It seems there might be a race condition. In my case, if I restart the
laptop enough times with the new libpciaccess, it will boot to a
desktop.
Downgrading libpciaccess with `sudo apt install libpciaccess-
dev=0.17-3build1 libpciaccess0=0.17-3build1
libpciaccess0:i386=0.17-3build1` (and then pinning it) resolves the
issue.
This is on a device with Intel + Radeon. After a successful boot to the
desktop, the following is true for the Intel card, which is the one
driving the displays:
cat /sys/devices/pci0000:00/0000:00:02.0/firmware_node/hid
LNXVIDEO
Relevant lspci snippet:
00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT
Integrated Graphics Controller [8086:0a16] (rev 09) (prog-if 00 [VGA
controller])
Subsystem: Acer Incorporated [ALI] Haswell-ULT Integrated Graphics
Controller [1025:0775]
Kernel driver in use: i915
03:00.0 Display controller [0380]: Advanced Micro Devices, Inc. [AMD/ATI] Mars
[Radeon HD 8670A/8670M/8750M / R7 M370] [1002:6600]
Subsystem: Acer Incorporated [ALI] Mars [Radeon HD 8670A/8670M/8750M /
R7 M370] [1025:0776]
Kernel driver in use: amdgpu
Attached are Xorg logs of a successful and a failed boot. On the failed
boot, it appears that it completely ignores card0.
** Attachment added: "Xorg.0.log"
https://bugs.launchpad.net/ubuntu/+source/libpciaccess/+bug/2115574/+attachment/5887057/+files/Xorg.0.log
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https://bugs.launchpad.net/bugs/2115574
Title:
Upgrade of libpciaccess0 to 0.17-3ubuntu0.25.04.1 causes black screen
on boot with AMD Radeon GPU
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