the test is radeon driver.
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https://bugs.launchpad.net/bugs/1858199
Title:
bugs in libvdpau_radeonsi.so and amdgpu(or radeon) driver freeze the
system
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today ,I test 5.3.24 generic kernel ,and use mpv vdpau and vaapi
hardware acceleration to play video ,the system don't freeze up to now
for a day .The problem seems only occur in lowlatency kernel .
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disable iommu or enable iommu by add "iommu=soft intel_iommu=off "
or "iommu=on intel_iommu=on" take the same result.But disable
intel_iommu it seems the graphical desktop response very smoothly.
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if you need furthure information and test I would like to provide.
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https://bugs.launchpad.net/bugs/1858199
Title:
bugs in libvdpau_radeonsi.so and amdgpu(or radeon) driver free
on kernel 4.15 serires I have some times sucessfully login to dump
the kernel error message by ssh when the system was frozen . the
attachment was the dmesg error message dump several weeks ago.
** Attachment added: "dmesg.error.tgz"
https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/
when enable radeon driver the kernel boot parameters is :
BOOT_IMAGE=/boot/vmlinuz-5.3.0-24-lowlatency
root=UUID=012b0ab8-e26f-4057-90c0-f4d52523776d ro security=tomoyo noquiet
TOMOYO_trigger=/lib/systemd/systemd nosplash scsi_mod.use_blk_mq=1 iommu=soft
intel_iommu=off vt.default_utf8=1
resume
controller: Advanced Micro Devices, Inc. [AMD/ATI]
Cape Verde PRO [Radeon HD 7750/8740 / R7 250E].
infomation from uname -a :
Linux smzhou-desktop 5.3.0-24-lowlatency #26~18.04.2-Ubuntu SMP PREEMPT Tue Nov
26 14:39:35 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
** Affects: mesa (Ubuntu)
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