Sorry I wasn't clear! Yes I realized that after Googling and switched to
i965 and it's fixed, I am just wondering if the package responsible for
choosing the default driver can add a check for older CPU model so that
this problem will not be encountered by other users. I think I should
probably file this to the installer or upgrader instead!

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  iris driver for old cpu

Status in mesa package in Ubuntu:

Bug description:
  I am not completely sure where I should file the bug. I am using
  Lubuntu 20.04 with lxqt, and since the upgrade to 20.04 iris is the
  default graphics driver, which results in crashes in multiple apps
  including guvcview and calibre. Setting
  MESA_LOADER_DRIVER_OVERRIDE=i965 fixed the problem. I am not sure but
  is it true that iris does not support older generations of Intel CPUs?
  If it is the case would it be possible to revert to i965 in those
  circumstances? Thanks!

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