ThinkPad T510 is using llvmpipe for graphics instead of Intel HD

Operating Systems & Open Source Linux
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1

Resolved
Figured out the cause. Turns out that Mesa 22 dropped support for legacy graphics hardware, which includes my ThinkPad T510’s 1st gen Intel Core.

Source

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My T510 was upgraded with a Intel Core i7-640M. I discovered that it’s using llvmpipe instead of Intel HD for graphics, and I don’t know why. I have everything related to Intel graphics & mesa installed on the system.

$ sudo lshw -c display
  *-display                 
       description: VGA compatible controller
       product: Core Processor Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       logical name: /dev/fb0
       version: 02
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom fb
       configuration: depth=32 driver=i915 latency=0 resolution=1600,2700
       resources: irq:27 memory:f2000000-f23fffff memory:d0000000-dfffffff ioport:1800(size=8) memory:c0000-dffff

$ DRI_PRIME=0 glxinfo | grep "OpenGL renderer"
OpenGL renderer string: llvmpipe (LLVM 13.0.1, 128 bits)

I tried both 5.15 & Liquorix’s 5.16 kernels, along with Mesa from the Ernst’s Mesarc PPA, but none worked. Funny thing, though, Mesa in Ubuntu repo wasn’t working properly (constant freezes), and necessitated me to add that PPA.

OS: Kubuntu 22.04