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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1973676
Title:
flickering and black screen after grub after 22.04 upgrade
Status in linux package in Ubuntu:
Incomplete
Bug description:
On an HP x360 Spectre (i7-8565U WhiskeyLake-U GT2 [UHD Graphics 620]), after
upgrading from 21.10 to 22.04, at boot time just after grub, the kernel
displays some errors messages then goes to black.
I configure my machine with an encrypted filesystem and before it was going
to the splash screen and asking for the partition password.
If I type in the password, it seems to boot but the screen stays black
forever.
It seems the bug started with the 5.15.x series. I have been able, using
"mainline" to update up to 5.14.21. After this version the problem appears.
Before it's fine.
I found the following errors in the logs:
* i915 0000:00:02.0: [drm] *ERROR* Atomic update failure on pipe A
(start=43426 end=43427) time 300 us, min 2146, max 2159, scanline start 2131,
end 2171
* i915 0000:00:02.0: [drm] Finished loading DMC firmware
i915/kbl_dmc_ver1_04.bin (v1.4)
* i915 0000:00:02.0: [drm] [ENCODER:102:DDI B/PHY B] is disabled/in DSI mode
with an ungated DDI clock, gate it
* i915 0000:00:02.0: [drm] [ENCODER:113:DDI C/PHY C] is disabled/in DSI mode
with an ungated DDI clock, gate it
* i915 0000:00:02.0: [drm] *ERROR* CPU pipe A FIFO underrun
So the problem is > 5.13.x series
It might be related to
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1958191
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