Baolu, On 1/5/2023 4:07 PM, Baolu Lu wrote: > On 2023/1/5 18:27, Vasant Hegde wrote: >> On 1/5/2023 6:39 AM, Matt Fagnani wrote: >>> I built 6.2-rc2 with the patch applied. The same black screen problem happened >>> with 6.2-rc2 with the patch. I tried to use early kdump with 6.2-rc2 with the >>> patch twice by panicking the kernel with sysrq+alt+c after the black screen >>> happened. The system rebooted after about 10-20 seconds both times, but no kdump >>> and dmesg files were saved in /var/crash. I'm attaching the lspci -vvv output as >>> requested. >>> >> Thanks for testing. As mentioned earlier I was not expecting this patch to fix >> the black screen issue. It should fix kernel warnings and IOMMU page fault >> related call traces. By any chance do you have the kernel boot logs? >> >> >> @Baolu, >> Looking into lspci output, it doesn't list ACS feature for Graphics card. So >> with your fix it didn't enable PASID and hence it failed to boot. > > So do you mind telling why does the PASID need to be enabled for the > graphic device? Or in another word, what does the graphic driver use the > PASID for? Honestly I don't know the complete details of how PASID works with graphics card. May be Alex or Joerg can explain it better. -Vasant
