage
** Attachment removed: "WifiSyslog.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1836858/+attachment/5277605/+files/WifiSyslog.txt
** Attachment removed: "CRDA.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1836858/+attachment/5277592/+files/CRDA.txt
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