update arch notes page (hashcat using CPU)

content/notes/archlinux/index.md

@@ -1,7 +1,7 @@
 ---
 title: Archlinux
 date: 2023-11-29T20:33:48+0100
-lastmod: 2024-09-09T18:33:54+0000
+lastmod: 2024-09-14T09:53:25+0000
 tags:
   - archlinux
   - systemd
@@ -120,6 +120,100 @@ wifi.backend=iwd
 dhcp=dhcpcd
 ~~~
 
+## Using the CPU with hashcat
+
+~~~console
+$ hashcat -I
+hashcat (v6.2.6) starting in backend information mode
+
+OpenCL Info:
+============
+
+OpenCL Platform ID #1
+  Vendor..: Intel(R) Corporation
+  Name....: Intel(R) OpenCL Graphics
+  Version.: OpenCL 3.0
+
+  Backend Device ID #1
+    Type...........: GPU
+    Vendor.ID......: 8
+    Vendor.........: Intel(R) Corporation
+    Name...........: Intel(R) UHD Graphics 620
+    Version........: OpenCL 3.0 NEO
+    Processor(s)...: 24
+    Clock..........: 1150
+    Memory.Total...: 14368 MB (limited to 2047 MB allocatable in one block)
+    Memory.Free....: 7136 MB
+    Local.Memory...: 64 KB
+    OpenCL.Version.: OpenCL C 1.2
+    Driver.Version.: 24.31.30508
+~~~
+
+This is what I've seen on `hashcat -I` for a long time now but I never dig myself
+into this "problem" -- but today I tried to find the reason why there is no CPU
+listed on my Carbon X1 Gen7 laptop.
+
+After a few minutes doing some trial & error I finally got the CPU listed after
+installing _pocl_.
+
+~~~console
+$ paru -S pocl
+~~~
+
+Or, on my gaming laptop running a cheap clone of Ubuntu:
+
+~~~console
+$ sudo apt install pocl-opencl-icd
+~~~
+
+Now my `hashcat -I` looks like this:
+
+~~~console
+$ hashcat -I                                                                                                                                        took 6s
+hashcat (v6.2.6) starting in backend information mode
+
+OpenCL Info:
+============
+
+OpenCL Platform ID #1
+  Vendor..: Intel(R) Corporation
+  Name....: Intel(R) OpenCL Graphics
+  Version.: OpenCL 3.0
+
+  Backend Device ID #1
+    Type...........: GPU
+    Vendor.ID......: 8
+    Vendor.........: Intel(R) Corporation
+    Name...........: Intel(R) UHD Graphics 620
+    Version........: OpenCL 3.0 NEO
+    Processor(s)...: 24
+    Clock..........: 1150
+    Memory.Total...: 14368 MB (limited to 2047 MB allocatable in one block)
+    Memory.Free....: 7136 MB
+    Local.Memory...: 64 KB
+    OpenCL.Version.: OpenCL C 1.2
+    Driver.Version.: 24.31.30508
+
+OpenCL Platform ID #2
+  Vendor..: The pocl project
+  Name....: Portable Computing Language
+  Version.: OpenCL 3.0 PoCL 6.0  Linux, Release, RELOC, LLVM 18.1.8, SLEEF, DISTRO, POCL_DEBUG
+
+  Backend Device ID #2
+    Type...........: CPU
+    Vendor.ID......: 128
+    Vendor.........: GenuineIntel
+    Name...........: cpu-haswell-Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz
+    Version........: OpenCL 3.0 PoCL HSTR: cpu-x86_64-pc-linux-gnu-haswell
+    Processor(s)...: 8
+    Clock..........: 4800
+    Memory.Total...: 13716 MB (limited to 2048 MB allocatable in one block)
+    Memory.Free....: 6826 MB
+    Local.Memory...: 256 KB
+    OpenCL.Version.: OpenCL C 1.2 PoCL
+    Driver.Version.: 6.0
+~~~
+
 ## Paru / Pacman
 
 Found on [andreas-mausch.de](https://cheatsheets.andreas-mausch.de/paru) and