Public bug reported:

Hardware BCM2835 is incorrect and model name is missing on arm64:

$ uname -a
Linux rpi-4b-rev1d2-2c1a 5.11.0-1003-raspi #3-Ubuntu SMP PREEMPT Thu Mar 4 
14:53:05 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux

$ cat /proc/cpuinfo | tail -15
CPU revision    : 3

processor       : 3
BogoMIPS        : 108.00
Features        : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd08
CPU revision    : 3

Hardware        : BCM2835
Revision        : c03112
Serial          : 10000000519d2c1a
Model           : Raspberry Pi 4 Model B Rev 1.2

Correct info on armhf:

$ uname -a
Linux rpi-4b-rev1d1-17cf 5.11.0-1003-raspi #3-Ubuntu SMP PREEMPT Thu Mar 4 
14:58:03 UTC 2021 armv7l armv7l armv7l GNU/Linux

$ cat /proc/cpuinfo | tail -15

processor       : 3
model name      : ARMv7 Processor rev 3 (v7l)
BogoMIPS        : 216.00
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt 
vfpd32 lpae evtstrm crc32 
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xd08
CPU revision    : 3

Hardware        : BCM2711
Revision        : c03111
Serial          : 100000003c2d17cf
Model           : Raspberry Pi 4 Model B Rev 1.1

** Affects: linux-raspi (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: linux-raspi (Ubuntu Hirsute)
     Importance: Undecided
         Status: Confirmed

** Also affects: linux-raspi (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

** Changed in: linux-raspi (Ubuntu Hirsute)
       Status: New => Confirmed

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Packages, which is subscribed to linux-raspi in Ubuntu.
https://bugs.launchpad.net/bugs/1919478

Title:
  Invalid /proc/cpuinfo on arm64

Status in linux-raspi package in Ubuntu:
  Confirmed
Status in linux-raspi source package in Hirsute:
  Confirmed

Bug description:
  Hardware BCM2835 is incorrect and model name is missing on arm64:

  $ uname -a
  Linux rpi-4b-rev1d2-2c1a 5.11.0-1003-raspi #3-Ubuntu SMP PREEMPT Thu Mar 4 
14:53:05 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux

  $ cat /proc/cpuinfo | tail -15
  CPU revision  : 3

  processor     : 3
  BogoMIPS      : 108.00
  Features      : fp asimd evtstrm crc32 cpuid
  CPU implementer       : 0x41
  CPU architecture: 8
  CPU variant   : 0x0
  CPU part      : 0xd08
  CPU revision  : 3

  Hardware      : BCM2835
  Revision      : c03112
  Serial                : 10000000519d2c1a
  Model         : Raspberry Pi 4 Model B Rev 1.2

  Correct info on armhf:

  $ uname -a
  Linux rpi-4b-rev1d1-17cf 5.11.0-1003-raspi #3-Ubuntu SMP PREEMPT Thu Mar 4 
14:58:03 UTC 2021 armv7l armv7l armv7l GNU/Linux

  $ cat /proc/cpuinfo | tail -15

  processor     : 3
  model name    : ARMv7 Processor rev 3 (v7l)
  BogoMIPS      : 216.00
  Features      : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt 
vfpd32 lpae evtstrm crc32 
  CPU implementer       : 0x41
  CPU architecture: 7
  CPU variant   : 0x0
  CPU part      : 0xd08
  CPU revision  : 3

  Hardware      : BCM2711
  Revision      : c03111
  Serial                : 100000003c2d17cf
  Model         : Raspberry Pi 4 Model B Rev 1.1

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